i7 920, CPU vcore and dram raised, what next to make 4GHz stable?

Z

Z Overlord

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• Jan 24, 2012

• #1

my Vcore is 1.33 (rounded, too lazy to go into Bios atm), dram is 1.66

Before heading off to school I turned on Prime95, came back 7 hours later to see my screen black (but still on) and PC unresponsive, forcing me to press the power button to turn it off.

~Bios Settings~

CPU CMOS:



Memory settings:



Voltages:

 

Deltafan909

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• Jan 24, 2012

• #2

Post your exact RAM, Motherboard, and if your 920 is C0 or D0 stepping...

If you don't know where to find those, you can just get CPU-Z and post pics of your CPU, SPD, and Mainboard tabs.

After you post these, people can help you more efficiently. Welcome to Overclockers!

 

OP

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• Jan 24, 2012

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• #3

Oh yes, sorry:

 

Deltafan909

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• Jan 24, 2012

• #4

This may or may not be the problem, but one thing that jumps out at me is the QPI Link speed of 7.2GT/s. The stock QPI link speed for the i7 920 is 4.8GT/s. Lower your QPI Clock Ratio...?

 

Mjolnir

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• Jan 24, 2012

• #5

Give the QPI voltage 1.3v + lower the QPI ratio.

 

Neuromancer

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• Jan 24, 2012

• #6

Yup QPI speed should be dropped to lowest levels. 8 GHz is about the best you can expect few do more.

all do 7.2 though... so a little more voltage in that area should be fine.

Also raising NB core might help a bit, not a big deal at 4GHz, but more important later on. And really helps with 3D scores with nothing else changed but IOH core.

 

OP

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• Jan 25, 2012

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Well if you notice on my voltage picture (3rd one), I have QPI/VTT, and QPI PLL, which one do I raise?

And What is the NB called? IOH core?

 

OP

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• Jan 25, 2012

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While I try to figure out what voltages to raise, I'll set my "performance enhance" in the memory setting from "turbo" to "standard". Think that might help?

 

Mjolnir

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• Jan 25, 2012

• #9

QPI/VTT voltage for QPI voltage increase. I'm not sure about that second question though.. If I wasn't busy I'd restart my computer and just give you my settings and see how you go lol.

 

Mjolnir

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• Jan 25, 2012

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Ratio 21
Turbo Power Limit Enabled
Blck 191
PCIE 100
DRAM 1531
Uclock 3063
QPI 6893

CPU LLC Enabled
CPU Differential Amp +700mv
NB OCP Enabled
DRAM OCP Enabled

Extreme OV Enabled
CPU Voltage Control Absolute (VID)
CPU Voltage 1.25v

CPU PLL 1.88v
QPI 1.3v
IOH 1.2v
IOH PCIE 1.5
ICH 1.2v
ICH PCIE 1.5
DRAM 1.65v
CPU spread Disabled
PCIE Spread enabled.
CPU/IOH Clock skew normal


Are all my settings. If that helps you at all..

 

OP

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• Jan 25, 2012

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If I raise my QPI/VTT even a little bit (1.175 to 1.2) I get an instant BSoD upon stress testing.

 

Deltafan909

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• Jan 25, 2012

• #12

Raise it to 1.3

 

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Deltafan909 said:

Raise it to 1.3

Click to expand...

Well in the past when I'd try 1.33 or 1.35 I'd get the same BSoD results, sometimes Windows wouldn't even boot. For like a year now I've learned to never touch that setting.

I will try again when I get home I suppose, but it seems like if that setting will always be a problem, it has been for a long time now.

 

BoT

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• Jan 25, 2012

• #14

i would turn off turbo, leave the clock drive on default and maybe raise vcore to 1.35v

 

OP

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BoT said:

i would turn off turbo, leave the clock drive on default and maybe raise vcore to 1.35v

Click to expand...

As in the "performance enhance" thing in the memory settings

 

BoT

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• Jan 25, 2012

• #16

yap, i actually would turn of the xmp profile too as well as leave dram voltage on auto unless thats the reason why you experience instability.
get the cpu stable first, then tune the ram

 

OP

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Well any idea why my qPI/vtt cannot be stable if raised even slightly?

 

BoT

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• Jan 25, 2012

• #18

i would raise vtt to 1.3v as well, for testing purposes only thou
once stable, move down until stability drops.
you really shouldn't need more then 1.20 to 1.25

 

Deltafan909

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• Jan 25, 2012

• #19

Try this:

-Turn the QPI Link Ratio down so that you are closer to 4.8GT/s just for now.
-Change your QPI/VTT voltage back to auto.
-Change your System Memory Multiplier to 6x. This will be slower that your RAM's rated speed, but let's keep it there for now.
-Change your DRAM Voltage to 1.65v

 

OP

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Deltafan909 said:

Try this:

-Turn the QPI Link Ratio down so that you are closer to 4.8GT/s just for now.
-Change your QPI/VTT voltage back to auto.
-Change your System Memory Multiplier to 6x. This will be slower that your RAM's rated speed, but let's keep it there for now.
-Change your DRAM Voltage to 1.65v

Click to expand...

The only QPI link ratio that's lower would be slowmode, there is no 18 for me.