Overclocking in progress - a few questions

Troezar

Troezar

Troezar

Soldato
Joined
6 Aug 2009
Posts
7,276
Evening all, Happy New Year!

Finally, a bit late I know but trying to get a decent stable overclock on my i5 2500K to see me through to Skylake or whatever AMD manage to cook up with Mantle and Excavator(?), 2015 could be interesting :)

Anyway I digress, questions are:

1, Currently at 4.5GHz manual CPU voltage at 1.32v but CPU-Z reports 1.368 under 100% load (Prime 95 Blend). Is that normal? How do I lock it down or don't you?

Settings below for P67-GD65 B3 motherboard:

XMP - Disabled
CPU v - 1.32v
CPU Ratio 45
vdroop - low (default is Auto)
EIST(Speedstep) - enabled
C1E - Enabled
CPU I/O Voltage(VTT?) - 1.05v
Spread spectrum - enabled
Overspeed protection - disabled (manual says disable if overclocking)
DRAM volts - 1.507
DRAM Frequency - manually set to 1600MHz
PLL Overvoltage - enabled

2, Max-Min core Temp under 100% load 67°C-58°C

3, Ultimate aim is to sqeeze out as much stable performance as I can, mostly for a renewed interest in PC gaming. Currently trying out BF4 after a nice person on the MM sold me a code :)

Any help is greatly appreciated, if you need more info just ask.
 
The jump from 1.32v to 1.36v is down to the loadline calibration setting

Try with CPU offset voltage at +0.020 and maybe low to high llc,then see what load CPU v is while stressing,if around 1.36v it higher adjust CPU offset to +0.010v and retest
 
Thanks,unfortunately this board only seems to have Auto or low for LLC and I don't think it has an offset voltage setting. Seems like Gigabyte or Asus may be better choices in the future for overclocking? I'm wondering if this board needs to be set lower for cpu voltage i.e. 1.3v and then LLC will increase by 0.2v less?

Currently idling at 1.328v in CPU-Z and 1.6GHz. About 28°C ambient and highest core idles at 33°C. Max core temp playing BF4 was 67°C.


On a plus point it seems stable enough at the moment BF4 is now working fine once I realised that Afterburner had been turned off auto fan speed. GPU now caps out at around 70°C. Would be nice to just get that core voltage down a touch. I presume it will, at least on this board, always stay at the minimum of the voltage I set in the BIOS even when downclocked at idle?
 
Yh I only took a quick glance at your board,I thought it was an asus not msi

Msi doesn't have the CPU offset features so the best you can do is set a manual voltage,tried with lower CPU v? It depends on each chip on how much voltage you need for stability

I'm at 1.344v with a 2600k at 4.5ghz
 
I'll give a lower voltage a go tomorrow but looks reasonably promising that the chip is not too bad. As I understand it there isn't much to be gained in going much above 4.5GHz on Sandybridge for gaming?
 
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