DirectX 9 vs. DirectX 11

#1GenTRPosted 9/21/2010 10:07:19 AM
I just fired up the game and it gives you the option to run using either Dx 9 or 11. When I ran it in 11, the game was slow as molasses, but with 9 I'm getting close to 60 fps most of the time and this is with everything running on high settings at 1600x900. I was a little worried for a second there when I first loaded it using the recommended Dx 11 and the performance was so bad, but Dx 9 is running great.

But I'm curious why Dx 11 would be so slow...anybody have any ideas? I have Dx 11 on my machine so I would like to use it if possible although the only difference between the 2 that I see in the settings is that there's no anti-aliasing using Dx9.
#2XXAMPXXPosted 9/21/2010 10:08:04 AM
Same exact problems
#3dudy80Posted 9/21/2010 10:16:50 AM
Dumb question but your card supports dx 11 right? Not sure exactly what graphical differences there would be.
#4Rahven2kPosted 9/21/2010 10:21:01 AM
^As he said. If your graphics card doesnt support dx11 then it will be sloooooooooow.
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#5ScorpioVSPosted 9/21/2010 10:22:33 AM
how do you know if your graphics support directx 11?
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#6Dragon0283Posted 9/21/2010 10:27:03 AM
Best basic rule is if you have one of the newest cards you should have dx11. If not use dx9.
I believe you can check via the 'dxdiag' command.
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#7GenTR(Topic Creator)Posted 9/21/2010 10:39:51 AM
I ran dxdiag and it says DirectX 11 which is why this is odd. My card is an Nvidia GeForce GTX 260M if that helps.
#8canadafrost301Posted 9/21/2010 10:40:37 AM
if you have a 400 series card from NVidia or a 5000 series card from ATI then you will support DX 11 otherwise its 10 and lower
#9TheKnytePosted 9/21/2010 11:03:13 AM
dxdiag will only tell you what version of DirectX software is installed on your PC. You can have DX11 installed on your PC, even if you don't have a DX11 videocard.

Like someone above said, only the following cards currently support DX11, only the top card support it well:

Radeon HD 5xxx series.

GTX/GTS 4xx Series.

If you have anything else, you don't have a DX11 certified card.
#10GenTR(Topic Creator)Posted 9/21/2010 11:08:40 AM
Well that would explain it..thanks for the info. Like I said, Dx9 looks great and I think the only difference is you can turn on anti-aliasing in Dx11.