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Intel EIST, C1E and undervolting

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March 2, 2011 6:02:00 PM

Hi all,

For the past week or two I have been overclocking my processor, an Intel E6500, and then running Prime95 at night to test the stability. I've gotten the processor up to 3.6GHz at stock voltage (1.2875V). I'm not sure that I want to try and overclock any higher. So, for the hell of it last night I undervolted the system to 1.281V and it was Prime95 stable for 12 hours. To be honest I am shocked that I have gotten a %22 freguency increase and it's stable while being undervolted.

Anyways, the reason for my posting was since I have undervolted to 1.281V I've noticed that when EIST and C1E kick in they no longer lower the voltage. Before, at idle my computer would lower the multiplier to 6, which would give me 1.96GHz and voltage would be around 1.072V according to CPU-Z. But now that I have undervolted the voltage stays at 1.248V in CPU-Z whether it is at idle or full load (discounting Vdroop).

My question is, is there a way to get EIST and C1E to lower my voltage at idle even though I have undervolted my processor? Or, should I put the voltage back to stock to enjoy less heat?

My system:
Motherboard: Gigabyte GA-G31M-ES2L Rev. 2.4
Processor: Intel Pentium Dual-Core E6500 @ 3.6GHz
Memory: 4GB Corsair XMS2 DDR2-800 @ 984MHz
Video card: HIS Radeon HD4670 Turbo

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March 2, 2011 10:06:18 PM

No. All of that depends on both the motherboard and the BIOS.
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March 2, 2011 10:46:37 PM

I went into the BIOS disabled both EIST and C1E, booted Windows up and then went back into the BIOS and turn them both back on. No dice. I suppose I'll go back to stock voltage then.
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March 2, 2011 10:46:46 PM

Best answer selected by CorsairFreak.
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