I admit, it was tempting to test the current Radeon Pro W7800 as a gaming card, because AMD’s offerings between the already launched RX 7900 XT(X) and the RX 7600 are conspicuous by their noble absence on the market. At least the Radeon RX 7800XT has been ready for a long time, only that the chip is marketed as Radeon Pro W7800. Reason enough to simply test this object of curiosity as if it were a new gaming graphics card. That there were unexpected hurdles and problems, well. One should have actually known.
Important preface to the performance estimation
There are two things we need to clarify in advance. The first is how to interpret the power consumption. Since this is a workstation card, it is obviously designed for efficiency first and foremost. This means that it certainly operates closer to the sweet spot than the usual gaming behemoths. However, we can later extrapolate where the card would have ended up roughly via the efficiency comparison if AMD had turned on the tap significantly further here. We already have the values of the two NAVI31 cards, so this can be done very easily and plausibly. While the Radeon Pro W7800 has a TBP of 260 watts, my own extrapolation results in a TBP of around 270 watts for the RTX 7800XT based on the efficiency values of the other two NAVI31 cards. However, both values are not reached in gaming on average.
Since RDNA3 no longer allows us to emulate the cards directly, we unfortunately have to use the conversion method. I halve the memory with memtestcl . The program is able to allocate a predefined memory block and thus lock it completely for use by other programs. Thus, only 16 GB of VRAM is available. However, I can also confirm that it would not have made a difference and the advantage of 32 GB tends towards zero when gaming.
The second thing is almost a running gag, because what AMD delivers as a driver here is at least to be provided with a bigger question mark. Workstation or not, it works with NVIDIA, especially since I deliberately only use older games that don’t use any manufacturer-specific tricks. However, the fact that DXR is simply not applied in a game (although possible and enabled), but FSR works, is really weird, because then you even barely beat a GeForce RTX 4090 with DLSS. I still see the drivers as an endless construction site, so I really had to sort out and look very closely to remain plausible.
The AMD Radeon Pro W7800 and the hypothetical RX 7800XT
The Radeon PRO W7800 has been designed as a graphics card for professional users by AMD and was launched on April 13, 2023 It is manufactured in the 5-nanometer process and is based on the Navi 31 graphics processor in its specific design. This graphics card is compatible with DirectX 12 Ultimate, the latest generation of the DirectX interface. With a die area of 529 mm² and 57.7 billion transistors, the Navi 31 GPU is a large and powerful chip. Unlike the Radeon RX 7900 XTX, which uses the same GPU and has all 6144 shader units enabled, AMD has disabled some shader units on the Radeon PRO W7800 to achieve a specific shader count for this product.
As a result, the Radeon PRO W7800 only has 4480 shader units, 280 texture mapping units and 128 ROPs (Raster Operations Pipelines). Furthermore, 70 ray tracing acceleration cores are integrated. Up to this point, the data also exactly matches the colported RX 7800XT. After all, AMD has given the Pro card a full 32 GB of GDDR6 memory instead of 16 GB (clamshell), which are connected to the GPU via a 256 bit interface. The operating frequency of the GPUs is at a comparatively low 1855 MHz and can be clocked up to 2499 MHz if required, while the memory works at a speed of 2250 MHz (effective 18 Gbps).
As a pure dual-slot card in a blower design, it has dimensions of 280 mm x 110 mm x 40 mm. Furthermore, the AMD Radeon PRO W7800 draws its power from two rear 8-pin power connectors and has a maximum power consumption of 260 watts.
It offers various display ports, including 3x DisplayPort 2.1 and 1x Mini-DisplayPort 2.1, and connects to the rest of the system via a PCI-Express 4.0 x16 interface.
| RX 7900 XTX | RX 7900 XT | RX 7800XT |
|
| Compute units | 96 | 84 | 70 |
| AI accelerators | 192 | 168 | 128 |
| Ray tracing accelerators | 96 | 84 | 70 |
| Memory | 24 GB GDDR6 | 20 GB GDDR6 | 16 GB GDDR6 |
| Memory speed | 20 Gbps | 20 Gbps | 20 Gbps |
| Memory bus size | 384-bit | 320-bit | 245-bit |
| Game clock speed | 2.3 GHz | 2 GHz | tbc |
| Output | DisplayPort 2.1 | DisplayPort 2.1 | DisplayPort 2.1 |
| TBP | 355 W | 315 W | tbc |
| MSRP | 1000 USD | 900 USD | tbc |
With this, the first page is done and we are slowly preparing for the test event.
- 1 - Introduction, technical data and background
- 2 - Test system in the igor'sLAB MIFCOM-PC
- 3 - Gaming performance Full-HD (1920 x 1080)
- 4 - Gaming performance QHD (2560 x 1440)
- 5 - Gaming performance UHD (3840 x 2160)
- 6 - Power consumption and load balancing
- 7 - Transients and PSU recommendation
- 8 - Summary and conclusion
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