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Minimum vcore possible is good? I7 920 4ghz

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a b à CPUs
July 7, 2010 1:37:44 AM

Hi,
I recently set my 920 to 1.225 vcore and it's stable at 69c on prime95 and memtest burnins but I am wondering, does having the minimum vcore possible while having a stable overclock slow the CPU down? Would the CPU perform better with a higher voltage despite it being 100% stable right now.

I look up other peoples results and they have higher vcore voltages... Why? The lower the cooler and the better right?

Since 1.2 ran 3.35 perfectly and 1.225 runs 4ghz perfectly, I think I have room for 4.2ghz at 1.23~ vcore. Or should I leave it at 4.0ghz and just give it a little more vcore?

Note I did prime95 for 30 minutes at 8 windows at 4.0ghz vcore 1.225 and memtest for 8 hours.

Thanks

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a b à CPUs
a b K Overclocking
July 7, 2010 10:47:52 AM

If it's 100% stable @ 1.225V then you're all good.
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a b à CPUs
July 7, 2010 2:14:42 PM

Thank you
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a b à CPUs
July 7, 2010 2:15:15 PM

Best answer selected by Blckhaze.
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July 7, 2010 7:57:47 PM

i just gotta say you have a lucky chip right there
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a b à CPUs
July 7, 2010 8:12:10 PM

Really, chips come out differently like that?
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a b à CPUs
a b K Overclocking
July 7, 2010 8:44:00 PM

Blckhaze said:
Hi,
I recently set my 920 to 1.225 vcore and it's stable at 69c on prime95 and memtest burnins but I am wondering, does having the minimum vcore possible while having a stable overclock slow the CPU down? Would the CPU perform better with a higher voltage despite it being 100% stable right now.

I look up other peoples results and they have higher vcore voltages... Why? The lower the cooler and the better right?

Since 1.2 ran 3.35 perfectly and 1.225 runs 4ghz perfectly, I think I have room for 4.2ghz at 1.23~ vcore. Or should I leave it at 4.0ghz and just give it a little more vcore?

Note I did prime95 for 30 minutes at 8 windows at 4.0ghz vcore 1.225 and memtest for 8 hours.

Thanks


Nice OC. :wahoo: 

I just wanted to add that at around 4.0/4.2 the chips require a much larger jump in voltage. 4.2 @ 1.23v would be amazing, but just don't get your hopes up.
Should try and let us know =].
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a b à CPUs
July 8, 2010 6:10:48 AM

Thanks :D 

I tried 4.2ghz, had to up the vcore to 1.267 to get stable and then the temps went to 76c and 78c so i brought it back down to 4.0ghz.
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July 8, 2010 2:06:34 PM

what about the tests? did u run prime95 for 8 hours or more? you sure its stable?
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a b à CPUs
July 8, 2010 3:46:07 PM

at 4.2, only did prime95 for about 20 minutes, didnt like the 78c temps so i shut it off

at 4.0 I did 4 instances of 2gb memtests for over 8 hours, and initially prime95 for 20 minutes, then prime95 for 30 more minutes later on. Then 2 more times last night for 20 and 30 more minutes each after changing some fans around





































































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a b à CPUs
a c 100 K Overclocking
July 8, 2010 5:01:02 PM

30 minutes prime isn't really enough to determine stability. Takes about 8 hours. As an example, when OCing my i5 750 I had it error after 3 hours, so I upped the voltage 1 notch (I think it went up 0.00625V) and then it was stable for 4.5hrs, so one more notch up and it passed 10 hours.

I'm curious what your Vtt/IMC is at?
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a b à CPUs
July 9, 2010 6:10:17 AM

vtt/imc? not sure what that is...

What I have set is
1.225 vcore
1.35 dram bus
1.66 ram
turbo on
speedstep on
bclk 190, the other one 100

Going to turn prime95 on now, and make sure its stable since you mentioned that. thanks
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a b à CPUs
a c 100 K Overclocking
July 9, 2010 2:40:08 PM

Well when OCing a CPU there's 2 voltages to fiddle with. The first is Vcore and the second is Vtt, although some BIOSes display it as IMC voltage. This is "Integrated Memory Conroller" voltage and is tied in to base clock quite heavily.
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a b à CPUs
July 9, 2010 9:40:33 PM

http://img31.imageshack.us/f/12244ghz8hours.png/

Temps are a little hotter now... When I was rebooting over and over trying to get to 4.2 the otherday, the Delta 240cfm fan melted my second fan controller, so I just took the thing out and replaced it with a 87cfm coolermaster fan. I used to run the Delta at 48% which was a decent db sound level, and it would blow a little harder than the current one but its not worth it melting all the sockets!

So this is the results at 1.231 even though CPU-Z shows 1.224. The system crashed about 4 hours in like you said it might so i had to notch it up! Thanks for that bit of info

Cooler is just a push pull H50

I looked into bios and none of the voltages I have set are IMC or VTT labeled... everything else is set to auto.

The only things I have set that aren't on auto are mem timings and what is also listed in the post above
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a b à CPUs
a c 100 K Overclocking
July 9, 2010 9:48:52 PM

Great well sounds like you've got it pretty well all set.
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!