OC 4.2ghz I7 950 sapphire pureblack x58 ci vuole troppo vcore, aiuto.

Le085

Hello.

4,2 GHz is a quite high frequency for a daily use. Try to decrease a little bit the frequency in order to reach the stability with 1,3V or 1,35V of vcore

Which is you CPU cooler?

tom1

yes but as said leo try to decrease the frequency across molti and because i said x20

Xoriam

Le085 ha scritto:

Hello.
4,2 GHz is a quite high frequency for a daily use. Try to decrease a little bit the frequency in order to reach the stability with 1,3V or 1,35V of vcore

Which is you CPU cooler?

My cooler is Corsair H80, my tempuratures are good.

tom1

well, try our suggestions

Xoriam

ok brb

tom1

update us on developments

Le085

Xoriam ha scritto:

My goal is to lower vcore not to lower the overclock
Usually I7 950 needs 1.3-1.35vcore to hit 4,2ghz

With 1.45vcore I should be able to OC 4.5-4.8ghz

It seems to me that is an estimation a little bit too optimistic! The i7 950 is not a Sandy Bridge !

In any case each CPU has a different behavior, and the optimal settings should be found manually.

4 GHz is generally a good trade-off.

Xoriam

Ok I'm back already, this cpu does not like 20x multi XD

20x multi=crash at 1.45v

21x multi=crash at 1.3875 with longer time before crash.

tom1

try to set default settings save and exit from the bios, come back into and up the molti e vcore and tell us.

Xoriam

tom1 ha scritto:

try to set default settings save and exit from the bios, come back into and up the molti e vcore and tell us.

I can get 3.6ghz with about 1.25-1.275

3.8ghz 1.3-1.325

anything beyond 3.8ghz wants alot of voltage.

upping IOH to 1.3 and pcie to 103 I was able to stress test 4.2ghz for a short period of time, which is a bit of an improvement. with vcore 1.3875

Le085

Yep, odd multipliers, if I remember well, are preferred by Nehalem CPUs.

Had you fixed the PCIe frequency before? This is very important when raising the bclk!

Nikolaj

hi man

, i ll write to you in english because of you're in need to understand correctly.

If you can, send me an image of your bios settings, for example a direct photo. Otherwise report them all in your first page.

Have you got something called qpi/dram or just LLC ?

I highly suggest you to set a voltage lower, or equal, than 1.35/1.38V.

Some tips:

use multi 21x

set a dram value lower than 1600, with relaxed timings and 2T command rate

You should turn off a lot of other settings but you should show me the situation

Achieving such high frequency on a nehalem processor it requires a motherboard with digital phases, lots of ventilation in the NB/SB and VRM's, a very good CPU (yours could have some issues, past 4.1GHz) and a good PSU. What have you got regarding the last one ?

Thanks in advance

Xoriam

Nikolaj ha scritto:

hi man
, i ll write to you in english because of you're in need to understand correctly.

If you can, send me an image of your bios settings, for example a direct photo. Otherwise report them all in your first page.

Have you got something called qpi/dram or just LLC ?

I highly suggest you to set a voltage lower, or equal, than 1.35/1.38V.

Some tips:

use multi 21x

set a dram value lower than 1600, with relaxed timings and 2T command rate

You should turn off a lot of other settings but you should show me the situation

Achieving such high frequency on a nehalem processor it requires a motherboard with digital phases, lots of ventilation in the NB/SB and VRM's, a very good CPU (yours could have some issues, past 4.1GHz) and a good PSU. What have you got regarding the last one ?

Thanks in advance

Hey,

my qpi/dram is called CPU VTT which i currently have set at 1.3, the safe voltage for i7 950 CPU VTT is 1.45 before it actually needs a specific cooler for it.

I'm personally not having any trouble at getting stable 4.2ghz or even 4.8ghz, its just the fact that it wants alot more vcore than it actually should. and it would be nice to bring it down or get more speed from the current setting.

I will list to you all of my voltage possibilities

LLC

CPUVcore

DIMM

CPU VTT

IOH Vcore

QPI PLL

IOH/ICH IO voltage

CPU PLL vcore

ICH vcore

DIM DQ VREF

Xoriam

Le085 ha scritto:

Yep, odd multipliers, if I remember well, are preferred by Nehalem CPUs.
Had you fixed the PCIe frequency before? This is very important when raising the bclk!

Yep Nahalem likes odd multis ^^

Xoriam

so here are the exact settings on everything

cpu 200x21 =4200

ram 2:8 to achieve 1600mhz 9-9-9-24-2t

qpi - 4.800gt link speed full speed

pcie freq 103

Uncore x16 or x18

all powersaving off

voltages

LLC 100%

CPUVcore- 1.3875 (which should be more than enough for 4,2ghz on d0 step i7 950)

DIMM- 1.65

CPU VTT 1.35

IOH Vcore- 1.3

QPI PLL 1.35

IOH/ICH IO voltage- auto

CPU PLL vcore- stock is 1,8 tried bringing up to 1.9 and 2.0 didnt see a diffrence, at 1.6 i saw a slight change but it might have just been a flook

ICH vcore- auto

DIM DQ VREF- auto

i've changed every setting possible now, so I'm starting to think this chip just won't accept anything under 1.45vcore.

which would suck because that means my highest possible OC is a 4,4ghz before voltages start to become dangerous.

Nikolaj

Xoriam ha scritto:

so here are the exact settings on everything
cpu 200x21 =4200

ram 2:8 to achieve 1600mhz 9-9-9-24-2t -> set a lower one, same timings

qpi - 4.800gt link speed full speed

pcie freq 103->101

Uncore x16 or x18

all powersaving off

voltages

LLC 100%

CPUVcore- 1.3875 (which should be more than enough for 4,2ghz on d0 step i7 950) -> it could, not should

DIMM- 1.65

CPU VTT 1.35

IOH Vcore- 1.3

QPI PLL 1.35

IOH/ICH IO voltage- auto -> should be low, if i remember correctly something like 1.18V. I should check the old bios

CPU PLL vcore- stock is 1,8 tried bringing up to 1.9 and 2.0 didnt see a diffrence, at 1.6 i saw a slight change but it might have just been a flook -> no more than 1.86V !! Be careful

ICH vcore- auto

DIM DQ VREF- auto

i've changed every setting possible now, so I'm starting to think this chip just won't accept anything under 1.45vcore.

which would suck because that means my highest possible OC is a 4,4ghz before voltages start to become dangerous.

I'll check the blue ones tomorrow

I think that you could have got a bad CPU, but I need to check better your mobo

Xoriam

Nikolaj ha scritto:

I'll check the blue ones tomorrow
I think that you could have got a bad CPU, but I need to check better your mobo

Yep I'm pretty sure it is the chip as well, highest vcore i've seen needed for even a 4.3ghz oc which is higher then mine with a I7 950 on my motherboard is a 1.3875, most others were 1.31-1.35

This chip really just doesn't care what voltage I throw at it..

It just says give me more vcore.... -_-

luckily my temperatures are ok, but i really wanted to optimize.

Xoriam

UPDATED:

EDITED turns out Sapphire likes to put their LLC options backwards to confuse you!

Here are my new GOOD settings, I mean I bought this board on purpose lol....

:perfido: now thats more like it!

oh yeah I was stable at 4ghz 1.2vcore flat.

Target CPU frequency- 4200mhz
Target memory frequency- 1600mhz
Cpu freq- 200
Cpu Ratio- 21
Memory frequency- DDR-1066 2:8
Memory timing- By DDR 1600mhz 9-9-9-24-2t
Uncore- slight oc to x18
PCIE frequency 101
Vcore- 1.2875
VDIM- 1.65
CPU VTT- 1.35
IOH- 1.3
QPI PLL- 1.35
LLC- DISABLED :bang head
All powersaving options disabled
Max load temp in P95- 75c

Nikolaj

all right then. My suggestion ? Keep it like this, and forget.

You've got a Nehalem at 4.0GHz, it's a lot, with a very good voltage and in stability.

Great job

Xoriam

Nikolaj ha scritto:

all right then. My suggestion ? Keep it like this, and forget.
You've got a Nehalem at 4.0GHz, it's a lot, with a very good voltage and in stability.

Great job

Thanks alot! it was alot of work to find the small problem. But in the end it's good!