just put together my new system two days ago and started tweaking it. Started off with my 2500k and is now at 4.6GHz with voltages at 1.288V under load (offset mode) (is that good? lol)
Then moved on to my RAM, which is a Corsair Vengeance Low Profile DDR3-1600 rated at 1.5V 9 9 9 24 timings. This RAM doesnt overclock AT ALL or I'm doing something terribly wrong... I've tried 1866 at up to 11-11-11-27 and 1.7 V and it still wouldn''t POST.... tried also lowering the timings at 1.7V is POSTS but fails memtest at ddr3 1600.... unbelievable..... do other vengeance owners experience this? it is so weird because I read the reviews online and they seemed like they were good overclockers specially with these funky sinks and whatnot...
i5 2500K @ 4.6GHz @ 1.288v with H100 cooler
ASUS P8Z68 V-Pro GEN3
XFX 6950 1GB
Corsair Vengeance Low Profile DDR3-1600
1TB WD green
HAF-X with all red led fans
HX 1050 PSU
RAM is probably the most finicky component. They should overclock at least somewhat when you increase the voltage but Sandy Bridge prefers 1.5v or less most of the time and you may have a bad kit. What is this system going to be used for? most work doesn't have any improvement from getting RAM faster than 1600 and even then it isn't much better than 1333. Games don't take advantage of faster RAM at all and the only thing I know to be sped up considerably is compression.