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CrossfireX & 2 x 280x's are they working?
https://www.wsgf.org/phpBB3/viewtopic.php?f=72&t=27086		 Page 1 of 1
Author:  hitt0r [ 15 Feb 2014, 06:02 ]
Post subject:  CrossfireX & 2 x 280x's are they working?
My Rig:

i5 4670k @ 4.2Ghz w/ Evo 212.
MSI Z87-G45 Gaming (16/8,8/4,4,4)
Sapphire Toxic R9 280x (Master) Drivers v14.11 - GPU 1150 / Memory 1600
MSG Gaming OC R9 280x (Slave) Drivers v14.11 GPU 1020 / Memory 1500
Kingston HyperX 8GB (2 x 4GB) DDR3-1600
Samsung 840 Pro Series 128GB SSD
Seagate Barracuda 2TB
XFX 850W Bronze.
3 x LG 24EA53V-P 23.8" Displays

i seem to have crossfire working in Metro Last Light and 3dmark now and i'm just trying to get crossfire working correctly on 1 monitor first before looking at all 3.

i'm using beta 14.11 CCC and when i use afterburner to monitor GPU usage i notice that both GPU's are running at stoc speds i.e. 1 x 1150 and one at 1020. i thought they should both run at the slowest cards speeds? it's the same with the memory 1600 and 1500. i've disabled AMD overdrive as if i enable it , i get worse performance.

if i change the settings in afterburner to duplicate the performance on both cards, they run at the lower speeds, but shouldnt AMD overdrive or the CCC do this automatically without the intervention of a 3rd party app like msi afterburner?

really interested in getting some detailed help / advice on this.

thanks in advance.
Author:  jovechiere [ 15 Feb 2014, 12:45 ]
Post subject:  Re: CrossfireX & 2 x 280x's are they working?
The 3 monitors are connected to the primary graphics card?
You can only create a crossfire eyefinity group, if all monitors out of the same card.
Author:  hitt0r [ 15 Feb 2014, 15:10 ]
Post subject:  Re: CrossfireX & 2 x 280x's are they working?
Hi

yes i have them connected via 2 x DVI & 1 HDMI. (no active adaptor needed due to 280x) i have an eyefinity group created and running fine now.

so since last night i have a fully functional crossfireX set up which i manually set the GPU's to run at the slower speed (1020/1500) for some games like DayZ to be stable. other games like Metro Last Light it seems to run happily at 1150/1020 & 1500/1600. WEIRD!

ive disabled AMD overdrive as this seems to cause all the problems.
Author:  Haldi [ 15 Feb 2014, 18:46 ]
Post subject:  Re: CrossfireX & 2 x 280x's are they working?
There is no need for both cards to run at the same clock speed.
Crossfire works fine even if each card has its own speed.
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