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Overclocking I7 920 Chart from Tomshardware helpful

S

supertle55

Senior member
http://www.tomshardware.com/re...ck-core-i7,2268-3.html

I found this nice overclocking chart to be helpful. I currently have it OC to 3.4ghz. I manually set my CPU voltage down to 1.21 and was stable with PRIME95 for 5 hours. It was a bit hot for my taste at 72°C under full load. IDLE is around 44°C using REAL TEMP 3.0/Asus AI Suite. I'm hoping to go to 3.66 ghz as that's what this article is suggested the best efficiency for performance/power ratio.

Using a Noctua U12P heatsink. Thinking of reseating the heatsink and maybe re-applying the thermal paste. I might have put a bit more then I like.

I7 920, C0 revision
Asus P6T X58 motherboard
Corsair 650TX Power Supply
OCZ 6GB DDR3 Platinum

Any suggestions on how I can troubleshoot why my temperature is high. My room is a bit warm b/c of the current heatwave and I have yet to turn on the air conditioner. I was expecting around 63°C at 3.4gh and then maybe 70°C at 3.66ghz.
 
I am going to reseat my heatsink as well, specially since I messed up a little with my AS5 thermal paste. I didn't follow the online instructions for applying it in a straight horizontal line across the actual cores under the HS. Did you do this? If not, then I suggest cleaning it all off and giving it a fresh go.

By the way, with my not-so-optimal thermal paste I reach temps of 80C at the highest on Core #0, the other ones following at 2-8C less. That's at 4GHZ with the system in my sig. Idle they were around 40C each.
 
When I got my i7 920, I used my ThermalTake V1 from my Q6600. Worked at 4.0GHz, but had to run Vcore at 1.35 and temps were in the mid 80s. So was happy to run it at 3.9 with Vcore at 1.28 instead. Full load temps in the mid 70s. Picked up a Noctua recently. Since there was some AS5 still on the heatspreader, didn't bother to clean off and reapply. Yikes, temps jumped to low 90s. Cleaned it off and reapplied AS5. At 3.9, temps didn't improve too much, only dropped down to high 60s, low 70s. But now I can run stable at 4.15 with Vcore at 1.4 and temps in the high 70s.
 
hmm, I recently got a True black, and I was wondering, what is a good starting voltage(vcore, Qpi vtt) for 4+ ghz? currently at 3.6 ghz, temps are under 50 C load. Vcore is just under 1.3 via cpuz, but I think I set it a bit higher, probably 1.315 or something. cpuz says C0/C1.
 
Depends. For a C0, a little more than for a D0. In general, do you have Load Line Calibration enabled? If so, I suggest disabling it and trying to find the most "naturally" stable vcore and clock combination. 1.3V in BIOS (!!!) is a pretty good start for 3.6-3.8GHZ with a C0. Do not check and compare voltages reported by anything than the BIOS.
 
that chart is way off for my personal chip...

fyi every chip is different... usually chips in the same batch are similar, but even then there are some differences... so following a chart like that isn't the best idea
 
1.5v QPI !! Isn't Intel max 1.35?? mine does 4.6Ghz @ 1.3 QPI... After reading the article, heading should have been "Noob overclocking gone wild". lol
 
Yes, Intel recommended specs are 1.35Vc and 1.35QPI. I personally have never had to go higher. But that's with a D0.

Anyway I can't recommend going above 1.35V for *any* Core i7 chip. Too risky. Not worth the gain, if there is any.
 
Originally posted by: kerr
1.5v QPI !! Isn't Intel max 1.35?? mine does 4.6Ghz @ 1.3 QPI... After reading the article, heading should have been "Noob overclocking gone wild". lol
Click to expand...

4.6 ? damn, my best at 1.3 v. is 3.8, and that is not stable....

 
thats my 24/7 overclock.

That article has just crap information in my opinion.. phase lock loop at 2.1V!! some have had cpu failure going 1.96.. 1.8 should be good for most chips to 4.5Ghz..
 
Originally posted by: Rick James
Originally posted by: kerr
1.5v QPI !! Isn't Intel max 1.35?? mine does 4.6Ghz @ 1.3 QPI... After reading the article, heading should have been "Noob overclocking gone wild". lol
Click to expand...

D0 or C0?
Click to expand...
Both have the same max voltages

 
my c0 seems to need some voltage adjustments. at 20x190, up to 1.38 vcore, and moderately raised other voltages(Qpi vtt, Qpi pll, cpu pll, IOH...) it has low temps, even during linpack(max 54 C) but then a few minutes in freeze than BSOD. board in sig. using F5g bios. ya, still one of the betas. right now I am at 20x185, works fine, but havent stress tested yet, besides quake wars for hours on end lol. temps stay below 35.

Do I actually need MORE Vcore for 3.8? a different BIOS? (tried latest F7c beta, wouldnt post at 3.6) or am I missing some other voltage adjustment. ram running under spec, 6x multi, auto settings. rated for 1333mhz.
 
Hi I am curently running at 4Ghz the only thing i changed was the cpu voltage to 1.23 v I have an idle temp of 39-40c using speedfan and the probe i have placed on top of the cooler block shows 37c

do these seem high ? under load it gets to 84c on full load using prime 95 I moved some of the fans around in my case including the cooler fan that pushes air up through the fins rather than pulling air and this made a huge diffrence as i was getting about 46c idle and 87 - 88 on load

 
I think without stating whether HT is on or of these temp/vcore values matter little.

HT can make the system 10-20 degrees higher on my C0. And I need more Vcore for HT.
 
HT is on I have lloked at the temps runing everything auto and they are around 35c idle and about 65c prime 95 I will see what dif turning of HT makes to temps and post back

thanks

Mike
 
Originally posted by: mike2098
HT is on I have lloked at the temps runing everything auto and they are around 35c idle and about 65c prime 95 I will see what dif turning of HT makes to temps and post back

thanks

Mike
Click to expand...

your temp is fine.

Mine idles at 50C and 79C on prime. (my sys ambient is 50C)
4.0ghz @ 1.275v under bios (1.32v under cpuz)

Does anyone have any idea why cpuz is over estimating the voltage?
 
Interresting...

Idle HT off: 29 C
Full load HT 0ff: 52 C

Idle HT on: 43 C
Full Load HT on: 71 C

But Real temp gives me lower temps then ASUS probe. About 5 C while yesterday without the 120 mm fan it was about 5 degrees higher!
 
Originally posted by: PUN
Originally posted by: mike2098
HT is on I have lloked at the temps runing everything auto and they are around 35c idle and about 65c prime 95 I will see what dif turning of HT makes to temps and post back

thanks

Mike
Click to expand...

your temp is fine.

Mine idles at 50C and 79C on prime. (my sys ambient is 50C)
4.0ghz @ 1.275v under bios (1.32v under cpuz)

Does anyone have any idea why cpuz is over estimating the voltage?
Click to expand...

I get the opposite 1.475 in BIOS and 1.44 in CPU-Z with Gigabyte UD3R. Temps are in mid 80's in linpack. Never over 60C in regular programs. 4.0 ghz with turbo (20x190).
 
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