I have an older computer and recently one of the 4gb RAM sticks died so I bought 2 new ones cause I figured why not add a little more while I'm at it. I have an ASUS P6X58D premium mobo that has 6 DIMM slots for triple channel memory up to 24gb. Previously I had 3x4gb so now I would be running 4x4gb. After boot it recognizes the memory and runs fine for about 5 minutes before the screen goes black and says "No Signal". Everything is still running and only fix is to reset the computer. Pop the 4th stick out and everything runs fine. GPU is AMD Radeon HD6950. Any thoughts or input is appreciated.