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Normally i would look to your build, but as you have a good PSU and know the system works otherwise, it very well may be the card. I have seen a lot of defective ones recently (well, not a lot, but enough to know it is not impossible). What I would suggest is reformat and reinstall windows just to rule out Software and make sure you have the newest motherboard BIOS. Once all that is done, if ...

If you are planning to crossfire eventually, then HD5770. Its not as fast as the HD4890 but HD5770x2 definitely packs a wallop! Plus mention the brand of your PSU. Its also important along with the ratings. And also your screen resolution.

500W is the bare minimum for a 5850, have you tryed unpluging a few fans or anything you dnt need, just to see if it boots. I've never heard of Procase before, are they a quality brand? Does the PSU have enough amperage to support your setup?

and look this this lines are saved and screen is with this lines: http://img442.imageshack.us/i/33071149.jpg/ http://img260.imageshack.us/i/sa2h.jpg/

Sorry for double post, but about COD4, I shown my specs to another person, he said I could get 30-35 fps on High on cod4.. But if css is worser graphics than cod4 it will have less fps and lag MUCH more D:

It will do the same thing whether you have a second card or a single card in extended mode bruh.

If you don't want to spend much the first thing you should do is drop the water cooling. A good air cooler should be fine and much cheaper.

Are you building the rig on a website or yourself??

Uninstall the driver. Clean the remnants with driver sweeper. http://www.guru3d.com/category/driverswe eper/ Reinstall.

Okay, it seems u messed up with the drivers... Format your OS, re install windows and install driver for your card again...

Sorry for double post, but about COD4, I shown my specs to another person, he said I could get 30-35 fps on High on cod4.. But if css is worser graphics than cod4 it will have less fps and lag MUCH more D:

Look through this benchmark......look for your res...look at the numbers...... then read the first paragraph of the conclusion section.......... personally I would never buy a graphics card with a 128bit memory interface. http://www.xbitlabs.com/articles/v [...] firex.html

Try running everything in CCC as application settings or off. I don't lett CCC decide anything, heh. Also, the 5870 will be drawing more power than your 8800gts. Do you have an older PSU that meets ratings, but perhaps has lost some of it's oomph? Are you having any temperature issues?, Normally a high temperature is more prone to cause artifacting and crashes, but it can't hurt to be sure. ...

Monitor? What resolution?

If you are planning to crossfire eventually, then HD5770. Its not as fast as the HD4890 but HD5770x2 definitely packs a wallop! Plus mention the brand of your PSU. Its also important along with the ratings. And also your screen resolution.

No,2 HD 4890s should perform like a 5870 and maybe a little better

What is the native resolution of your monitor

that is not going to work.... any of it. For 6 screens you would need the 5870 Eyefinity Six edition, that hasn't been released yet. The newest 9.12 hotfix drivers enabled eyefinity for crossfire setups, but I dont know whether it supports 6 screens (3 on both cards) or just 3 on the 'master' card. You should check it out nevertheless... I haven't bothered to dig in too deep in it... The ...

28A on the 12V rail is horribly low for something that claims to be a 550W PSU, the corsair 400CX offers 30A and you wouldnt run a 4890 off of that would you? That PSU calculator calculates the total power draw of the system, remember that about 80% of the power a modern system uses is from the 12V rail, and yours can only provide up to 336W from its 12V rail so you certainly dont have enough ...