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Getting a Stable OC on I7 950, currently at 3.8GHz

post #1 of 4
Thread Starter 
Hello guys,

I've been reading these forums for the last couple of weeks while working on OCing my 950. I originally was not planning to OC my cpu, but when doing some temperature readings, I found my stock cooler was not giving me any good temps whatsoever at load on stock speeds (81C!) using Real Temp. I ended up buying a Coolermaster V6GT, which reduced temps 30C under load at stock. I figured since I have a decent cooler I might as well try to overclock.

So I've been messing around with different settings in my bios for the last couple of weeks and 3.8GHz (160x24) seemed like the sweet spot for me. I used Prime95 for 12+ hours and my PC ran stable with no issues with max temps at about 71-72C. When I tried pushing to 4.0GHz is where I started encountering problems, even when coming back down to 3.8GHz.

My Bios settings are as such:

Clock Multiplier - 24
BLCK Freq - 160
SPD RAM - x10
QPI Link Speed - 5.76Ghz
Uncore - 3200mhz
RAM - 1600mhz

RAM timings:
CAS Lat - 9
tRCD - 9
tRP - 9
tRAS - 24

CPU vcore at 1.28v
QPI/Vtt at 1.2v
DRAM at 1.64v (rated at 1.65)

HT is enabled
Intel Turbo Boost is enabled.

Everything else is on auto.

Also an interesting thing about Intel Turbo Boost. When I try to disable it, my multiplier will only go to 23, but the BIOS gives me the option to manually set it at 24. When I do set it and I run CPU-Z it shows it only running at a multiplier of 23. Is that supposed to happen?

Back to my overclock. My PC never shuts down if I just keep it at idle or if I'm surfing the web and such. I've kept it on for a couple of days and no problem with my 3.8Ghz OC. However when I run Prime95, the computer just shuts off and gives me BSOD within 10 minutes. Max temps I get are 71-72C. I've searched google and this site and it's many threads for advice on how to set my voltages to get it stable. I've seen users get stable OC's at 4.0ghz with the 950, and with my cooling I definitely feel this achievable, but I think I might need a little more personalized help now.

My last BSOD gave me this message:

"Clock interrupt was not received on a secondary processor within the allocated time interval."

The rest of my system specs are located in my system details in the sig. I would be more than thankful for any tips or advice you guys might have to get me on my way to a stable OC.

Thanks!
Edited by Papazmurf - 6/9/11 at 2:36pm
Smurf House
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Smurf House
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post #2 of 4
Use this code list to help figure out whats wrong with your OC. Mines on 4.2 for a 24/7 oc, so u should be able to reach 4 easy. gl man

http://www.overclock.net/intel-cpus/...code-list.html

Also, for some reason 950 does not like even multiplyer values and your vtt and vcore seem abit low.
Edited by anthony92 - 6/9/11 at 2:43pm
Zardoz
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Zardoz
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post #3 of 4
Thread Starter 
Thanks for the the link to the BSOD codes Anthony. It definitely helped me out.

I'm still however not able to get to 4.0ghz, at least stable. It looks like I'm going to have to settle for 3.84ghz because I've finally got it stable at an acceptable temp, at least for me.

My current settings are

Clock Multiplier - 24
BLCK Freq - 160
SPD RAM - x10
QPI Link Speed - 5.76Ghz
Uncore - 3200mhz
RAM - 1600mhz

RAM timings:
CAS Lat - 9
tRCD - 9
tRP - 9
tRAS - 24

CPU vcore at 1.26v (accounting for vdroop on load)
QPI/Vtt at 1.3v
DRAM at 1.64v (rated at 1.65)

HT is enabled
Intel Turbo Boost is enabled.

They are pretty much the same specs as my first post with adjustments to vcore accounting for vdroop and QPI/VTT voltage.

My core temps idle at 42, 42, 44, 42
and at load max out at 78, 79, 77, 76

My cpu cooler is a CM V6GT.

I have two questions.

Does anyone think these temps are too high for a 3.84ghz OC on an i7-950? Ambient is about 23C right now.

My other question would be is there really much of a gain from 3.84ghz to 4ghz? If so, is it worth running the ram 100 to 200 mhz lower than spec to achieve said overclock?

Much thanks in advance.
Smurf House
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Smurf House
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Crucial BX100 500GB / OCZ Revodrive 120GB / Hit... Sony BD Burner Cooler Master V6GT Windows 10 Professional 64-bit 
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Qnix QX2710 (OC'd to 110 Hz) / Samsung Syncmast... Razer Blackwidow Thermaltake 850 Watt Cooler Master HAF 912 
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post #4 of 4
My i7 950 is at 23*174.
I think its unstability causes from 24 multiplier.
http://www.overclock.net/intel-cpus/...club-read.html
Take a look at this club and you'll only see 2-3 guys who use 24 multi. Its definitely hard to make stable at this number. Mine is 23 and I was almost crazy to make it stable. 21 was easy but as you increasing multiplier it will need more Vcore , from what I know from my cpu. I needed 1,275 VCORE at 21*191 but now it needs 1,287 VCORE at 23*174. (4GHZ).
Also when you lower the BCLK , you 'll lower the QPI/VTT. I use 1,275 QPI VTT at 174 BCLK.
CPU PLL is what I remember now 1,802.
Dram: 1,64
Firstly try the 23 multiplier with my settings. It should work.
Night Crawler
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Night Crawler
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