New build with AMD Phenom CPU and 4 GB Corsair CMX4GX3M2A1600C9 but one stick is bad so will be RMAing both sticks for replacement. In the meantime, I can get 4 GB Corsair CMX4GX3M2A1600C7 on sale at Frys. If I did so, would the slightly different latency be an issue when I eventually get the CMX4GX3M2A1600C9 replacement sticks? I'll eventually be running dual boot XP with Win7. I do quite a bit of video editing, rendering and file conversion. Will the 8 GB of slightly different latency memory be of any use? Or should I just get my defective memory replaced and not bother getting any additional memory in the meantime. Comments appreciated.