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Interesting (to me) 2600k voltage result

post #1 of 11
Thread Starter 
So, I made a few adjustments to BIOS as per this post by Asus' Juan Jose (namely changing VRM freq to 350 and setting LLC, Phase Control and Duty Control to extreme). Also, I plugged in 1.55 on the CPU PLL Voltage as I read that could possibly lower temps and / or required CPU Voltage for a stable OC.

I was running those settings with manual CPU voltage of 1.26 (down from 1.275 prior to those changes I mentioned, so they did help me lower CPU volts for stable OC) and a 4.5ghz OC. This I ran overnight on prime95 small FFTs and was stilling running this morning, hitting a max temp of 67C with my Mugen 2.

As a test, I then went in to BIOS and changed CPU Voltage to Offset and set it to 0.020 volts. Changing nothing else I booted into Win7 and loaded HWMonitor, RealTemp & CPU-Z... I started prime95 small FFTs....

CPU Voltage jumped to 1.42 and it hit 75C and was still climbing when I stopped the test. I know it was still reasonably safe, but I didn't like what it was doing.

With my very limited experience with this now, I had somewhat guessed that if my manual voltage worked @ 1.26, in offset it should still use around the same voltage... Can someone explain why it went all the way up to 1.42? Because of the LLC, Phase Control & Duty Control settings, or...?

As an aside, I went back in and changed CPU Voltage to 1.285 and am currently running at 4.6ghz as I write this... 40 minutes in prime95 small FFTs & max temp of 71C... min VCore according to HWmonitor is 1.26v, max 1.30v, cpu-z showing 1.280 - 1.296... so far I like it.

My goal is the best OC I can manage while staying low to mid 70s just to be safe for now. I will try for 4.7ghz later tonight, but I don't know how much more voltage that's going to take (or heat it's going to produce).

Batch L040B698, btw...
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post #2 of 11
HOLD ON

If you're going to use offset voltage, on the new ASUS bios, you MUST change 'auto' to 'enable' on c3, c6, and and other one

ALSO, do NOT use LLC with offset voltage, set it to 'regular' or else there are conflicting voltage compensation methods being used and you end up with a crazy high voltage (as you saw)

I run at 4.6 and my voltage offset is 0.065, which gives me 1.312 at load.
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post #3 of 11
Yeah, for some reason the voltage scales up a ton when you run offset + LLC and if you try to compensate by lowering the offset, you BSOD because the idle voltage goes too low.

Personally I've opted to not using LLC entirely since it seemed to drive my temps up compared to running it without.(Same voltages reported)
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post #4 of 11
Thread Starter 
What temps are you getting @ 4.7ghz with 1.34v? What are the rest of your settings?

And thanks for the insight, I knew it was probably me being dumb as to why it did that, not the hardware's fault!

edit to add: I am still using 1053 bios
Edited by DeltaVictor81 - 1/21/11 at 11:30am
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post #5 of 11
Quote:
Originally Posted by DeltaVictor81 View Post
What temps are you getting @ 4.7ghz with 1.34v? What are the rest of your settings?

And thanks for the insight, I knew it was probably me being dumb as to why it did that, not the hardware's fault!

edit to add: I am still using 1053 bios
62-63C load at 4.7/1.34v

Bios 1253
EPU: Enabled/Auto
DRAM: 1950MHz 9-10-9-27-2T
LLC: Auto
VRM Frequency: Auto
VRM Phase: Extreme
Duty Load: Extreme

Need any other info or..?
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by LethalRise750 View Post
62-63C load at 4.7/1.34v

Bios 1253
EPU: Enabled/Auto
DRAM: 1950MHz 9-10-9-27-2T
LLC: Auto
VRM Frequency: Auto
VRM Phase: Extreme
Duty Load: Extreme

Need any other info or..?
Hm... what's your ambient temp? What are you stress testing with?

With your settings I hit 75C in the first 10 minutes running prime95 with your settings (22C ambient).

Scythe mugen 2 vs cm hyper 212 shouldn't be far apart...?
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post #7 of 11
Quote:
Originally Posted by DeltaVictor81 View Post
Hm... what's your ambient temp? What are you stress testing with?

With your settings I hit 75C in the first 10 minutes running prime95 with your settings (22C ambient).

Scythe mugen 2 vs cm hyper 212 shouldn't be far apart...?
Ambient is about 65F or so.
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post #8 of 11
Thread Starter 
Only about a 4C difference in ambient and I hit 77C max during 1 hour prime95... still about a 10C difference between your setup and mine for same settings
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post #9 of 11
Thread Starter 
Here's another thing... I tried to bump it up to 4.8ghz at that same settings (since I know all chips are not equal) and was watching it run prime95... of course I got a BSOD with a 101 error code. (Increase core voltage?)

The part I don't understand is, even though it was set at 1.34v, when the BSOD happened, I was only at 1.32v (according to CPU-Z & HWmonitor)... so Core Voltage WAS set higher, but it wasn't getting that voltage...
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post #10 of 11
Quote:
Originally Posted by DeltaVictor81 View Post
Here's another thing... I tried to bump it up to 4.8ghz at that same settings (since I know all chips are not equal) and was watching it run prime95... of course I got a BSOD with a 101 error code. (Increase core voltage?)

The part I don't understand is, even though it was set at 1.34v, when the BSOD happened, I was only at 1.32v (according to CPU-Z & HWmonitor)... so Core Voltage WAS set higher, but it wasn't getting that voltage...
Yeah that's called vDroop or vDrop, load puts more strain on the regulators which turns into lower voltage than assigned. Also hardware isn't perfect which is why LLC was included. LLC helps to try and eliminate vdroop and vdrop.
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