Do games even use PhysX anymore? I always thought it was a gimmick API that died a long time ago.
Matthew, in what way is a GTS 450 a 9800 GTX rebadge? It's video card history time! They're actually completely different. 9800 GTX was G92 based and a rebadged 8800 GTS. The 9800 GTX+ was G92b and the same core config but higher clocks, and then rebranded as a GTS 250. The GTS 450 is a GF106 Fermi based card having no relation to either Tesla architecture or the first CUDA (G80/G9x) cards. It has 192/32/16 shaders/TMUs/ROPs vs the 128/64/16 of the G92/G92b.
The GTS 450 actually has less raw single precision GFLOPS throughput than the GTS 250. End history lesson.
Serious question. But what about a dual 770 with a 460 for physx? pointless or worth it? (my new build is 2x 770 sli and have my old 460 for physx if need be)
If you didn't sell the GTX 660 it would be better to use it for PhysX with a GTX 780. I made a post where I tried out an old GTX 570 I had sitting around for PhysX and it is possible to see upward of 50% more performance with hardware-accelerated PhysX. The GTX 660 and 570 are similar in both 3D and DirectCompute performance, so performance gains should be similar if not better when pairing the GTX 660 to your GTX 780. The post I made analyzing my results can be found here. YMMV, of course.Currently I'm running a GTX 660 Ti and have been using an old GTX 280 for PhysX but I'm about to replace the 660 with a EVGA 780 Dual FTW and was wondering if it was still worth keeping the 280 installed for PhysX with the 780.
Will my 750w PCP&C PSU be ok with both cards?
I've had the original Thermaltake W0131RU 850w model for 7 years now (4 separate +12V rails ) and it hasn't skipped a beat. It's actually in its third system now . It's always great to have a part that continues to operate outside of the warranty period. That unit of yours is a pretty high-quality product as well, so I would expect it to still be trucking along strong.I installed the 780 this morning and just left the 280 out of the case. I'll just have to play Borderlands 2 and the Batman games with PhysX on. If it runs well I won't bother with the 280. If it gets laggy with PhysX on I'll throw the 280 back in and see how goes.
The power draw of both the 780 and 280 does concern me though since I've had this PCP&C 750w Silencer for a long time now. I'd have to look it up but it's at least 6 years old. That's the longest I've had any PSU.
It may have been an issue with older drivers, but my experience has been that the PhysX card is basically turned off by the driver when not in use. The only performance hiccup I experienced has been in Arkham City's benchmark. During actual gameplay the game was smooth with higher average framerates while using High PhysX settings. Can't say that visual fidelity really benefits in Arkham City, but there was a significant improvement in Arkham Origins. While running with High PhysX on my 780, the PhysX accelerated particles would sometimes glitch and pass through objects. Dedicating another card to PhysX completely eliminated these issues.I feel like I read an article way back when saying that running a dedicated physx card that is older than your current main video card could make your system actually perform worse than without the physx card due to sync issues.
TBH I think the 780 should more than be able to handle physx on any game currently. As long as the rest of your system is good you shouldn't really have any issues. (also as long as the implementation in the game is actually decent)