After the entry test of the Sapphire RX 6700 XT Nitro+, the second part of the series is here, tests with active Smart Access Memory. Immediately after the launch of the card, we would write about the performance that attacks the RTX 3070. In the meantime, all GeForce RTX 30 cards started to support Resizable BAR and the situation is changing a bit. ReBAR can no longer be ignored in Nvidia’s GPUs, but we don’t have to take it too seriously.
Conclusion
We have performed hundreds of comparative tests that give a clear picture of where active Resizable BAR takes the RX 6700 Nitro+. From a sample of 18 up-to-date games in FHD and QHD resolutions, you get an average of 9% fps boost. We’ve noticed significant performance boost in CS:GO – in FullHD up to 30 %. In UHD (4K) it’s ”only” 20% and for this resolution, we also have a remarkable intersection with power
draw, which has increased by 18.7 W, which represents a 9% increase. This means that with Resizable BAR, clearly higher efficiency is achieved here (performance per watt). Similarly, although not so significantly, it also applies to more challenging games F1 2020 and Shadow of The Tomb Raider.
In terms of modern AAA games, the most significant increase in performance is in Forza Horizon 4 (21–31 %), Borderlands 3 (7–14 %) or Assassin’s Creed: Valhalla (9–14 %), where it is always true that the higher percentage belongs to the lowest tested FHD resolution. At this point, we want to apologize to our readers for one misinformation from our previous test of the RX 6700 XT. Everything is fixed now, but at the end it was that in AC:V, the RX 6700 XT, for unclear reasons, significantly beat even more powerful cards. In the end, these results were incorrect, caused by the failure of the human factor and poor control of some tuned graphics settings after a game update. We therefore apologize once again for this error. Performance of the RX 6700 XT in Assassin’s Creed: Valhalla is 8 (FHD) to 17% (UHD) below the RX 6800.
We’ve also measured bonus fps in Battlefield V, but more than the fps without ray tracing (where the frame rate in the target resolution is still three-digit), results with RTX (DXR, Ultra) are more interesting. At values around 50 fps, we’re speaking about more and less comfortable playing. Anyway, we’re still at around the performance of otherwise a class slower RTX 3060.
In the optimal resolution of QHD (2560 × 1440 px) for the RX 6700 XT, there are some improvements in games like Cyberpunk 2077 (5%), Mafia: DE (4 %), Red Dead Redemption 2 (7 % using Vulkan, or 5 % using Dx12), SOTTR (6 %) or Total War Saga: Troy (6 %).
However, it is important to point out all the small downsides in application performance. The differences are usually negligible and are almost always slower times, you rarely come across a test where it would be the other way around. However, with Resizable BAR enabled, we measured significantly worse results in one of the subtasks in CompuBench, TV-L1 Optical Flow (-60 %) and -6 % FLOPS of Double-Precision performance is also stated in AIDA64. When ReBAR no longer can increase application performance, it will be interesting to see when (and if at all) it stops decreasing it. It is also possible that the differences are recognized as so small or rare that the developers will simply not bother with them, we’ll keep track of it and see what happens.
We’ve got the test games from Jama levova
