Dual 4850s, Poor Performance When CrossFire Enabled.

[duvelnz]

Hi, first post.

I recently aquired two xfx 4850s. I installed them, and everything seemed normal. My only problem is, when I benchmark my graphics performace, i actually take a slight (5-10%) performace hit when the "enable crossfireX" tickbox is ticked in CCC. I have enabled CGI in my BIOS.

Could this be due to the 16x/4x setup I am running them in, I was led to believe that the penalties that this configuration caused you were quite slight? This was intended as a temporary solution until i could fork out for a new board.

This whole situation has me flabbergasted, so any assistance would be greatly appreciated.

My system is as follows:

- Intel e8500 @ 4.62ghz - Prometia Mach II GT Phase Change Unit - Asus P5K Deluxe - 2gb Corsair DOMINATOR DDR2-1066 D9 - 2x XFX ATi 4850s - Silverstone ST85F 850w PSU - Modded Lian Li PC-7 bolted to Prommie - 1.62tB - Audigy2 -

http://www.iforce.co.nz/i/81b66573f71b21513097578eb5f7dc2a.JPG

 

[pr2thej]

I have a single channel 16x, it will run in 8x / 8x should i crossfire which i probably will in a few months.
Im assured that i wont get a bottleneck, and it would only slightly limit a pair of 4870's.

Bit of reading....
http://www.hardwareanalysis.com/content/topic/73057/
http://www.yougamers.com/forum/showthread.php?t=83243
http://forums.overclockers.com.au/showthread.php?t=692209

4x is killing you and if you can return them for a 4850x2 you wont need to upgrade your mobo

Nice OC btw

 

[duvelnz]

Thanks for that.

Went and swapped them for a gtx280 today, and i am very happy with the results.

4.62 is my daily OC, ive had it to 5.01 stable. -60 does wonders