Can anyone tell me what they generally run their tRFC at with 4gb kits? I'm using the G.Skill 2x2gb kit now and am having trouble getting stability and have a feeling it's due to tRFC...from CPU-Z, the SPD reading said 48..but should it be higher?...I had no trouble using my 4gb kits on my Asus P35 board...but with DFI, I can't get it stable at all.