E6850 limit

TK421 · 20 Nov 2008 at 19:35

when trying 4ghz.. i cant boot into windows with the odd BSOD. i am feeding the cpu with 1.511volts is this enough... how do i know i am not going to **** it up by giving it more juice. i can boot into windows at 3.9 and complete benchmarks with 1.49 volts.. or is it the ram hitting its ceiling at 890 at 1:1 at 4ghz? :confused:

Devil_Spawn · 20 Nov 2008 at 19:36

afaik, that is way to much voltage for a 45nm cpu, drop to 1.4v max

Tetsu · 20 Nov 2008 at 19:39

That chips a 65nm

TK421 · 20 Nov 2008 at 19:40

Tetsu is right my friend..

divuk83 · 20 Nov 2008 at 19:41

I still think 1.5 volts is a bit much if you only have an AC Freezer pro to cool things.

Dave

TK421 · 20 Nov 2008 at 19:47

hitting 64-65c under load at 3.9 and idling at 33c... hitting 4ghz is for self satisfaction

not 24/7 use...

divuk83 · 20 Nov 2008 at 19:57

Interestingly I get a higher idle temp than you but my temps are lower under load, though thats probably down to the poor design of my case.

Have you tried slackening the ram timings a bit?

Dave

TK421 · 20 Nov 2008 at 20:04

at 3.9 my ram is 5-6-6-20 2T at 868 mghz.. what do you suggest for 890 mghz.. this is a bit of a grey area for me...

Devil_Spawn · 20 Nov 2008 at 20:22

whoops - saw the 8, dunno what i was thinking *rolls eyes*

mame · 20 Nov 2008 at 20:28

If you tested using a lower multiplier but kept the FSB and 1:1 RAM the same then this should show you if the motherboard or RAM are maxing out.

TK421 · 20 Nov 2008 at 21:08

But if i use a lower multi will this not stress the mb and possibly do damage.. fry the VRM's..

mame · 20 Nov 2008 at 21:12

well generally speaking, a motherboard will max out at a certain FSB, RAM at a certain Mhz and a CPU at it's final clockspeed. By testing with a lower multi you would, in effect, take the CPU out of the equation as far as maxing out goes.

TK421 · 20 Nov 2008 at 21:38

right I lowered the multi to 8x with the fsb still at 445 and mem at 890mghz giving me a 3.56ghz clock.... booted into windows ok but temps are higher with an idle of 35-37c and the voltage in cpu-z is up and down between 1.512 to 1.490 so what does this establish?

mame · 20 Nov 2008 at 22:21

TK421 said:
right I lowered the multi to 8x with the fsb still at 445 and mem at 890mghz giving me a 3.56ghz clock.... booted into windows ok but temps are higher with an idle of 35-37c and the voltage in cpu-z is up and down between 1.512 to 1.490 so what does this establish?

If it is stable at that speed then it means that you know that your motherboard and RAM are fine to run at those speeds so that leaves it down to where your CPU maxes out and what vcore you can use maybe increase this

TK421 · 20 Nov 2008 at 23:38

i will try tomorrow on a higher voltage unless anyone has a different opinion?

TK421 · 21 Nov 2008 at 00:22

it's useless tried all different volts on mostly everything and changed ram timings....still getting the BSOD :mad:

... anyone got any more ideas :confused:

... i have heard of this chip going to 4.25 without water cooling,..

JimAroo · 21 Nov 2008 at 00:29

You might need to up your north bridge voltage a notch.