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Old 05-18-10, 08:53 AM   #1
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Location: Hamilton,Ontario,Canada
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Default a little warning about gtx 480 and dedicated physx cards

I am using a pair of evga superclocked gtx 480's in sli with a zotac overclocked gt240 for physx. Works ok but with one hitch. Before I go on, I think I know why Nvidia is splitting up there drivers into dx 9 and 10 for one and 11 for the other. Because I installed the 197.75 drivers with a modded inf to get the gt240 to work. It installed fine and I was able to get the gt240 as my physx card. Even tested it Batman:AA. Works fine. Here is where it's gets crappy. So I had just finished BF:BC2 and was installing metro 2033. When the title screens came up, they took 1 minute to come up. Thought it might have been my 3d vision goggles, so I disabled them. Took less time but metro 2033 by nvidia's compatibility is a 3d vision ready game. Then when I got to the menu, I noticed that the direct x 11 options are greyed out. Got me curious since you buy something to make use of it being the gtx 480's. Went to dxdiag and noticed that it showed a DDI of 10.1 and not 11. BTW, I have the windows hotfix that makes the DDI appear properly as 11 as windows 7 doesn't show this right on a fresh install without the hotfix. Then I loaded GPU-Z. I noticed that direct compute was greyed out for the gtx 480's but showed everything else as it should. Double checked this with my brother's pc (he's only using two gtx 480's) and his shows everything as dx 11 with direct compute. So, it seems that when a lesser dx card for physx is mixed with dx 11 cards, the nvidia drivers downshift to the lesser dx version of what's there. Kinda sucks unless you wan't super overkill and get a gtx 470/480 for physx. Mind you with my sli setup, I am not worried about physx slowing me down. Now off to take out the gt 240...
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