Review: PCIe Resizable BAR Performance Radeon RX 6000 and GeForce RTX 3000 series benchmarks

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#5908852
https://forums.guru3d.com/data/avatars/m/282/282473.jpg
what a strange case 6800 is.I mean overall,not just in sam performance. 18% slower than 6800xt in legion,4% in cp2077
#5908853
https://forums.guru3d.com/data/avatars/m/198/198862.jpg
Beside vallhalla its not bringing a world of difference and in some cases games even run better with rbar off. It will be interesting if the trend continues with new gpus/cpus so every game sees benefit not only few.
#5908862
https://forums.guru3d.com/data/avatars/m/165/165018.jpg
once again Valhalla makes AMD look amazing. Those gains are quite impressive. Too bad no other game really benefit either manufacturer.
#5908868
https://forums.guru3d.com/data/avatars/m/283/283844.jpg
Thanks for the test, a lot of work and good job .I will leave rebar on my PC on.
#5908880
https://forums.guru3d.com/data/avatars/m/16/16662.jpg
Administrator
ViperAnaf:

now lets try it again without the biased AMD cpu...try it with 11900k
You're welcome to drop by and perform the 500 tests yourself 😉
#5908889
https://forums.guru3d.com/data/avatars/m/248/248994.jpg
Maybe there's something about the new console generation, based on the Zen architecture, that encouraged AMD to start experimenting with resizable bar on the PC side. Consoles have a unified memory for the APU, after all.
#5908893
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Kaarme:

Maybe there's something about the new console generation, based on the Zen architecture, that encouraged AMD to start experimenting with resizable bar on the PC side. Consoles have a unified memory for the APU, after all.
You are on to something.
#5908894
data/avatar/default/avatar33.webp
As expected, Watch Dogs Legion has stuttering associated with ReBar. It has been reported repeatedly since ReBar was released and it is again confirmed here. Even though Nvidia white-listed it, it should be turned off for Watch Dogs Legion.
#5908895
https://forums.guru3d.com/data/avatars/m/16/16662.jpg
Administrator
psychic717:

Watch Dogs Legion has stuttering associated with ReBar. It has been reported repeatedly since ReBar was released and it is again confirmed here.
Ah yes, that would definitely confirm what we're seeing in the frametime plots.
#5908899
https://forums.guru3d.com/data/avatars/m/55/55855.jpg
lol
#5908922
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ViperAnaf:

now lets try it again without the biased AMD cpu...try it with 11900k
And please enlighten us how this CPU is biased ?
#5908924
https://forums.guru3d.com/data/avatars/m/249/249528.jpg
kapu:

And please enlighten us how this CPU is biased ?
He probably doesn't like the fact that it has twice the cores and uses less power. It's quite unrealistic in the world of intel, therefore - use something realistic.
#5908939
https://forums.guru3d.com/data/avatars/m/225/225084.jpg
The 1080p results look promising for nVidia but soon as you up it to 1440p or 4K then the results are within testing variances. It's seems nVidia are better at 1080p but AMD get better results at 1440p/4K. Like people have already said, this method isn't anything new but still there could be future updates/patches that help make Re-bar work much better.
#5908945
https://forums.guru3d.com/data/avatars/m/224/224952.jpg
Reddoguk:

The 1080p results look promising for nVidia but soon as you up it to 1440p or 4K then the results are within testing variances. It's seems nVidia are better at 1080p but AMD get better results at 1440p/4K. Like people have already said, this method isn't anything new but still there could be future updates/patches that help make Re-bar work much better.
Yeah, I'm not going there for some time. My current experience is great at slightly lower res than UHD (with 3090 + 10700K) and its gonna be a right pita getting my hard drives/SSDs off CSM, plus all the updates required for REBAR. I'll wait until I encounter a problem it will fix.
#5908963
https://forums.guru3d.com/data/avatars/m/246/246171.jpg
kapu:

And please enlighten us how this CPU is biased ?
The PCIe 4.0 implementation could have an effect, though personally I highly doubt it.
#5908971
https://forums.guru3d.com/data/avatars/m/16/16662.jpg
Administrator
kanenas:

nice job as always Don if you do not bother can you add the 4k results for AMD cards in AC Valhala?
Ah, I somehow did not insert them, Added !
#5908972
https://forums.guru3d.com/data/avatars/m/282/282473.jpg
ViperAnaf:

now lets try it again without the biased AMD cpu...try it with 11900k
I don't know if using intel or amd makes any difference,but will your face be red when it turns out it doesn't.
#5908973
https://forums.guru3d.com/data/avatars/m/278/278016.jpg
cucaulay malkin:

I don't know if using intel or amd makes any difference,but will your face be red when it turns out it doesn't.
#5909002
https://forums.guru3d.com/data/avatars/m/54/54823.jpg
framebuffer not large enough to justify SAM before now. plus AMD looking to get any edge over nvidia. memory bandwidth also being a factor, now that we are smashing through 1TB/sec.

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