Guys.. I need your opinion on something... My system is stable at 3800mhz with the RAM running at 1140mhz (6-5-5-20-1T). The next step to choose is (because of Strap) 1520mhz. I changed the timings to 7-7-7-24-2T and it runs memtest86 without any trouble. Now, with this set I can't run the prime blend test as it fails within minutes. The small FFT test seems to be ok. So the issue I'm facing is that the memory seems stable in DOS with memtest and the CPU seems stable in Vista OS but the system as a whole is not. Like I said the blend test fails and also when starting up a game (LOTRO, Warhammer) it crashes during loading. My vNB is set very low at the working settings so I thought I need to increase vNB to compensate for the higher RAM frequency. I went from 1,41 to 1,55 but the system remains unstable. It's weird that with more relaxed timings and 2T the system is not stable. Also strange is that the RAM only requires 1,7v to get through the memtests.

Could it be that I need to increase the vNB even more? It's watercooled so I have some headroom.
Who helps me deal with this strange issue. It kinda sucks to have the memory run below it's designated speeds.