Anyone who'd like to comment on the (VaM-)merits of the 7900XTX relative to Nvidia 50xx? Headset will likely be a Quest3S, Desktop is WQHD.
* Would 24Gb Vram make a difference in VaM, compared to, say 20Gb (or 16)
* I could get an action price of ~900€ right now - pretty attractive relative to the current "moon-prices" of Nvidia's 50xx cards.
* For VaM, only Rasterization performance seems important - and the XTX looks pretty competitive in that regard?
Thoughts?
(I'm budget-limited to 1.900€ - 2.000€ for the whole system upgrade. Reusing my current nvme and PSU, I could just about manage a Zen 7 9800X3D +7900XTX combo )
Its a bit complicated question, but my short recommendation would be go for it.
Longer explanation:
pros:
- hell of a lot performance
- reliable trustworthy pcie 8pin connectors (its a joke that in 2025 it is a pro, but it is..)
- 24gb is plenty, yor dont have to afraid throwing anything on your scene, plus holds up will even with memory leak..
- price!
- with some finicking usually many AI stuff can be handled by them already
cons:
- vam benchmarks seems to show a 15-20% more performance on similar grade nv cards
- it seems amd favors udna architecture so rdna cards will likely get less and less of the new features..
- less efficient power handling
- AI stuff is less supported on amd cards
(- worse VR support then NV)
I have a 4090 now, but I used a 6800XT before. In my experience you can set your scene to your visual performance and the limiting factor will most likely be your cpu (I use a 5800x3d). The rdna2 was fine between fhd and qhd pixel count. For VR I am using a Q3 via virtual desktop. AMD handled that just fine. With the same settings in VR the 4090 is cpu limited. I just needed to adjust my settings and upped the resolution a bit (vam has even a built in slider for it).
The 4090 overall stomps the 6800XT, but eats significantly more also. It think the 7900XTX would be somewhere in the middle. You will get great performance at a reasonable price.
