My L737B has a vid of 1.2125v , it is stable at 3200 with 1.2425v and 3600 at 1.3925v but I have been trying for days to get it even benchable at 4GHz . I achieved this today , I ran 3D06 at 4005MHz along with wprime 32 and 1024 but it took near 1.7v to do it and its only just stable enough for that . Temps were sizzling too , up to 86 while running 1024 so I wont be doing that too often. Thats with a lapped Fuzion , triple rad and IHS lapped too .