Ok some clarification is needed as there may be a bit of confusion as to what some terminology means.
From your OP;
Do you have one or two HD6670 add on video cards fitted - working in Crossfire mode?
My first suspicion is that your PSU is under powered, please note that a single 2GB HD6670 requires a PSU with a Minimum
400W output http://www.amd.com/U...overview.aspx#3
meaning your present PSU may not be up to the job as some 400W CWT PSUs only put out 336W maximum load, see http://www.realhardt...rchivos/CWT.htm
My post #2
Please provide information about your computer, is it a custom build or brand name such as Dell or HP, if it is provide the model name or series number (not serial
In your reply you provided the requested video card and PSU details but only your CPU specs (see .jpeg below) and nothing regarding your motherboard, HDDs and any other possible add on cards and all of these things determine the quality and output of the PSU required, please provide the additional details and I strongly suggest that you do not apply power to your PC at the moment.