IS it my PSU or Crossfire doen't work very well?

[Eddred]

Hello,
so i have a radeon HD 7850 2gb and recently i bought another one for $140 1gb with 2 freegames(Bioshock and Tombraider) a week ago and my new PSU is on the way, however my current PSU is 500w, the one i ordered is 600w; so today i plugged my new Card and tried crossfiring, but it seems that any game i play i experience stuttering all over. is it my PSU or or there is something wrong with corssfiring or is it because one of my GPUs is 2gb while the other is 1gb? or my PSU isn't capable of handing both?

specs

CPU: intel i5 2500k 4.2
GPU 1: Sapphire Radeon hd 7850 OC version 2gb
GPU 2: XFX 7850 1gb
Mobo: Asrock Z77 Pro 4
RAM: Kingston Hyperx BLu 8gb
HDD: Western digital caviar black 1tb
SSD 1: Samsung 840 series 240gb for OS
SSD 2: OCZ agility 60GB
PSU: Coolermaster Extreme 500w

 

[daswilhelm]

well, your current psu isnt enough for both. and the 1gig card is limiting your other card to 1gig as well, so you'd prob be better off with just the single 2gig card.

 

[Eddred]

well, your current psu isnt enough for both. and the 1gig card is limiting your other card to 1gig as well, so you'd prob be better off with just the single 2gig card.

so what can i do, i can't return the card because i already entered my codes for free games on AMD site?
where can i sell it to someone?

 

[daswilhelm]

wait for the new psu and see if that makes a difference? if not sell it on craigslist or ebay etc...

 

[spawnkiller]

+1 500w for mid-high end GPUs is really close so that could be an issue... Also you could try to remove and reinstall the latest AMD drivers to see if that's not the drivers that are buggy...

PS: your 2gb card is limited by the 1gb card under it like daswilhelm wrote...

 

[Hard Line]

also make sure you download and install teh caps as well...

 

[Eddred]

also make sure you download and install teh caps as well...

what caps?

 

[iam2thecrowe]

depending on the game it could be a ram limitation. games like BF3, Crysis2 and Skyrim all use more than 1gb vram at max settings. That WILL cause stuttering, especially when you add crossfire into the picture. the psu you have is not enough, but it may not be the issue causing your stuttering. Crossfire is crap at the best of times, particularly on mid range and low end cards. turn all the details down in your games and see if it still stutters, if it doesnt your probably maxing the vram of the 1gb card. If i were you i would sell both cards and get a better single card. You probably could get away with not upgrading the psu then, and you wouldnt be restricted to medium detail levels by your 1gb card.

 

[Hard Line]

caps are catalyst application profiles. http://support.amd.com/us/gpudownload/windows/Pages/radeonaiw_vista64.aspx ( I used the windows 7 x64 link to them.. it's the bottom of the page

 

[Eddred]

if the problem persists even after installing the 600w PSU i will try to sell the 1gb card ,but i haven't sold anything online so i might need some input on where to sell.

this is the link to the card http://www.newegg.com/Product/Product.aspx?Item=N82E16814150656
bought it for 165 and it is 140 after the rebate, but i haven't processed the rebate yet.

 

[Eddred]

caps are catalyst application profiles. http://support.amd.com/us/gpudownload/windows/Pages/radeonaiw_vista64.aspx ( I used the windows 7 x64 link to them.. it's the bottom of the page

oh, that, i thought it was something new.
many around me call it catalyst, maybe that's why.

 

[Hard Line]

there are 3 things on that page. the 1st item are the catalyst drivers, the 2nd is a beta driver, the 3rd is the caps ( for multi gpu setups.) you need catalyst AND caps for multi gpu setups (1st and third)

 

[cookybiscuit]

You might still be able to return the card even after using the codes. I returned a card before after redeeming the AMD Never Settle code things, they never even asked for them.