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Old 05-18-10, 08:53 AM   #1
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Join Date: Jun 2004
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...
gigabyte ga-z87x-ud3h, 8gb ddr3-1866 mhz ram in dual channel,intel xeon e3-1245v3 3.4 ghz quad core cpu, zotac gtx 770 amp 2gb 2 way sli,2x ocz agility 3 90gb ssd in raid 0,rosewill 750 watt 80 plus platinum psu,antec gx 700 case, lg 14x bluray writer,windows 8.1 64 bit pro, steelseries 6gv2 keyboard ,asus vg278he 27' 144hz 3d vision 2 lcd monitor, steelseries 6gv2 keyboard, zalman eclipse 8200dpi mouse,xbox 360 wired controller for windows,adata 16gb usb 2.0 flash drive,windows 8.1 64 bit,creative labs sb recon 3d pci-e sc

Brother's system: Asus p8z77-v lk mb, 8gb of ddr3 1600mhz ram,intel core i7 3770k 3.5 ghz cpu, intel hd 4000 igpu, ,antec earthwatts 650 watt 80 plus platinum psu,cooler master 3500 dpi spawn mouse, ican keyboard, logitech ls120 2.0 speakers, cooler master elite 343 matx case, corsair force 3 90gb ssd, pioneer bdr-208 15x bluray writer, acer g215hv 21.5' 1080p monitor,kingston usb 2.0 8gb flash drive,win 8.0 pro 64 bit,onboard realtek audio

I'd rather walk with God in the Dark than shine in the light alone.
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