Why PhysX is so demanding?

[J.b091]

I\m playing mainly only one game - Killing Floor 2. Have this PC: i7, 16GB RAM and GTX 1070 with 29 inch monitor with 2560x1080 resolution & in graphics settings if I set everything on ultra except Flex and Gibs it gives me constant and stable 60 fps no matter how intense are scenes, BUT if I activate Flex or even Flex and Gibs than during combat performance (fps) might drop to 45-40 sometimes. Visually I don't even see difference that much, but it kills performance. Also on Gibs it says GTX 770 or higher is recommended, but even with GTX 1070 I still experience performance loss. Why? Why this feature is so demanding? Can anyone explain me? Thought GTX 1070 would be enough for PhysX.

[mbox]

Older titles with new hardware might not perform well because of optimization and different software intended to be used with the hardware. I think that not many titles use physx this days so new cards aren't designed with that in mind.

[Leonius]

5 hours ago, J.b091 said:

I\m playing mainly only one game - Killing Floor 2. Have this PC: i7, 16GB RAM and GTX 1070 with 29 inch monitor with 2560x1080 resolution & in graphics settings if I set everything on ultra except Flex and Gibs it gives me constant and stable 60 fps no matter how intense are scenes, BUT if I activate Flex or even Flex and Gibs than during combat performance (fps) might drop to 45-40 sometimes. Visually I don't even see difference that much, but it kills performance. Also on Gibs it says GTX 770 or higher is recommended, but even with GTX 1070 I still experience performance loss. Why? Why this feature is so demanding? Can anyone explain me? Thought GTX 1070 would be enough for PhysX.

If you dont see a difference, just leave it off. Some older games simply do not perform well on new high end hardware since they can not utilize all new features. Also PhysX was never very efficient and only few titles utilized it and even fewer utilized it well.

[xAcid9]

Does it actually maxing out your CPU/GPU or both? If not then most probably not optimize.

[Leonius]

8 minutes ago, xAcid9 said:

Does it actually maxing out your CPU/GPU or both? If not then most probably not optimize.

even if they are maxed, does't meant the game is well optimized. A game can still look like crap and max your gpu all day long. Also some features take a huge performance hit for very little improvement. Look at Tesselation and Nvidia Hair works.

[J.b091]

I just found thread on their forum and seems like everyone is complaining of that feature in game and either it's not optimized, either broken... Here link if anyone is interested: https://forums.tripwireinteractive.com/forum/killing-floor-2/killing-floor-2-general/general-discussion-af/2285623-nvidia-flex-fps-drops-still-happening-to-anyone/page2