L4D2 Demo Poor with 5870 CF?

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Appa

2[H]4U
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Oct 22, 2005
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Anyone know why the L4D2 demo is not using Crossfire? Is there a way to fix this or just wait until the patch it?

With my sig system I'm getting about 50 FPS at 1920 x 1200 w/ 4X AA, 8X Aniso everything at high or very high.

If I change it to 2X AA or turn AA off, then frames go way up.
 
i dont have a 5870 but have you tried forcing AA through CCC instead of in game and see if that works better?
 
It's an engine glitch, happened exactly the same way in L4D1. You have to change your AA ingame, then the fps will be fine (4x aa fine too). Set AA to 0, load a server map, change aa to 4x and play. That's all you can do till ati patches it into drivers officially.
 
It got massive fps drop so far for my old 8800 GTX..

so i guess it just demo that got really bad performance for some reason..
 
unrealsword said:
It's an engine glitch, happened exactly the same way in L4D1. You have to change your AA ingame, then the fps will be fine (4x aa fine too). Set AA to 0, load a server map, change aa to 4x and play. That's all you can do till ati patches it into drivers officially.
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Thanks!! this works like a charm.
 
The demo is out already? Just tried to launch it and it says not yet available?

edit: Never mind I just needed to restart Steam for it to show up as available.
 
Only fairly recently did Valve add an option in the graphics menu to enable multi gpu rendering, presumably they did their own optimisations for MultiGPU users, I expect that might need to be tweaked for newer cards like the 58xx range.
 
I'm running a stock 5870 with an i7 920 @ 3.2ghz. Played a lot of the demo last night. I'm running the demo on an eyefinity setup 5760x1200 with everything on max, 16x AF set in CC and highest in game AA set in the menu, I believe its 6 or 8x. My framerate is often around 60fps, lowest i've seen it drop was mid thirties in the park portion of the demo (with a LOT of zombies on screen). I'll admit, there is a bit of hitching once in a while (my guess is that the card is running out of video memory, but the framerate doesn't seem to take much of a hit)
 
Sparrow_69 said:
I'm running a stock 5870 with an i7 920 @ 3.2ghz. Played a lot of the demo last night. I'm running the demo on an eyefinity setup 5760x1200 with everything on max, 16x AF set in CC and highest in game AA set in the menu, I believe its 6 or 8x. My framerate is often around 60fps, lowest i've seen it drop was mid thirties in the park portion of the demo (with a LOT of zombies on screen). I'll admit, there is a bit of hitching once in a while (my guess is that the card is running out of video memory, but the framerate doesn't seem to take much of a hit)
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yea that part stutters like crazy even when AA is off on my 8800 GTX.

funny thing is, haven't seen anyone say its microstuttering yet... :p
 
shansoft said:
yea that part stutters like crazy even when AA is off on my 8800 GTX.

funny thing is, haven't seen anyone say its microstuttering yet... :p
Click to expand...

I've been observing some microsuttering going on (4870x2 user) which oddly enough will happen with a single common zombie on screen, not with the player characters but only an enemy zombie :confused: anyways I attribute this to drivers / demo not being optimized 100% yet.
 
I've had some framerate problems in L4D with my Crossfire set-up.

I had horrible FPS with the game set to 8xMSAA and the CCC to edge detect 12X.
I just set the CCC to application and the in-game to 4xAA and the frames jumped to greater than 100 consistantly.
 
KayossZero said:
I've been observing some microsuttering going on (4870x2 user) which oddly enough will happen with a single common zombie on screen, not with the player characters but only an enemy zombie :confused: anyways I attribute this to drivers / demo not being optimized 100% yet.
Click to expand...

meh, that is just pure stuttering, it stutters with single GPU when AA is on, no idea why, but it happens...
 
yeah confirmed its a game engine or driver error. same thing with me and l4d2. will have to try the aa trick.
 
The machine in my sig plays the game stutter free @ 1920x1200 4x 16x. Everything is as smooth as butter.
 
I was having some FPS problems with my system (in sig) at first. Turns out that SuperSample AA takes a huge performance hit over MSAA. So, I set it back to MSAA in CCC, all is well now @ 1920x1200, 8xAA, 16xAF, averaging 120fps+.
 
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