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i7 3820 stock core voltage?

post #1 of 12
4/11/12 at 3:31am
Thread Starter 
I've got an Alienware Aurora R4 with an i7 3820 at stock speed but CPU-Z is telling me the core voltage is 1.392 V which to me seems way too high for a 3820 running at stock speed.
I've checked the bios and it seems the core voltage can be set in "Dynamic CPU Vcore Offset (20H Out1)". This is set to Auto but I can choose from a wide range of voltages there. Does anyone know what "Dynamic CPU Vcore Offset (20H Out1)" means? And what value should I set there to use a more reasonable voltage?

Thanks in advance
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post #2 of 12
4/11/12 at 4:15pm
This should help you out:

i7 3920 CPU-WORLD
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post #3 of 12
4/11/12 at 4:41pm
Thread Starter 
Thanks!
Well, I don't know who came up with the idea to crank up the core voltage so high but I'm not really happy with it. Like I said, it's 1.392 V and sometimes even 1.4 V. Idle core temps are around 40 degrees C and around 75 C when running Prime. And it seems there's no way I can lower the setting because they just left that out of the bios.
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post #4 of 12
4/11/12 at 5:07pm
Whats the motherboard model? Anyway to take a pic of the voltage adjustments in the BIOS?
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post #5 of 12
4/12/12 at 6:54am
Thread Starter 
Sure, here are some pics. But I'm affraid the option to change core voltage has been left out of the bios to avoid noobs frying their CPU frown.gif

382

381

389
Nisei
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post #6 of 12
4/12/12 at 9:51am
Tried updating the bios?
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post #7 of 12
4/12/12 at 12:40pm
Thread Starter 
Nah, already got the latest.
It's just Alienware who don't want their customers to mess with the vcore.
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post #8 of 12
4/12/12 at 4:26pm
I have an Asus Sabertooth X79 and just reset my BIOS to 'default' values to compare with you. I'm getting 1.256v at full load (P95 blend) at stock speeds (well 3.7GHz as TurboMode is on by default).

404

At idle I was getting 1.05v but that will be due to the fact SpeedStep is on by default in my BIOS.
Edited by estebanrey - 4/12/12 at 4:28pm
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post #9 of 12
4/12/12 at 5:01pm
Thread Starter 
Thanks for testing, I appreciate it.
Well, speedstep is also active on my system. It's actually 1.392 V to 1.4 V when idle and at 1200MHz so it doesn't seem to be a default voltage. It really baffles me why they cranked it up this much but it's probably the highest possible voltage they could apply and let people do the rest of the overclocking themselves. But for a system at stock speed it's ridiculous and a waste of electricity.
Mind you, the liquid cooling can cope with it but the system fans are kicking in much sooner than they would when Dell woud've used a vcore of say 1.3V.
I've tried a little overclocking to 4GHz and core temps are already shooting up to 75C when running P95 so I guess if I go higher all fans will go nuts and I'll be sitting next to a wind tunnel.
Are there perhaps any people on these forums who can hack a bios and make hidden options visible?
Edited by Nisei - 4/12/12 at 5:13pm
Nisei
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Nisei
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post #10 of 12
4/13/12 at 5:30am
No problem Nisei but I'm confused by your reply as my stock voltage is much lower than yours which would indicate maybe something is up your end rather than your voltages being standard manufactirer settings.

Edit: By 'they' I assume you mean Alienware?
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