BabelTechReviews review of the 7900XTX in VR

[Voyager]

Hellhound RX 7900 XTX Takes on the RTX 4080
https://babeltechreviews.com/hellhound-rx-7900-xtx-vs-rtx-4080-50-games-vr/5/?amp

 

Short answer seems to be, it's a 4080 in standard screen/raster, but significantly behind the 4080 in VR in almost all games tested. 

 

I do need to check his RDNA2 VR review to see where it stacks up against the last gen stuff, but unfortunately it looks like something is very not right with RDNA3 in VR at launch. 

 

Hopefully AMD can track to problems down and solve them, but for now, it looks like waiting is best. 

[354thFG_Drewm3i-VR]

Anybody try it in IL2 yet?

[Voyager]

On 12/16/2022 at 1:56 AM, drewm3i-VR said:

Anybody try it in IL2 yet?

Not that I've seen yet. I gather the DCS folks are having solid results in non-VR mode, but that engine has generally played well with RDNA cards. 

 

Given that most of the RDNA3 stock seems to be the 7900 XT instead of the XTX, and the impending Chinese New Year and driver push, I don't think it's likely we'll see one until February. 

 

That said, we may see the 3Ghz cards come in that push. 

[simfan2015]

Don't worry, AMD fans are propably already anticipating ... RDNA4 and, again, predicting the 'inevitable' demise of the leather jacket. 

I have always been in the Green camp though, but that new horror-plug made we wait till I am sure my house won't catch fire overnight!? 

 

[AngleOff66]

For those who have not seen the video, here you go.  The 4080 & the 7900 XTX look to be fairly evenly matched.  Do I think AMD has to do better? Yes. They should get their VR drivers in order if that is the issue. They could have made some inroads on Nvidia market share. As well, I think the latest cards from both companies are over priced.

Edit: the systems used aren't exact matches, but fairly close from what I remember.

 

Edited December 18, 2022 by AngleOff66

[Voyager]

On 12/18/2022 at 12:20 PM, simfan2015 said:

Don't worry, AMD fans are propably already anticipating ... RDNA4 and, again, predicting the 'inevitable' demise of the leather jacket. 

I have always been in the Green camp though, but that new horror-plug made we wait till I am sure my house won't catch fire overnight!? 

 

Just make sure it's plugged in all the way. The lock isn't great, and currert concensus seems to be that the problem is it's getting slightly tilted and conducting through a part that it shouldn't.

 

The thing about the XTX is, despite the marketing getting over its skiis, its still beating a 4080 on much cheaper silicon. Further, it's sounding like the driver issue may be in handling the new compute architecture rather than the memory controller interface.

 

NVidia cannot simply ignore that unless they want to end up in the spot Intel is in right now, and given they don't seem to have any chiplette development going at all, it's going to be an interesting set of generations. 

 

Current speculation is that Blackwell will be a 4090 repeat, just with an 800 mm^2 of TSMC 3nm, which should be a pretty monster card, but with TSMC capping the 2nm node at 400mm^2 nVidia will need to have some sort of multi chip method going or they're going to have to try a Rocket Lake gambit. 

 

Going to be interesting times in video card development. 

[simfan2015]

Thank you voyager for this in deph take on the matter. 

But I did read that amd is having problems with its silicone and is still on stepping one of which it is claimed to have issues that firmware or drivers might not be able to solve. This, reportedly, is why even the 7900xtx is underperforming. 

Maybe if this is sorted out it will still 'crush' the 4080!??? 

I also believe that AMD has the better tech... at this time. But the nvidia engineers are no fools, as soon as they realise they need a similar chip tech they will probably follow in amd's footsteps! 

 

Edited December 20, 2022 by simfan2015

[Voyager]

7 hours ago, simfan2015 said:

Thank you voyager for this in deph take on the matter. 

But I did read that amd is having problems with its silicone and is still on stepping one of which it is claimed to have issues that firmware or drivers might not be able to solve. This, reportedly, is why even the 7900xtx is underperforming. 

Maybe if this is sorted out it will still 'crush' the 4080!??? 

I also believe that AMD has the better tech... at this time. But the nvidia engineers are no fools, as soon as they realise they need a similar chip tech they will probably follow in amd's footsteps! 

 

It turned out that is more from a misunderstanding of the hardware: 
https://www.thefpsreview.com/2022/12/18/amd-responds-to-non-working-shader-prefetch-hw-claims-and-says-that-the-experimental-feature-is-supported-but-not-intended-for-7900-xt-xtx-cards/

 

Basically, pre-fetch is working fine. What people were seeing was an experimental version that was loaded into the silicon as well.

 

The thing about the RDNA3 generation is they changed the shader modules from a single Int/Float type to a dual Float+Int/Float type like the 30 series uses. That's where a large chunk of the performance was supposed to come from, and where the rumors they'd doubled their shades count came from. If they numbered them the way nVidia does, they had. 

 

Based on the weird performance, it sort of sounds like they didn't get the logic for loading it fully working right out the gate. So sometimes it's acting like a 6900 XT with 60% more bandwidth, and sometimes it's filling all the float shaders and acting more like a 4090.

 

I suspect they were so focused on the new memory bus that the sander architecture driversay have gotten slipped to the back side. 

[simfan2015]

@Voyager. Thanks for that clarification.

But the 'fact' of the matter (according to all reviews I read that is) remains that with the AMD drivers, up to this day, the 4080 is delivering far better FPS in PC VR.

[AngleOff66]

Seems with amd you need to not use freesync for vr?

 

https://forum.dcs.world/topic/313273-rtx-4080-7900-xtxxt-benchmarks-dcs/?do=findComment&comment=5111795

 

Not perfect but better.

[Gravytrader]

On 12/16/2022 at 3:56 PM, drewm3i-VR said:

Anybody try it in IL2 yet?

 

XFX MERC 310  here, non overclocked yet just stock.

 

I'm running IL2 on high preset, shadows medium, 2xMSAA at 2880x2810, FSR 80% (2304x2248)

90fps almost all the time even in MP, saw it drop to 70-80 during operation overlord but overall its a dream now coming from a 1080GTX

 

Reprojection is truly broken and a stuttering mess, but i didn't buy this card to use it, couldn't stand the artifacting and motion sickness it caused me.

It did take a few weeks of testing and finding conflicts (It really doesnt like MSI afterburner), but overall very happy with my XTX +  G2 now.

 

 

[Superfly29r]

On 2/3/2023 at 2:06 AM, Gravytrader said:

 

XFX MERC 310  here, non overclocked yet just stock.

 

I'm running IL2 on high preset, shadows medium, 2xMSAA at 2880x2810, FSR 80% (2304x2248)

90fps almost all the time even in MP, saw it drop to 70-80 during operation overlord but overall its a dream now coming from a 1080GTX

 

Reprojection is truly broken and a stuttering mess, but i didn't buy this card to use it, couldn't stand the artifacting and motion sickness it caused me.

It did take a few weeks of testing and finding conflicts (It really doesnt like MSI afterburner), but overall very happy with my XTX +  G2 now.

 

 

From what your describing, that seems to be my experience with the 3090. I think AMD get a little too much flak for their VR performance. I "lost" my 3090 so not sure whether to go 4080 or the xtx as IL2 VR with a G2  is the main game that i want to be running smoothly.

[chiliwili69]

6 hours ago, Superfly29r said:

4080

I would go for the NVIDIA if you are interested mainly in IL-2 VR.

[FTC_ChilliBalls]

On 2/6/2023 at 9:29 AM, chiliwili69 said:

I would go for the NVIDIA if you are interested mainly in IL-2 VR.

Apparently the 4070TI sucks bad for VR due to the memory bus.

7900XT is sometimes at an even price point to the 4070TI at German online retailers,

which seems to me the better deal.

 

Though I'm not sure how well the 7000 series works with IL2 and VR

[chiliwili69]

13 hours ago, So_ein_Feuerball said:

Though I'm not sure how well the 7000 series works with IL2 and VR

 

I said that because there are a couple to tests of the new 7000 series GPUs in the SYN_Vander table

 

One of those did the 4K test and it was quite below other NVIDIA cards of similar price/performance (like 3080).

 

We need more tests of those cards to conclude something.

[FTC_ChilliBalls]

4 hours ago, chiliwili69 said:

I said that because there are a couple to tests of the new 7000 series GPUs in the SYN_Vander table

 

One of those did the 4K test and it was quite below other NVIDIA cards of similar price/performance (like 3080).

The 4K Test meaning on a Monitor or in VR?

 

Would be interesting if it performed similarly on lower resolutions as well.

[chiliwili69]

20 hours ago, So_ein_Feuerball said:

The 4K Test meaning on a Monitor or in VR?

 

The 4K tests is in monitor. The 7900XT performed 92 fps, and all other NVIDIA cards are well over 100 fps.

[FTC_ChilliBalls]

9 hours ago, chiliwili69 said:

 

The 4K tests is in monitor. The 7900XT performed 92 fps, and all other NVIDIA cards are well over 100 fps.

ah ok thx, so RDNA 3 seems to have the same kind of bottleneck RDNA2 seems to have with IL2.

[Picchio]

The "bottleneck" you mention should hopefully be driver-related. In any case, lower-than-expected VR performance is currently listed among the known issues.