RX 10800 XT vs RTX 5090 (and RTX 6090): what the leaks actually claim
AMD's rumored RX 10800 XT against the shipping RTX 5090 and the rumored RTX 6090: every leaked number, the arithmetic underneath it, and what would settle it.
Vlad Makarovreviewed and published
AMD has not announced a Radeon RX 10800 XT. There is no product page, no price, no launch date and no first-party benchmark, and the same is true of the "RX 10800 XTX" that keeps turning up in search queries, a name with no source behind it. The leak everyone is arguing about covers one card. That has not stopped the comparison from being made anyway: a rumored AMD flagship, a shipping Nvidia RTX 5090 and a rumored RTX 6090, ranked against each other in a table nobody owns hardware for. What follows keeps the three apart.
The naming trap: three names, one rumor
Traffic to this subject arrives under several spellings, and only one of them matches anything a leaker described. "RTX 10800 XT" is not a product and never will be under that name, because the 10800 number belongs to AMD's Radeon line and the RTX prefix belongs to Nvidia; the combination is a miscopy that has propagated through aggregator headlines. "RX 10800 XTX" is a plausible guess at an AMD halo tier with nothing published behind it. The rumor that started this is about a single part, the RX 10800 XT. An article presenting all three as separate products is working from a keyword list, not from a source, and its performance numbers should be read with that in mind.
The spec sheet, and the arithmetic underneath it
Two of these cards exist only as leaked specifications. Only one can be bought.
| RX 10800 XT (rumored) | RTX 5090 (shipping) | RTX 6090 (rumored) | |
|---|---|---|---|
| Shader cores | 12,800 ALUs (200 CUs x 64 SP) | 21,760 FP32 (170 of 192 SMs) | 24,576 FP32 (192 SMs) |
| Ray / tensor hardware | not specified in the leak | 170 RT, 680 Tensor | not specified in the leak |
| Memory | up to 48 GB GDDR7, 512-bit | 32 GB GDDR7 | 32 GB GDDR7 |
| Clocks | 3.1-3.4 GHz | not disclosed | not disclosed |
| Price | $2,000-$2,500 leaked | $1,999 MSRP | none |
The row that matters is the first one, and it runs the wrong way. Nvidia's RTX 5090 uses GB202 with 170 active streaming multiprocessors out of 192 physical, at 128 CUDA cores per SM. AMD's alleged 200 Compute Units, at 64 stream processors each, work out to 12,800 ALUs. That is fewer raw shader cores than the card it is supposed to beat, not more. The whole advantage case rests on extreme clocks, a chiplet design, a large Infinity Cache and a 512-bit GDDR7 bus carrying up to 48 GB. Those are real levers. They are also unmeasured ones.
Two percentages that never met
The headline number is 15-25%, and it comes with qualifiers that the headline drops.
| Version of the claim | Figure | Where it appears |
|---|---|---|
| 4K raster advantage over the RTX 5090 | 15-25% | GameGPU, Sep 19 |
| Advantage over the RTX 5090 | 30-60% | Sportskeeda, Sep 4 |
| Expected price | $1,000 to $2,500 | Sportskeeda, Sep 4 |
The 15-25% is measured against the RTX 5090, in traditional raster rendering at 4K, without ray tracing and without AI inference. Sportskeeda's 30-60% is attributed to "a report published on GameGPU." The only GameGPU article on the card that existed on September 4 was its August 22 piece, and it contains no percentage at all. Both figures, and both price ranges, trace to one Moore's Law is Dead video published on August 21. One leak, three incompatible numbers, and an AMD card that has not been announced.
What the 5090 actually costs
Set the leaked $2,000-$2,500 against the RTX 5090's $1,999 launch price and AMD's card stops looking like the value pick the leaks imply. It looks like a bargain only against the street price, and the street price is a supply story rather than a silicon one. The 5090 has left first-party retail in the US, with prices running from $4,399 to a $10,849.96 Newegg bundle and Tom's Hardware putting the third-party ceiling at $9,500 on September 14. A card that undercuts a shortage is not undercutting Nvidia. It is undercutting an allocation failure, and it will look expensive the moment that failure ends.
Where the 6090 changes the answer
GameGPU's own piece spends a paragraph dismantling its own headline. Against Nvidia's next flagship, the RTX 6090 on Rubin, the raster lead is negated and NVIDIA is put 15-20% ahead. The 192 active SMs and 24,576 shader cores attributed to Rubin are consistent with separately reported RTX 6090 leaks, which means the AMD card's window of advantage is the gap between two launch dates. Ray tracing is worse for AMD on the same account: rough parity in hybrid ray tracing, and a 35-50% deficit once path tracing is switched on. A raster-only lead that expires against the next generation is a claim about timing, not about engineering.
What would settle it
Three things would, and none of them is another leak. A retail launch with board partner models and an actual price. Third-party 4K reviews measuring raster and ray tracing on shipping silicon rather than on a compute-unit count. And local inference numbers produced on the card itself and published next to the software stack that produced them. Until those exist, the comparison the search queries are asking for cannot honestly be made: the silicon is plausible and unconfirmed, the percentage holds only in raster at 4K and only until Rubin arrives, and the price spans a bargain and a halo product. The earlier write-up on this rumor reaches the same place from the other direction.
