OC 4.2ghz I7 950 sapphire pureblack x58 ci vuole troppo vcore, aiuto.
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but is instable right ?
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tom1 ha scritto:
but is instable right ?Yes exactly
1,225 I can post
1.3 I can use windows
1.45 stable system
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did you stress the cpu with prime , lynx ?
try with
molti x20
vcore 1.3
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tom1 ha scritto:
did you stress the cpu with prime , lynx ?try with
molti x20
vcore 1.3
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
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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?
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yes but as said leo try to decrease the frequency across molti and because i said x20
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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.
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well, try our suggestions
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ok brb
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update us on developments
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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.
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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.
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try to set default settings save and exit from the bios, come back into and up the molti e vcore and tell us.
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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
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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!
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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
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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
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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 ^^
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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.
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Xoriam ha scritto:
so here are the exact settings on everythingcpu 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
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