originalmcblood :
Okay here we go I will try and keep this as concise as possible whilst giving all pertinent info required.
Basic premise no discernible difference (FPS) from single 4870 to 4890 and 4870 in crossfire.
relevant components
CPU :amd II x3 455 (fourth core unlocked) @ stock 3.3ghz
mobo
ok sorry hit the wrong key and posted before finishing:
relevant components
CPU :amd II x3 455 (fourth core unlocked) @ stock 3.3ghz
mobo: ASUS M4A79T DELUXE
GPUs: 1x xfx 1gb hd4890
1x power color 1 gb 4870
PSU: antec earthwatts 650W
oh and 8gbs ddr3 ram (10666)
Other relevant info:
Latest version of CCC
both cards IDed correctly in GPUZ states crossfire functioning @x 8 (checked this out unlikely to be a cause of any bottle neck)
Get the little ATI crossfire icon when crossfire enabled in games
Resolution 1400 x 900.
Fitted the 4890 last night and benched on a few games i.e nba2k11, GTA IV, Dawn of war II.
NBA 2k11 does not ask much of a GPU at max and ceilings at 60fps normally so not surprised no change.
GTA IV notoriously bad port but I would expect some improvement maxed everything out and ingame bench showed about 50 % resource utilisation for all components and a fps of 13!!!
Dawn of war II I expected to scale up but on on ultra settings using ingame benchmark average fps 26, min 1.06 which is about the same as running my 4870 solo.
So any ideas? I have shelled out a lot of money over the last month I have moved from a 4670 crossfire set up to a 4870-4890 cf set up and there is no real difference except to my bank balance.
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