I7 overclock

newbcake

newbcake

newbcake

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Joined
18 Mar 2009
Posts
79
hey guys, i got my 920 to 4.0ghz but its only stable in IntelBurn test and OCCT tests.
When i run prime95, it crashes within 20 minutes.

Is this a sign of instability?

Mobo = gigabyte ud3r
Ram = Patriot 6gb

Vcore 1.35v (will lower when i get 100% stable)
QPI 1.335v
IOH 1.10V
DDR 1.64v

thanks
 
Try running Prime95 at stock speeds, if it passes for more than 20mins then you have confirmed your overclock isn't stable.
 
newbcake said:
hey guys, i got my 920 to 4.0ghz but its only stable in IntelBurn test and OCCT tests.
When i run prime95, it crashes within 20 minutes.

Is this a sign of instability?

Mobo = gigabyte ud3r
Ram = Patriot 6gb

Vcore 1.35v (will lower when i get 100% stable)
QPI 1.335v
IOH 1.10V
CPU PLL: 1.840v
DDR 1.640v

thanks
Click to expand...

Try this:

Vcore at 1.26250v
QPI: 1.240v
IOH: 1.220v
CPU PLL: 1.840v
DDR 1.640v
 
Last edited:
robmagee said:
What speed you running that ram at?
Click to expand...

RAM = x8, (its around 1500 mhz)

i've been playing around, and its stable for 2+hours on prime with these settings
Bumping up the ram voltages helped. but its 0.1v over the threshold, would this be considered as safe?

Vcore = 1.35v
QPI = 1.335v
IOH = 1.14v
Ram = 1.66v
 
and just a further note. my Vcore seems a lot higher than most posters on this site.

Although im only hitting max temps of 78, would you consider lowering this voltage?
 
lower it as far as you can in small increments then run some more tests,get it as low as possible while keeping your pc stable
 
newbcake said:
RAM = x8, (its around 1500 mhz)

i've been playing around, and its stable for 2+hours on prime with these settings
Bumping up the ram voltages helped. but its 0.1v over the threshold, would this be considered as safe?

Vcore = 1.35v
QPI = 1.335v
IOH = 1.14v
Ram = 1.66v
Click to expand...

ram is fine as my Asus board only has 1.64 or 1.66 to choose from so i run it @ 1.66v.

can you not set the xmp profile within the bios to get the best setting for your ram?

as for Vcore you shouldn't really need to go over 1.3v for 4ghz. i'm @ 1.296v @ 4.2ghz
edit: assuming your using a D0 stepping chip
 
magicroundabout said:
ram is fine as my Asus board only has 1.64 or 1.66 to choose from so i run it @ 1.66v.

can you not set the xmp profile within the bios to get the best setting for your ram?

as for Vcore you shouldn't really need to go over 1.3v for 4ghz. i'm @ 1.296v @ 4.2ghz
edit: assuming your using a D0 stepping chip
Click to expand...

hey thanks for the tips and yea my chip is DO

Not sure what you mean by xmp profile in bios.:confused:

my question: is IntelBurn Test a reliable stability test?
my cpu always stable with it, but not 100% with prime95

thanks
 
newbcake said:
hey thanks for the tips and yea my chip is DO

Not sure what you mean by xmp profile in bios.:confused:

my question: is IntelBurn Test a reliable stability test?
my cpu always stable with it, but not 100% with prime95

thanks
Click to expand...


XMP = http://www.intel.com/assets/pdf/whitepaper/319124.pdf

There should be a section in your bios called: Extreme memory Profile
Looks like this i think

bios_select_xmp.jpg


turn it on and your ram will be running 1600mhz @ 8-8-8-24
 
The XMP profile won't work on my D0 Stepping CPU even though it was fine on my C0 stepping I7.

It may be because I am being too tentative with the voltages, as XMP needs minimum 1.65v ddr and 1.3v QPI. I am not sure how far above this I can go as the voltages seem a little high for a D0 Already.
 
Dr Who said:
The XMP profile won't work on my D0 Stepping CPU even though it was fine on my C0 stepping I7.

It may be because I am being too tentative with the voltages, as XMP needs minimum 1.65v ddr and 1.3v QPI. I am not sure how far above this I can go as the voltages seem a little high for a D0 Already.
Click to expand...

what exactly determines what the threshold is for safe voltages?

at 1.35v, my cpu temp never hits 80. it just peaks at 78.
 
Well intel have said that high ram voltages will damage the memory controller on the cpu. However, XMP is an intel spec, and specifies 1.65ddr and 1.35qpi...

I guess I need to read some of their tech specs to make sure...
 
Just to let you know when your system crashes , if you get BSOD 101 you need to increase your vcore.......if you get BSOD 124 you need to increase CPU VTT voltage.
As regarding Interburn, I used it to test my system and it was all fine but then i used Linx and it crashed. Guess trying as many different programs is the safest option
 
thanks for the tips

im concerned about my high Vcore voltages. its not stable even at 1.35v.

i've been playing around with the ram multiplier, now set at 6.

It seems more stable now, running at 3.7ghz with 1.3v vcore.

Question: dropping the ram multiplier slows down my ram, would this affect my performance dramatically?
 
Just an update guys

Finally got a stable OC at 3.906ghz. passed 20 linx passes and few hours of prime95.

settings are:
cpu clock ratio :20
Turbo : on
Qpi: x36
Uncore: x16
BCLK: 186
Mem multipy: x8

Vcore: 1.34v
QPI: 1.335v
IOH: 1.26
VDram: 1.66
PPL: 1.86v


If i try BCLK at 191, i have to raise my Vcore at around 1.37 and temps go crazy high.
I know its only 100mhz, but i really want the 4ghz, its more of a mental fing than anything else
 
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