CrossFire hd 4850

[phetality33]

Hello,

AMD Phenom III 720 3.2ghz OC
GIGabyte 790x ds4 MB
Corsair 850 watt PSU
4 gbs ocz reaper MEM
2 Sapphire HD 4850 512mb cards
CCC 12.1 drivers
windows 7 home premium 64 bit

Running one card in BF3 all custom low settings 1680x1050 i get about 45 fps. when i crossfire my cards i get about 35 fps with the same settings. the cards work fine, i am need some help.

 

[phetality33]

Hello,

AMD Phenom III 720 3.2ghz OC
GIGabyte 790x ds4 MB
Corsair 850 watt PSU
4 gbs ocz reaper MEM
2 Sapphire HD 4850 512mb cards
CCC 12.1 drivers
windows 7 home premium 64 bit

Running one card in BF3 all custom low settings 1680x1050 i get about 45 fps. when i crossfire my cards i get about 35 fps with the same settings. the cards work fine, i am need some help.

 

[dechy]

Little question; did you check the CCC setting to make sure CFX was turned on? Sometimes the damn thing doesn't turn on by itself (or turns itself off after a driver update).

I use Radeon Pro to check if CFX is really working (you can see the load each card is getting)

Also, I'm not 100% sure if it's true, but did you use both CFX links or just the one? I haven't even tested myself, but there are people that sware that using both links help with load or is sorta of a backup... I used both, haven't had issues so I left them there, but chances are you don't need both... but you never know.

 

[phetality33]

i used amd system monitor to check if CFX is working and only one card works. my CFX does like to turn on and off randomly but i check it before i play any games. I also have two CFX bridges connected to my cards.

 

[SinisterSalad]

Running something like GPU-Z may help to see/confirm that crossfire is actually enabled, and at what settings (16x & 1x, 8x & 8x, etc.)

 

[Mousemonkey]

This next topics has been merged by Mousemonkey
■ CrossFire hd 4850

 

[4745454b]

Does BF3 support CF? Its a new game and not all new games support CF. Try checking with a different game. (or two.)

Edit: See if this link helps any.

http://www.overclock.net/t/1151112/battlefield-3-crossfire-issues-complete-list-of-known-fixs-here-11-11b-link-inside

 

[vrumor]

I run crossfire 7970s and use 1 crossfire bridge. Only use more than 1 when you are trifiring or quadfiring. Or is that bad info?

 

[phetality33]

Ill try these suguestions and let you know how they go. As far as crossfire bridges i think i only need one but i hear two doesn't hurt.

 

[phetality33]

ok i ran single player, i set ccc to show the crossfire logo in the corner and ran gpu-z. crossfire was working. i reinstalled my drivers and set them to defualt. when CAP was set to BF3 crossfire would not work. while i was playing i was getting around 60 FPS with the medium settings 1650x1050. only problem was it would some times dip to as low as 17 FPS then jump up to 70 FPS. is this due to a bottleneck in my system?

 

[phetality33]

you can close this thread. i am giving up on crossfire. i will buy a 7850 when they come out. one card is less headache and less noise

 

[SinisterSalad]

The 4850's are power hungry and hot, anyways, lol. I had them crossfired at one point, too.

 

[phetality33]

Best answer selected by phetality33.