HELP Crossfire 2 4890's

[jlear3]

I just got my 2nd 4890 and was all syked for awesome 60+ crysis fps, and now im about to throw my *** in a dumpster.. these cards work worse in crossfire than alone!! just sitting on the beach lookin at the horizon in crysis i get 90+fps with each card alone, but hook em up together and i get 70-73 WTF ive tried everything, switched and switch used one bridge and 2 bridges someone please help me!!!

 

[jlear3]

If i run crysis, and watch the gpu activity, only one card is doing all the work, though it seems both cards are working, as they work alone.

 

[xc0mmiex]

can we get more specs on your rig?

 

[masterjaw]

Specs please. Especially PSU and mobo.

(I hope this case isn't like the one who tries to do crossfire in an asus sli deluxe mobo.)

 

[jlear3]

nope lol,
Phenom II 955
MSI 790fx-GD70
psu is a kingwin 750w modular
2 diamond xoc 4890's
150gb raptor
640gb WD

 

[masterjaw]

OMFG! Doing CF with that crappy PSU is a no-no. Get a better one like a 750tx.

 

[jlear3]

lol, wanna buy a nice modular PSU??

 

[masterjaw]

Here's the modular variation of that.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010

 

[jlear3]

yeah im lookin at it right now actually its in my cart rofl, you think that would cause bluescreens too?

 

[jlear3]

im pretty sure it would, cuz this didnt happen till i was using my 2nd 4890 and it only happens when they're being used and the PSU does get quite hot.

 

[masterjaw]

BSOD happens because your crappy PSU can't handle the load of 2 4890s. Good for you that it didn't explode at all.

 

[jlear3]

lol, tyvm new one in the mail and this ones on ebay