Is my RAM limiting my overclock?

Rusty0611

Rusty0611

Rusty0611

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I have Kingston HyperX Genesis Grey 2 * 4GB RAM and I think (!) that it is limiting my overclock. Even with absurd volts going through both my current chip and my old chip I hit a wall where the machine would just not boot. (4.7 Ghz is the wall on this chip, 4.5 Ghz was the wall on my i5 2500k)

I've tried all kinds of of things but the same thing. Boot loop or a boot to the Gigabyte splash screen then freeze.

I'm running the XMP with it undervolted to 1.575. What can I do to help facilitate a higher overclock? Underclock the RAM? Loosen timings?

Not bothered if I need to get some better RAM. If so, please recommend.

I am an absolute newb when it comes to RAM settings, I haven't the foggiest what to change!

Thanks for any help in advance.
 
Well set it up at the correct voltage first. Why undervolt and then ask is it my RAM??? Set it up correctly and then mem test it. After passing memtest at XMP timings and speed you know its not your RAM. Do this with no overclock on CPU.

Keep the same RAM speed then up the multiplier and Vcore accordingly. As you reach your top overclock for that CPU on that cooling you may need to increase IMC volts (VTT) slightly to maintain the stability of the IMC.

Also with SB consider tuning PLL so that you need less overall volts and keep temps lower. Usually a PLL of below stock works well.
 
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Because its rated to run between 1.5 and 1.65. I've tried pushing the overclock higher with the voltage at 1.65 but it made no difference. Temps are fine on the i7 3770k but just won't boot at 4.7 GHz. (this is my current chip)

Would increasing IMC voltage help it to boot?
 
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Possibly yes. VTT is the one your looking at. But its not the RAM at fault for that if your not pushing the RAM mhz or tightening the timings then the limiting factor is the CPU.

With 680 SLI you may also need to adjust VCCSA slightly too. Remember the PCI EX lane controller is on the chip too now so its just as much the SLI likely to be limiting overclock as RAM.
 
That's interesting because I can only get 4.5 Ghz stable with SLI enabled so that definitely sounds like something I need to adjust.

Anything else I should adjust to get it to boot at 4.8?

I had vcore at 1.35 (I think) to get it to boot and it still failed so I gave up. My 4.6 is 1.27 I think....

Will have a dig later tonight in the BIOS.
 
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