Hi, I haven't been around for a while because I was moving house.
As I have previously stated, the load Vcore is around 0.1V less than the BIOS figure, this is the Vdroop on the board.
Therefore to achieve the 1.475V Vcore required for a decent overclock, the BIOS needs to be set to 1.575V.
Remember that with this board because of Nvidia chipset, achieving high overclocks of over 4Ghz are going to be near impossible.
I am still having issues with CPU/NB voltage, at one point manually setting it was working, then next boot, it wasn't again.
Due to issues in gaming, that are not showing up while stress testing with anything, including prime 95, Intel Burn Test and OCCT, I have reduced my CPU/NB down to 2640, I can stress test for hours with the CPU/NB at 3000Mhz plus but still the issues when gaming occur.
The AUTO CPU/NB voltage for 2640 is 1.35V and as stated before, I can't seem to manually change this, god knows why! I feel that this is too much voltage especially on a 1090T, the X4 may need a little more volts on CPU/NB than the Thubans.
The BIOS is working very strangely at the minute, all the options for the Turbo core are missing, next boot they might be back, I think this Second hand board is very flaky!
3.96Ghz is the absolute limit for the 1090T that I have but that was the same on another board, so the chip itself is limited at that, 1,2, or 3 cores will always fail beyond that.
I can report that the Crucial Ballistix tactical tracer RAM is still working like a charm at 1760Mhz at 8-8-8-24 1T with 2 x 4GB installed, cracking RAM! (1.65V).
What I am largely unsure about is that in the manual it states that the overvoltage jumper in default position is good for voltages up to 1.55V, I am assuming that this is BIOS voltage and not the Vdroop voltage, therefore I feel that to achieve the necessary 1.575V (BIOS) to give 1.475V Vcore then the jumper will have to be moved to its overclock position.
I am not sure why this is the case again on this board, on the M4N72-e I had previously the Overvoltage jumper only needed to be moved to get beyond 1.6V BIOS. Why a higher end board is configured like this is beyond me!
I am gonna try a CMOS clear and re flash to the latest 1301 BIOS and try to start again. I am concerned that using easy flash from the BIOS is not actually flashing the BIOS at all.
This is a very strange board and I think mine is stranger than most given the CPU/NB issue.
I was looking at a Sabertooth 990FX instead but would lose the native support for my HDD that requires the old fashioned non SATA connection.