Sorry been a bit busy and I re installed windows 7 x64 this last week end. but still the same results.
I experience a little bit of stuttering when I play games metro2033 I get some stuttering during cut scenes as well as on black ops II. during game play I don't see it very much at all. but when I turn off crossfire stuttering is none existent I don't see any stuttering on anything I do. 1 7970 works great everything is as smooth as smooth can be.
and no I did not get my info from DXDIAG the below picas will show what I am talking about.
I can see that crossfire is working in GPU-z and using CCC I can see that crossfire is enabled. GPU-z will report the memory working fine on both video cards voltage is working and I have pulled both cards and test them both individually with both cross fire power cables so no issues there.
I can see that things are working fine however my issue is this. when I had 1 HD5750 I was able to play games pretty well at that time after adding a second HD5750 I had a considerable performance gain. when checking the dedicated video memory this read double. this is the same board that those 2 5750s were installed on. I also have a ASUS A8n32-SLIDELUX board and ran dual 7600GT's on this and experience the same. this was my first build several years ago.
now with dual 7970's (VisionTek) after enabling crossfire my dedicated video RAM drops???? and I loose performance??? WT$ ok so I uninstall reinstall swap video cards change slots put them in slots 1 and 3 ( what the manual said) buy an new bridge use 2 bridges and still no change.
I have searched this problem all over the web but nothing this seems to be the first of this type of question that has ever been posted.
sorry wont let me upload any files.
please see the pics at this web site http://www.overclockers.com/forums/showthread.php?t=723782