RX 6800, 6800 XT and 6900 XT Repair Sydney

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Our Sydney repair bench diagnoses and repairs AMD Radeon RX 6800, RX 6800 XT and RX 6900 XT graphics cards, and the later RX 6950 XT, down to component level: power stages, GDDR6 memory, firmware, connectors and thermal faults. All four use the same Navi 21 GPU, so they share most faults and most of the tests that find them.

These cards are now several years old, so this page is plain about money as well as faults: a cracked or shorted GPU die is not worth fixing, and the diagnostic tells you if that is your card. Drop-off is near Castle Hill by arrangement, or use our mail-in graphics card repair service from anywhere in Australia.

Request an RX 6800 or 6900 XT repair assessment

RX 6800, 6800 XT and 6900 XT Faults We Repair

Navi 21 faults sort into power, memory, firmware, heat and physical damage, plus one group that cannot be fixed: a failed GPU die. The table shows where diagnosis starts, not a verdict.

The last row is explained under cracked GPU die reports.

RX 6800 vs 6800 XT vs 6900 XT vs 6950 XT for Repair

All four cards use AMD's Navi 21 GPU with 16GB of GDDR6 on a 256-bit bus and 128MB of Infinity Cache; they differ in how much of the GPU is enabled, memory speed and power rating. AMD's own specifications (all four reference cards use two 8-pin inputs):

How that plays out on the bench:

• One diagnostic approach for all four: the same rails, memory arrangement and failure modes, whatever the badge.
• Firmware is not shared: each model and partner board has its own BIOS, and a recovery uses the image for that exact card.
• The 6950 XT's memory is faster: its 18 Gbps chips differ from the 16 Gbps parts on the other three, so replacements are matched to the board.
• More power, more strain. The 6950 XT is rated 35W above the 6900 XT, which loads its power stages and connectors harder.

Navi 21 Memory: 16GB GDDR6 and 128MB Infinity Cache

A Navi 21 card has eight 2GB GDDR6 chips around the GPU, each on its own 32-bit channel, and a 128MB Infinity Cache built into the GPU die itself; the chips can be replaced, the cache cannot. This split decides what is repairable when a card shows memory errors.

• Eight chips, front side only. Igor's Lab's teardown of AMD's reference RX 6800 and 6800 XT found eight Samsung 2GB GDDR6 modules rated at 16 Gbps. Eight chips on a 256-bit bus means one chip per 32-bit channel, with no second layer of chips on the back of the board.
• Each channel points to one chip. Memory testing that shows errors on one channel leads to a single chip, which keeps a genuine memory fault quick to locate.
• The Infinity Cache is on the die. AMD describes it as on-die cache, 128MB in two 64MB sets, so a cache fault is a GPU fault and cannot be fixed at board level.
• Rear cooling is simpler. With no memory on the back, the backplate matters less; Igor's Lab described the reference backplate as purely cosmetic.

Cracked Navi 21 GPU Dies: What Was Reported

A German repair shop in early 2023 and a Chinese graphics card brand in late 2025 reported Navi 21 cards with physically cracked GPU dies; a cracked die cannot be repaired economically, and no reball or reflow can fix one. What was reported, and by whom:

What was suspected, and what is still unknown:

• The driver was blamed first. The cards KrisFix received had run AMD's Adrenalin 22.11.2 driver, so attention fell on it. KrisFix later said a driver could not do damage like this.
• Mining and damp storage were the next theory. KrisFix suggested the cards had been used for crypto mining, then stored for weeks or months in poor conditions and humidity, and cracked once they were heated hard again. Tom's Hardware called mining and high-humidity storage "the likely culprits"; it remained a theory from one shop's batch of cards.
• No confirmed cause, no failure rate. Zephyr gave no cause for the cards it replaced, and none of the coverage we found included a statement from AMD. Reports from businesses that see broken cards do not show how many working cards are at risk.

Why a cracked die is the end of the road:

• The crack is in the silicon. A reflow or reball only remakes the solder joints under the GPU package, so it cannot mend a die.
• The only fix is a replacement GPU. According to KrisFix, AMD does not sell spare GPUs to repair shops, so it would come from a donor card of unknown history, at a cost near or above a working used card.
• A cracked die can short one of the GPU's own rails, which looks like a failed power stage from outside. The diagnostic isolates the short before anything is quoted.

If diagnosis finds a cracked or shorted die, you are told plainly, with photos where the crack is visible, and pay only the $150 diagnostic and any return postage. A card still under warranty should go to the retailer instead.

Software or Hardware? AMD Checks Before You Send a Card

Driver timeouts and black screens on a Radeon card are often software or tuning, so do three free checks at home before paying for a diagnostic. A fault that survives all three and follows the card to another PC is very likely hardware.

1. Reset any tuning. An overclock or undervolt in AMD Software that was once stable can stop being stable as a card ages. Return it to default and retest.
2. Remove the driver properly. AMD's own Cleanup Utility removes AMD graphics drivers and software; AMD recommends running it in Windows safe mode, and it makes a restore point first. Then install the current AMD Software: Adrenalin Edition.
3. Swap computers. Try the card in another PC, or another card in yours.

What the Windows and AMD messages mean:

• "AMD Software has detected a driver timeout": Windows reset the card because it stopped responding (timeout detection and recovery). One-off timeouts usually come from software or tuning; repeated ones at stock settings after a clean install point to memory, heat or power on the card.
• Whole PC switches off: usually the power supply or a short, not a driver. See power delivery.

RX 6800 and 6900 XT No Display Repair

A Navi 21 card with no display is repairable when the GPU die is healthy; the job is to find out which rail is missing, and whether the GPU itself is the reason. Whether the PC can see the card narrows it down:

Spinning fans prove only that 12V reaches the fan circuit. The GPU needs several separate supplies to start, and any one missing leaves the screen dark.

Artefacting, Driver Timeouts and Black Screens

Artefacts on an RX 6800 or 6900 XT, such as coloured blocks, lines or flickering textures, usually trace to a GDDR6 chip, the memory supply, or a joint under a chip or the GPU. When they appear matters more than how they look.

On the bench the memory is tested warm, because a marginal chip can pass a cold test. Errors on one channel point to that chip; errors everywhere point to the memory supply or the GPU. For more checks to try at home, see our GPU artefacting guide.

RX 6800 and 6900 XT GDDR6 Memory Repair

A failed GDDR6 chip on a Navi 21 card can be replaced from $530, subject to the correct chip being available. With eight chips, all on the front, the process is:

1. Memory testing at temperature identifies the failing channel, and so the chip.
2. The memory supply is measured first, so a good chip is not replaced to cure a power fault.
3. The chip is removed with controlled heat, the pads cleaned and a matching chip fitted: 16 Gbps for the RX 6800, 6800 XT and 6900 XT, 18 Gbps for the 6950 XT.
4. All eight chips are retested under load, and the memory pads under the cooler are renewed at the correct thickness.

Be realistic: on an RX 6800 or 6800 XT, a $530 memory repair can approach or pass what the card is worth working. The quote will say so (see is it worth repairing).

Power Stages and the Two 8-Pin Inputs

AMD rates Navi 21 cards at 250W to 335W, fed through 8-pin connectors and converted by a bank of smart power stages; a failed stage can be replaced from $430. On AMD's reference board, Igor's Lab found:

• One circuit board for the reference cards, with 10 core phases on the RX 6800 XT and 11 on the RX 6900 XT.
• Separate rails for the SOC (two phases), memory (two) and memory interface, VDDCI (one).
• Infineon TDA21472 smart power stages rated at 70A, one per phase.

Partner boards differ: Guru3D counted 13+3 phases on an MSI RX 6800 XT Gaming X Trio, and the Sapphire RX 6900 XT Toxic adds a 6-pin to its two 8-pin inputs, while MSI's RX 6950 XT Gaming X Trio uses three 8-pin. Parts are matched to the actual board. A melted 8-pin plug is replaced from $370, along with advice to replace the cable that fed it.

Not every shutdown is the card. Igor's Lab noted that Navi 21 load peaks lasting 1 to 10 ms can trip a power supply's protection even when average power is within its rating.

Shorted Rails: Power Stage or GPU?

With a shorted Navi 21 card, the key question is whether the short sits in a power stage or capacitor, which is repairable, or inside the GPU, which is not. Measurement answers it, not the symptom.

1. Each rail is measured to ground with the card unpowered: 12V input, core, SOC, memory and memory interface.
2. A shorted rail is fed a small current-limited supply under a thermal camera; the part that warms is taking the current.
3. If the warm part is a power stage or capacitor, it is changed and the rail brought up slowly before full power.
4. If the heat shows at the GPU, or the short stays after that rail's stages are lifted, it is in the die or package, and the card is not economical to repair.

The cards KrisFix reported had shorts on exactly these rails, which is why this step comes before any power-stage quote.

Hotspot Temperature and Thermal Service

A hotspot (junction) temperature that runs far above the GPU temperature points to the GPU's thermal interface or cooler contact, which a thermal service from $330 addresses. Tools such as HWiNFO show both readings, plus memory junction temperature.

• What to look for: a hotspot reading that pulls well away from the GPU reading under load, loud fans, and clocks that fall in long sessions.
• The reference cooler: in its review of the reference RX 6800 and 6800 XT, Igor's Lab described a large vapour chamber and a Hitachi phase-change pad on the GPU instead of paste. Once disturbed, that interface is renewed rather than refitted.
• The service: strip and clean, new GPU interface, pads at the measured thickness, and a logged load test.

With the cooler off, the die is also inspected under magnification, since nobody can see a crack through a heatsink.

AMD Reference and Partner RX 6800 and 6900 XT Cards

We repair the AMD reference design and partner cards from Sapphire, PowerColor, XFX, ASUS, Gigabyte, MSI, ASRock and others. Partner brands also sold the reference design, so the box does not always tell you which board you have.

On a card with a BIOS switch, try the other position after a failed firmware update before sending it. Otherwise firmware recovery starts from $330.

Ex-Mining RX 6800 and 6900 XT Cards

A second-hand Navi 21 card may have a crypto-mining past, so it deserves a proper check rather than an assumption. GPU mining on Ethereum ended with the Merge on 15 September 2022, and Tom's Hardware reported expectations of a flood of used RX 6000-series cards onto the second-hand market.

A hard-worked card can show dried thermal interface, flat pads, worn fan bearings and dusty fins. None of that proves damage, but it is why a thermal service is often the first job on a used card, and it is the background to the cracked-die theory above. If you buy one, run a long gaming load straight away and watch hotspot and memory temperatures while any return window is open.

How We Diagnose an RX 6800 or 6900 XT

Diagnosis runs from checks that cannot harm the card to invasive ones, and settles the most expensive question, whether the GPU die is sound, as early as possible.

1. Visual check, both sides: burn marks, cracked parts, liquid residue and earlier repairs.
2. Cold measurements: 12V input, core, SOC, memory and memory-interface rails measured to ground.
3. Current-limited start: a bench supply that cannot feed a fault enough current to spread damage.
4. Die inspection: where symptoms point to the GPU, the die is checked under magnification for cracks, chipped edges or lifting.
5. Firmware and memory: the BIOS read and compared with the correct image; all eight GDDR6 chips tested warm and cold.
6. Quote: what failed, a fixed price and our honest view of whether it is worth doing. Nothing proceeds without your approval.

RX 6800 and 6900 XT Faults That Are Not Worth Repairing

A cracked or internally shorted GPU die, a fault in the on-die Infinity Cache, or several faults on a cheaper card usually make repair uneconomical.

• Cracked, bulging or shorted die: the silicon cannot be repaired, and a replacement Navi 21 would have to come from a donor card.
• Infinity Cache or other faults inside the GPU: the cache is part of the die, so the same applies.
• Several memory chips plus a power fault: the total soon passes the card's value, especially on an RX 6800.
• Burnt-through board layers or heavy corrosion: rarely reliable on a card drawing 250W or more.
• Pads torn under a memory chip by a previous repair attempt.

If your card is in this group, you hear it after the diagnostic, and your only cost is the $150 diagnostic and any return postage.

RX 6800, 6800 XT and 6900 XT Repair Cost

Repairs start from $330 for thermal and firmware work, and every price is fixed in a written quote after diagnosis, before any work begins. Call 02 8428 9224 with your card model and the fault for a starting price.

Posted cards also carry postage both ways, at the service and cover you choose.

Is an RX 6800 XT or 6900 XT Still Worth Repairing?

Sometimes: the cheaper repairs usually are, but on cards this age memory and reball work often cost more than the card is worth. Compare any quote with recently sold listings for the same working model, not asking prices.

Usually worth it:

• A thermal service or firmware recovery.
• A melted 8-pin connector or a damaged output port.
• A single failed power stage on an otherwise healthy board.

Often not worth it:

• A memory chip from $530 on an RX 6800 or 6800 XT, unless working cards are fetching well above that near you.
• A reflow or reball from $630 on any of these cards, apart from unusual cases.
• Any repair on a card with a cracked or shorted die, because none is possible.

As an illustration: if working RX 6800 XTs are selling for around $500 near you, a $330 thermal service can make sense on a card you mean to keep, a $430 power stage is a close call against buying another working card, and a $530 memory chip usually costs more than the card is worth. A 6900 XT or 6950 XT may justify more than an RX 6800.

Still under warranty? Check your receipt. If it is, go to the retailer first: your consumer guarantee rights under the Australian Consumer Law sit with them.

RX 6800 and 6900 XT Repair Turnaround

Most Navi 21 jobs take between one and ten business days on the bench, depending on what failed.

If you are posting the card, allow for transit both ways. The Australia-wide GPU repair page lists Australia Post's estimates by state.

After the Repair: Testing and Warranty

No repaired Navi 21 card leaves the bench until it has passed a load test and every output works, and the invoice explains what was replaced and why. Testing covers:

• Normal detection, a clean driver install and every display output, including USB-C where fitted.
• A sustained load with GPU, hotspot and memory temperatures logged.
• After memory work, a full memory test with the card warm.

Once the invoice is paid, collect the card by arrangement, or we post it back using your prepaid label or add the return postage to the invoice at cost.

Warranty: parts we fit are covered for 12 months against the same fault; if one of them fails and the fault comes back inside that year, the part is covered. Running the card at stock settings for the first weeks makes a fault easier to tell from an unstable tune.

Typical RX 6800 XT Repair Scenarios

These are typical ways Navi 21 faults show up, what diagnosis tends to find and what happens next, including the cases where the honest answer is that no repair is possible. They describe fault patterns, not your card, which is quoted only after its own diagnosis.

RX 6800 and 6900 XT Repair in Sydney

Sydney owners can drop the card at our Hills District workshop near Castle Hill, by arrangement, Monday to Saturday from 8am to 6pm.

• Book first with the form below or by phone, for a likely cause, starting price, the address and a job number.
• Bring the card only, cooler fitted.
• Posting instead? Sydney cards can come by post at the same prices.

For other models and the faults all graphics cards share, see our main graphics card repair in Sydney page.

Interstate RX 6800 and 6900 XT Mail-In Repair

Navi 21 cards from every state and territory come by post to our Sydney repair bench, which is our only workshop.

1. Get a job number first, through the form below or by ringing 02 8428 9224. We send the workshop address with it.
2. Send the card alone with its cooler on, sealed in an anti-static bag and packed in a sturdy box with at least 5cm of padding all round, job number inside.
3. We confirm arrival, diagnose and send a fixed quote. Nothing is done without your approval.
4. Once repaired and tested, it is returned by your prepaid label, or return postage is added to the invoice at cost.

Postage both ways is yours to choose and pay for, including any cover. Packing guidance is on the mail-in GPU repair page, and the city pages give postage estimates: Melbourne, Brisbane, Perth, Adelaide, Canberra, Hobart and Darwin.

Frequently Asked Questions

Can an RX 6800 XT be repaired?

Usually, if the GPU die is sound. Failed power stages, GDDR6 chips, 8-pin connectors, output ports and corrupted firmware are all fixable on the board, on the RX 6800, 6900 XT and 6950 XT as well. A cracked or internally shorted die is not. The $150 diagnostic, waived if you approve the repair, finds out which applies.

Can a cracked Navi 21 GPU die be repaired?

No. The crack is in the silicon, and a reflow or reball only remakes the solder joints underneath it. The only fix would be a replacement GPU from a donor card, which costs about as much as a working used card or more. A cracked die costs you only the $150 diagnostic, plus return postage if the card was posted.

Did an AMD driver kill RX 6800 and 6900 XT cards?

That was the first suspicion in January 2023, when the German repair shop KrisFix reported a batch of dead Navi 21 cards, but KrisFix later said a driver could not cause that damage and suggested ex-mining cards stored in damp conditions. The cause was never confirmed, and the coverage we found carried no statement from AMD.

How much does an RX 6800 or 6900 XT repair cost?

Thermal service and firmware recovery start from $330, 8-pin connector and port repairs from $370, a power stage from $430, a GDDR6 chip from $530 (if the right chip can be sourced) and reflow or reball from $630. The $150 diagnostic is waived when you approve the repair. Call 02 8428 9224 with your card and fault for a starting price.

What warranty do you give on an RX 6800 or 6900 XT repair?

The parts we replace are covered for 12 months against the same fault. Should that fault come back within the year because one of those parts has failed, the part is covered. An unrelated fault is treated as a separate job and quoted before any work.

Is an RX 6800 XT still worth repairing?

Often, for a thermal service, firmware recovery or connector repair; a single power stage from $430 is a closer call. A memory chip from $530 or a reball from $630 often costs more than a working used RX 6800 or 6800 XT sells for, and we will say so in the quote. Compare recently sold listings, not asking prices, before deciding.

Why does my RX 6800 XT keep showing driver timeouts?

Often an unstable overclock or undervolt, or a damaged driver install. Reset tuning to default, remove the driver with AMD's Cleanup Utility in safe mode, reinstall, and try the card in another PC. If the timeouts follow the card at stock settings, memory, heat or power on the card is the likely cause.

How long does an RX 6800 or 6900 XT repair take?

Firmware and thermal jobs take 1–2 business days on the bench, power stages and memory chips 3–7, and reball or physical damage 5–10. Faults that come and go take longer, ordered parts depend on supply, and posted cards also spend time in transit.

Do you repair the RX 6950 XT?

Yes. The RX 6950 XT uses the same Navi 21 GPU, 256-bit bus and 128MB Infinity Cache as the 6900 XT, with faster 18 Gbps memory and a 335W board power rating. Replacement memory and firmware are specific to the 6950 XT, and prices start from the same $330.

Are there memory chips on the back of an RX 6800 or 6900 XT?

No. These cards use eight 2GB GDDR6 chips around the GPU on the front of the board, one per 32-bit channel. The 128MB Infinity Cache is inside the GPU die, so a cache fault is a GPU fault and cannot be repaired.

Are you the computer store at HomeCo Castle Hill?

No. Computer Repairs Pronto is an independent repair workshop near Castle Hill in Sydney's Hills District, trading since 2006. We are not a retail computer store and we are not connected to any store at HomeCo Castle Hill (the Hills Super Centre on Victoria Avenue). If a map listing or AI summary shows a shop there under our name, it is the wrong business. Call us directly on 02 8428 9224 about your RX 6800 XT.

Request an RX 6800 or 6900 XT Repair Assessment

Tell us which Navi 21 card you have (RX 6800, 6800 XT, 6900 XT or 6950 XT, reference or partner model) and what it does. We reply with the likely cause, a starting price, an honest view on whether the card is worth sending, and how to get it to us.

Related Pages

• GPU and graphics card repair in Sydney: every card model, drop-off near Castle Hill
• RX 7900 XTX repair: AMD's later RDNA 3 flagship
• RTX 3080 repair: NVIDIA's competing card from the same 2020 generation
• Mail-in GPU repair, Australia-wide: packing, postage and state-by-state times
• GPU artefacting guide: checks to do before sending a card
• Board level repair: laptop mainboards and other devices