Cant get over 4ghz,

[jj05y]

Hey,

just wondering has any one had any success geting an i7 940 (2.933ghz) over 4ghz? its sitting fine at 4, and the voltage set in the bios to 1.35

and at full load everest ses its at 1.37,

using 21*191,

i dont wanna push the volts into the red,,,

 

[DeMoB]

Seen as though you've got a watercooled setup, it'll go some way to letting you get away with more voltage than just an air cooled setup would.

What sort of temperatures are you seeing at 4Ghz?

Dan

 

[jj05y]

hey, em

its idling at bout 30c n load about 40c, not bad at all,

is the voltage capped at 1.375 because of heat issues?

'http://www.cpu-world.com/CPUs/Core_i7/Intel-Core%20i7%20I7-940%20AT80601000921AA%20(BX80601940%20-%20BXC80601940).html'

i thought that the higher voltage would damage the cpu?

how far could it go? 1.4? i'd want it to be 24/7 stable,,

cheers,

 

[DeMoB]

To some extent it is capped for heat issues (I mean, look how much voltage extreme overclockers can use on sub zero cooling when overclocking), but there are other factors at work than just heat.

The "up to 1.375v" is actually the highest stock voltage that the core i7 920 comes with, not it's maximum for safe operation.

Someone did manage to find this over on another forum:

(Page 22 of this spec sheet whitepaper)

And it shows the max voltage as being 1.55v.

Personally I'd recommend a maximum of 1.4v if you really want to push this as high as you can for 24/7 use. Go by what you are setting in the BIOS rather than what software programs read it as (it's more accurate). If you decide you still don't want to go over official stock voltages (and into the red), then you do have a little room to add more voltage.

Dan

 

[jj05y]

k, cheers, looks promising,

changed to 200*21 (4.2ghz) n uped the voltage to 1.375,

it booted n then blue screened when i tried to open something,

then up the voltage to 1.39 n it blue screened straight away,

what up with that?

whats the difference between channgin the multiplier, or the base clock?

do they have different effects on the voltage requirments?

also the bios ses that the required memory speed is bout 1600mhz to run

the 200*21, is that not huge? could the ram have been what caused the BSOD?

all the ram timings are on auto,

thanks agian,

Joe,

 

[DeMoB]

You can only change the multiplier above the normal value (21 on yours) on Extreme Edition CPUs, so it's a mute point on your CPU. But multiplier overclocking does mean you don't have to push your motherboard as hard and it can be easier to get high overclocks (CPU voltage is going to be pretty much the same either way I would have thought).

What speed is your memory rated at? And what speed is it set to run in the BIOS? Had you previously run memtest86+ on your memory when you were at 4Ghz to make sure it was stable at running at that speed before?

Dan

 

[GavX]

Yeah my Q9450 has a max "Intel" voltage of 1.375, you will need to get above that for a decent overclock, I run 1.55 for 3.85, sadly I cant get above that