***Asus Rampage III Extreme Owners Thread***

[Raja@ASUS]

This board has some weird quirks, not sure if its just mine........doesnt like 3710MHz uncore and anything less than 1.35Vtt BIOS (~1.296v real - I only needed 1.257v real for that uncore on the R2E). Less than that is stable in all tests, but wont cold boot, just hangs on DRAM. This is not ram timing/voltage related. Same thing happens with 2 different kits. It also just hates having uncore at 2 x ram, very unstable, if I add a tiny bit more voltage than needed to stabilize 3560MHz uncore I can easy do 3710MHz probably more (yet to try). Also needs more voltage to clock the ram than my R2E did (DDR3-1780MHz 7-7-7-21 1T took 1.495v on my R2E, need 1.56v on the R3E), so that coupled with the Vtt I'm using higher voltages all round except CPU.

Looking a my old review results here, the R3E loses about ~0.1V from the VTT last cap on the high side of the power plane to the under socket MLCCs (the gap widens with increasing current - so higher frequncy = more sag). 1.35VTT set is going to be very close to 1.25V~1.27V under full load. The measurement points on the board are a little off, and report the voltage a little higher than it actually is at the north side of the socket.

I never had an R2E here so don't know what the offset between the measurement point and the north side of the socket is. The only way to check is either to flip the board while it's running (tricky) or solder a small wire to one of the MLCCs and check the offset under full load.

Of course, this was don one an earlier BIOS, there is the chance that ASUS have shifted the voltage table to compensate for the delta somewhat.

I don't think this will cure all your quirks but might explain some of the issue.

-Raja