OK, as some of you know from my H100 vs NH-D14 thread in cases & cooling, I've got my 2600K currently setup with the H100. Both are lapped.
My mobo is the Asus maximus IV extreme-z (i.e. the mive-z). Ram is 4x4GB DDR3-2133 that I'm running as DDR3-1866.
So here's my conundrum. I can OC pretty stupid easy to 4.8GHz. Using AI Suite from within windows I just up the multiplier and bump CPU voltage as needed to be stable.
At 4.8GHz I need 1.4V (1.406 per multi-meter) and my temps peak at 80C under LinX. Stable for 20 runs (just the longest I tested).
However, regardless of voltage (I've gone up to 1.5V) I cannot set the multiplier to 49x without the computer immediately locking up (even though it is idling).
It seems odd that the chip is LinX stable at 4.8GHz with 1.4V at 80C and yet I cannot even get it to idle at 4.9GHz with 1.5V at 28C. I expected a less sharp threshold before this thing stopped scaling the clockspeeds.
So I am wondering if there other settings I should be paying attention to when I'm overclocking this 2600K on the mive-z.
Just poking around the bios, here's some items that jump out at me for which I have no solid idea what they are or what they do:
FWIW, not sure if this is related to my 4.9GHz barrier issues, the reason my ram is only at DDR3-1866 despite being rated as DDR3-2133 is because I can't get my rig to run the ram stably at DDR3-2133.
Not even as single sticks, regardless of the specific dimm slot I use, even if I bump up the Vdimm (they are 1.5V sticks). I rma'ed the first set after the GSkill tech support team had me troubleshoot them and they concluded the sticks must be bad, but the replacement sticks (retail packaged, different S/N's, not refurbs and not my same old sticks) behave the exact same way, leaving me to conclude either my mobo or my cpu just can't do DDR3-2133 speeds reliably.
My mobo is the Asus maximus IV extreme-z (i.e. the mive-z). Ram is 4x4GB DDR3-2133 that I'm running as DDR3-1866.
So here's my conundrum. I can OC pretty stupid easy to 4.8GHz. Using AI Suite from within windows I just up the multiplier and bump CPU voltage as needed to be stable.
At 4.8GHz I need 1.4V (1.406 per multi-meter) and my temps peak at 80C under LinX. Stable for 20 runs (just the longest I tested).
However, regardless of voltage (I've gone up to 1.5V) I cannot set the multiplier to 49x without the computer immediately locking up (even though it is idling).
It seems odd that the chip is LinX stable at 4.8GHz with 1.4V at 80C and yet I cannot even get it to idle at 4.9GHz with 1.5V at 28C. I expected a less sharp threshold before this thing stopped scaling the clockspeeds.
So I am wondering if there other settings I should be paying attention to when I'm overclocking this 2600K on the mive-z.
Just poking around the bios, here's some items that jump out at me for which I have no solid idea what they are or what they do:
VCCSA/IO - defaults to 1.050 V
CPU PLL - defaults to 1.800 V
PCH - defaults to 1.060 V
PCH PLL - defaults to 1.060 V (this is a separate entry to the PCH above)
NF200 - defaults to 1.20575 V (why it is specific out to the 5th decimal is beyond me)
So...am I supposed to be bumping any of these up as attempt to get this thing to 5GHz?CPU PLL - defaults to 1.800 V
PCH - defaults to 1.060 V
PCH PLL - defaults to 1.060 V (this is a separate entry to the PCH above)
NF200 - defaults to 1.20575 V (why it is specific out to the 5th decimal is beyond me)
FWIW, not sure if this is related to my 4.9GHz barrier issues, the reason my ram is only at DDR3-1866 despite being rated as DDR3-2133 is because I can't get my rig to run the ram stably at DDR3-2133.
Not even as single sticks, regardless of the specific dimm slot I use, even if I bump up the Vdimm (they are 1.5V sticks). I rma'ed the first set after the GSkill tech support team had me troubleshoot them and they concluded the sticks must be bad, but the replacement sticks (retail packaged, different S/N's, not refurbs and not my same old sticks) behave the exact same way, leaving me to conclude either my mobo or my cpu just can't do DDR3-2133 speeds reliably.
