Sandybridge overclocking

Vegeta · 29 Jan 2011 at 11:52

Hi just got my new sandybridge setup and i'm a bit confused on overclocking or maybe i'm not as it looks just too goddamn easy?

Anyways don't adjust base frequency (get that) just up multiplier and vcore as usual (get that) but the ram side confuses me.

I've got some G.Skill Ripsawx 12800 stuff and it's running on a multiper of 6 rather than a top of 8 and says effeactive speed of 1600. But in the past the ram synced with the base frequency (fsb?) so do I overclock the ram or leave it as is? And would there be any benefit of getting the faster ram? I don't understand how the ram speeds syncs with the cpu.

johny dolan · 29 Jan 2011 at 12:09

Use the xmp setting if your ram has that it will auto set your ram speed and timings to the correct values for you.

Vegeta · 29 Jan 2011 at 12:35

Ok. But could you explain it to me how they sync i'd rather know.

Vegeta · 29 Jan 2011 at 12:50

Also how does turbo boost affect my overclock? What exactly is turbo boost.

chaparral · 29 Jan 2011 at 13:04

Vegeta said:
Also how does turbo boost affect my overclock? What exactly is turbo boost.

At default clocks the turbo boost kicks the CPU up to 3800mhz (with the i7) when loaded..

(turbo boost is 3700mhz with i5)

chaparral · 29 Jan 2011 at 13:09

Keep a very close eye on the vcore voltage if you overclock by using the motherboard own auto overclock profiles..
As my motherboard was kicking the CPU vcore voltage to high when set to auto

Vegeta · 29 Jan 2011 at 13:12

I'm not going auto overclock. So should I disable autoboost? Because if I overclock my pc to 4.7ghz will it autoclock to a unstable 5.1?

chaparral · 29 Jan 2011 at 14:31

Vegeta said:
I'm not going auto overclock. So should I disable autoboost? Because if I overclock my pc to 4.7ghz will it autoclock to a unstable 5.1?

Think you be best to post what motherboard you have, as every motherboard has different bios settings for overclocking ..

Vegeta · 29 Jan 2011 at 15:35

MSI P67A-C45

I think I know what the difference is between the top motherboards and the lower end ones. The core voltage seems to fluctuate on this board quite a bit - prime tested the cpu at 4.6ghz + 1.28v (1.288-1.304 on CPU-Z) and it was fine for a hour under load, closed prime 95 and I saw the volts/cpu load usage drop on Realtemp/CPU-Z and then my system crashed, i'm guessing after being on load for a hour to suddenly drop load and v core too much made it crash, bit annoying means i'll have to run it at high bolts to make sure that doesn't happen.

Ade74 · 29 Jan 2011 at 16:43

Vegeta said:
MSI P67A-C45

I think I know what the difference is between the top motherboards and the lower end ones. The core voltage seems to fluctuate on this board quite a bit - prime tested the cpu at 4.6ghz + 1.28v (1.288-1.304 on CPU-Z) and it was fine for a hour under load, closed prime 95 and I saw the volts/cpu load usage drop on Realtemp/CPU-Z and then my system crashed, i'm guessing after being on load for a hour to suddenly drop load and v core too much made it crash, bit annoying means i'll have to run it at high bolts to make sure that doesn't happen.

this seems to happen on my p67a g65 too fine when running under load but crashed when i am just using media player or on the internet i had to increase the v slightly higher so it doesnt go so low when idling

Vegeta · 29 Jan 2011 at 16:45

Argh not sure if it is just the vcore now or not. It run's fine under load but crashes when I do random things its annoying as hell and I don't want to keep ramping up the vcore.

chaparral · 29 Jan 2011 at 16:46

I had problems when i first started overclocking my sandy bridge CPU..

I found using a fixed vcore fixed them ..

Try using a fixed 1.335v for 4600mhz

This is mine right now

Vegeta · 29 Jan 2011 at 17:14

I think you'll have spread spectrum enabled for your bios to cpu to be reporting 99.8mhz.

That's a much higher vcore than what the chip requires though it's 4.6ghz stable prime under 1.288 I don't want to have to run it at 1.336V i'll give it a go.

chaparral · 29 Jan 2011 at 17:21

Vegeta said:
I think you'll have spread spectrum enabled for your bios to cpu to be reporting 99.8mhz.

Thanks

Disabled spread spectrum and replaced the cpu-z picture

Vegeta · 29 Jan 2011 at 17:36

How are you keeping the Vdroop? Low or High?

chaparral · 29 Jan 2011 at 19:11

Vegeta said:
How are you keeping the Vdroop? Low or High?

In my motherboard bios i have 5 level settings for Vdroop and i have it set to level 2 or 3 (1 = highest)

Vegeta · 29 Jan 2011 at 19:29

I'm regretting getting a MSI, i've only had one other MSI and that died on me but I thought maybe it's a one off. Now I get these problems with this.

chaparral · 29 Jan 2011 at 19:43

I try take some pictures of my bios settings and post them here..(That if my camera has any battery charge left in it)
Don't know if they be of any help with you having a MSI board

Vegeta · 29 Jan 2011 at 19:47

I don't think i'm doing anything wrong I know what the bios settings mean. I think I may have just got a terrible board to be honest.

chaparral · 30 Jan 2011 at 10:19

Vegeta it looks like someone else had the same problem as you with crashing when idle

Todge said:
Mine exact combo ran at 4.5 on 1.31v happily under load but i kept getting the odd BSOD at idle and didn't have the time to fiddle around with it.

For the P8p67 Pro make sure you have the latest bios, enable Internal PLL Overvoltage, set the voltage at 1.35 and try booting at 4.5 that will probably work nice and easy. Enabling other stuff will help keep it stable and get higher..

http://forums.overclockers.co.uk/showthread.php?t=18235909