3570K stock voltages?

[PowerPie5000]

Does anyone know roughly what the stock idle/load voltages are for the 3570K? Everything in my bios is set to 'auto' and i noticed the CPU runs at 1.250V under load, which seems high considering the i5 2500 in my girlfriends rig runs at 1.200V under load. The idle voltage for my CPU is 1.080V (my partners i5 2500 idles at 0.995V).

My motherboard is a Biostar TH67XE with the latest bios update. The CPU is set to 'SPEC Voltage' within the bios (default setting)... Other options include 'AUTO', 'OFFSET Mode' and 'FIXED Mode'. Should i leave it as it is?

[Samwood]

That sounds ok to me. Stock voltage varies slightly for each motherboard (AFAIK).

Are you running it at stock speeds? i.e. no overclock?
If so, I would change it to 'FIXED mode' and set the voltage to 1.200V. Then run a quick stress test (i.e. Prime 95) to check that its stable.
You might be able to drop the voltage to around 1.100V (stress test to check), which will lower your power usage, but (based on the results with my 3770k) anything lower than 1.100V makes little or no difference to power usage or temps.

[PowerPie5000]

Thanks for the reply... It seems the voltage doesn't drop when idle in 'FIXED Mode' . I'm not doing any overclocking (H67 chipset).

[Willzzz]

Well over at Anandtech they showed that you can run at stock on 0.9v and that this does help with temperatures and presumably power.

http://www.anandtech.com/show/5763/u...-on-ivy-bridge

You may get different results of course.

[PowerPie5000]

Well over at Anandtech they showed that you can run at stock on 0.9v and that this does help with temperatures and presumably power.

http://www.anandtech.com/show/5763/u...-on-ivy-bridge

You may get different results of course.

I might have a fiddle at lowering the voltages as this chip does run a bit warmer than my girlfriends i5 2500 (using the same model cooler and type of thermal paste).... That's a 22nm/77W chip running hotter than a 32nm/95W chip - both at stock speeds! Go figure

Is the CPU voltage already set/coded in the motherboards bios, or does it retrieve this info from the actual CPU?

[Willzzz]

I think the MB makes a best guess at what the CPU needs, although obviously it will play safe, very safe in some cases.

When I added a mild overclock to my CPU the MB decided to add extra voltage which it just didn't need.

[GeorgeStorm]

As far as I'm aware, different chips will have slightly different stock voltages, all within the VID of the chip.

Here's a relatively simple explanation: (also the first link I found )
http://www.overclock.net/t/665362/vi...tion-explained

[Samwood]

I might have a fiddle at lowering the voltages as this chip does run a bit warmer than my girlfriends i5 2500 (using the same model cooler and type of thermal paste).... That's a 22nm/77W chip running hotter than a 32nm/95W chip - both at stock speeds! Go figure

Is the CPU voltage already set/coded in the motherboards bios, or does it retrieve this info from the actual CPU?

Intel changed the solder for Ivy Bridge, which (apparently) changed the thermal characteristics of the CPU. Rumor has it that it is either due to the brittle nature of the new Tri-gate transistor, or to make Haswell (the next generation of Intel Core CPUs) look better on release.

Bit more info here:
http://hexus.net/tech/news/cpu/45489...rs-ivy-bridge/
http://hexus.net/tech/news/cpu/39369...-material-tim/