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HD5870 in crossfire and crysis

I put two 5870's in crossfire and my fps gets worse in crysis. I had them in crossfire with two bridges so I took one off to see if that made a difference and it didn't. But yeah I go back to just using one card and it gets about 10 fps or more better. I also have the latest driver 9.12 and the hotfix.
So why would this be happening???
17 answers Last reply Best Answer
More about hd5870 crossfire crysis
  1. You sure your PSU can power two of those cards?
  2. And post what components make up your computer, it could be a CPU bottleneck aswell.
  3. Psi=rosewill bronze rbr 1000watt
    CPU=i7 920 @ 4ghz
    mem=6gb ddr3 1600 6-7-6-18 mushkin redline
  4. On fear 2 when I added a card it bout double fps.
  5. have you got all the crysis patches?
  6. Are you noticing any slowdowns in other games also? or they run better?
  7. I have original version no patches. Could that have something to do with it.
    Other games my fps gets alot better in crossfire.
  8. Best answer
    yeah you need the patches i dont think crysis supports croossfire out the box
  9. Ok i'm gonna try to update and see what happens. So what's wrong with rosewill psu? I've seen alot of good reviews on them and you can get em for a cheaper price.
  10. I have the same PSU, so far so good :-) and if it does blow up... Oh well there's worse thing in life :-D hopefully it doesn't take any other components with it if it does.
  11. Crysis' single player campaign with UH gfx mod and advanced AI mod was more fun than COD4's campaign.
  12. Install patch 1.2 and tell us if it fixes the performance problem. Here's the url: http://www.crymod.com/filebase.php?fileid=1073&lim=0
  13. Ok I have installed the patch and I get better fps overall but my fps decreases 5-10 fps with crossfire. Any ideas? Does crysis support crossfire??
    Here are my specs but I just built this computer....

    Motherboard: Asus P6x58D
    Memory: Mushkin Redline 6GB 1600Mhz 6-7-6-18
    Graphics: Sapphire Radeon HD5870 x2
    PSU: Rosewill bronze rbr 1000 Watt
    CPU: i7 920 @4ghz
  14. my crossfire is in working condition because I noticed around a 120 fps increase when starting a game of fear 2.
  15. I just figured it out. I took the overclock off on my i7 920 and put my bios at default and now im playing crysis at max in crossfire with fps in the 50s. Smooth as silk. And now when I put just 1 card in action I get fps in the 20s. I guess crysis doesnt like an overclocked cpu. But with the cpu at default my fps went down in fear 2. I dont understand? But heck I still get fps in the 100s. But could anyone explain why crysis would perform better with a i7 920 at 2.66 rather than 4ghz?
  16. Maybe your PSU is a bunk unit.
    Your video cards alone have a TDP of approx 375watts just by themselves. It's not likely but still conceivable that the 50watts or so that you saved from dropping back to stock speed may have been enough to return the overall system TDP into workable range for the Rosewill.

    Also...did you check your temps while running Cryis OC'd?
  17. mstang783 said:
    I just figured it out. I took the overclock off on my i7 920 and put my bios at default and now im playing crysis at max in crossfire with fps in the 50s. Smooth as silk. And now when I put just 1 card in action I get fps in the 20s. I guess crysis doesnt like an overclocked cpu. But with the cpu at default my fps went down in fear 2. I dont understand? But heck I still get fps in the 100s. But could anyone explain why crysis would perform better with a i7 920 at 2.66 rather than 4ghz?


    I'm not sure why yours is doing this. I also have an i7 920 with 5870's in CF. It ran as smooth as can be at 3.5Ghz. I probably could go higher, but from Benchmarks I've seen, it wouldn't improve performance. Even 2.6Ghz is near the limit on what would help.

    http://www.xbitlabs.com/articles/video/display/radeon-hd5870-cpu-scaling_4.html#sect1
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