Hot i7 920 C0

Yaayuh!

Yaayuh!

Yaayuh!

Soldato
Joined
5 Nov 2010
Posts
24,837
Location
Hertfordshire
Hey guys, i've got an annoying i7 920 C0 chip here, wondered if someone could help. I moved from an Antec 900 to the NZXT H2 and the temperatures have gone up a few degrees, enough to worry about.

Rig specs:

i7 920 C0 @ 3.91Ghz (206x19) @ 1.325v Vcore, 1.325v QPI/DRAM, 1.82v PLL
Coolermaster V6GT (2x120mm 1200-2200rpm) with MX-3
Asus P6T Deluxe (v1)
9Gb OCZ Gold @ 1650Mhz 8,8,8,24,1T @ 1.66v
Asus Xonar Essence STX
Asus GTX 580 Matrix Platinum @ 900/1800/4400 @ 1.116v
Geforce 9600GT (stock)
OCZ Vertex 2e 60Gb
2x1Tb WD Black RAID-0
OCZ ZX1000
NZXT H2 (3x120mm (now 4, added one in the top 5.25" bays) 1200rpm intake, 1x120mm 1200rpm + 1x140mm 1500rpm exhaust)

Idle temperatures
38-45c

Load temperatures (Prime 95)
86-93c

Load temperatures (IBT)
90-95c

As you can see, for the overclock and voltages i'm running something isn't right here...
I have reseated the HSF twice using blob (rice grain size) and currently on line method, neither of which have improved the temperatures.
Taking the side panel off helps by a few degrees but nothing worth the noise.

I bought this chip back in October 2008, and it's never really been able to pass 4Ghz, it's not a very good 920. I'm starting to think that it's worse than i first though, maybe an IHS issue? Anybody heard of naturally hot i7 920 C0s?
 
All C0s are like that and very few can manage 4ghz. Most ended up at 3.8ghz or so. It could also be the case as airflow is quite restricted compared to the antec 900.
 
Helios1234 said:
All C0s are like that and very few can manage 4ghz. Most ended up at 3.8ghz or so. It could also be the case as airflow is quite restricted compared to the antec 900.
Click to expand...

As much as i'd like to believe that, i've spent hours and days searching for C0 overclocks, settings etc and have built 2 other rigs that have C0's sitting at 4Ghz for over a year and a half and they stay under 80c with the CM V8 HSF..
Not all C0's are bad, some are great. D0 results make the C0s look very bad, in fact there are D0s that are just as bad as C0s.

Tempted to lap my C0 and put the case on it's side to rule out contact problems.
 
My old C0 struggled to go above 3.8ghz. It's the same with the D0s where some manage 4 whereas others manage 4.2ghz which mine can't. If yours is already struggling, it might be best to leave it at that or get a better cooler.
 
Helios1234 said:
My old C0 struggled to go above 3.8ghz. It's the same with the D0s where some manage 4 whereas others manage 4.2ghz which mine can't. If yours is already struggling, it might be best to leave it at that or get a better cooler.
Click to expand...

I may have to leave it :( .As for a better cooler, what exactly? The V6GT is reviewed as being fantastic, i'd have to go into water which can get expensive. I will keep an eye on the Corsair H series, see if there's any good deals to get.
 
I have found the problem!
Basically the heatsink isn't sitting properly on the processor. This is how i know:

1. Re-seated the V6GT again, and noticed that the thermal paste hadn't spread across the processor IHS as much as i would have thought.
2. The V6GT can move easily once installed. You can grab the top and twist it easily with your weaker hand only.
3. The extra fan in the front and the better exhaust fan barely helped the temperatures
4. Taking the side of the case dropped the load temperatures by only 1c in prime 95.
5. Despite having a 9600GT and an overclocked Asus GTX580 Matrix Platinum pumping warm air into the case, it's rather cool in there still and the graphics cards are idling very low indeed.
6. The V6GT is barely warm to touch under load when running IBT with temperatures upto 90-92c..

What do you think?
Should i get on to Coolermaster about this and see if they can supply me with the V8 mounting bracket? Which is much better and should fit.
Or shall i look into getting something like the Corsair H60? Or just something better with a proper mount, preferably bolt through.
 
alex h said:
as above really good cooler
Click to expand...

Looks good apart from 2 things.
1. Massive, and i have all 6 DIMMS full of RAM
2. A couple of views show that it's only 2-3c better than the V6GT, i'll try and get the V8 mount from Coolermaster for pence before spending a load on a new heatsink i think.

I'm just glad i've found the problem, it's been bugging me for ages.
 
Well Cooler Master support is amazing. :)



Dear Mr./Ms,

Thank you for your inquiry.
We will make a exception for you and send you the LGA 1366 brackets.

Can you give us your address?

Best regards,

M***** B**
Cooler Master Service Department

PSU calculator - http://www.coolermaster.outervision.com/advance.jsp
Product registration - http://erma.coolermaster.com/member/
CM Parts Shop - www.coolermaster.nl/shop


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Any unauthorized review, use, disclosure or distribution is prohibited.
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From: Ross W***** [mailto:Ross.W*****@*******.com]
Sent: vrijdag 9 september 2011 9:42
To: [email protected]
Subject: V8 LGA1366 mount

Good morning,
I was wondering if I could get the LGA 1366 mount/retention bracket for the Cooler Master V8. I currently have a Cooler Master V6GT but it’s very loose with the standard LGA 1366 mount/retention bar, I can twist it and my temperatures are very high because the contact with the CPU IHS isn’t very strong.

This is how I know:

1. Re-seated the V6GT again and again, and noticed that the thermal paste hadn't spread across the processor IHS as much as i would have thought.
2. The V6GT can move easily once installed. You can grab the top and twist it easily with your weaker hand only.
3. The extra fan in the front of my case and the better exhaust fan barely helped the temperatures
4. Taking the side of the case dropped the load temperatures by only 1c in prime 95.
5. Despite having a 9600GT and an overclocked Asus GTX580 Matrix Platinum pumping warm air into the case, it's rather cool in there still and the graphics cards are idling very low indeed.
6. The V6GT is barely warm to touch under load when running IBT with temperatures upto 90-92c..

After reading about a couple of people having this problem they have resolved it by using the Cooler Master V8 mounts that screw into the bottom of the heatsink, they fit the V6GT perfectly fine.

If there is any way you can send just the V8 LGA1366 mounting kit that’d be great, or point me in the right direction to purchase one.

Much appreciated.

Ross
Click to expand...
 
I just received the V8 1366 Retention Bracket! I will reseat the V6GT with it tonight and let you know how i get on :) Fingers crossed!
 
ok mate so just tested my 920 C0 and with the same settings as you but voltages left on auto im getting same idles of roughly 38-39c and on prime 95 im getting 76c but im running some decent water cooling.....im currently keeping one eye on members market for a 950
 
Thanks cammy! Much appreciated.

I think i found the reason for the high temperatures. Load-Line Calibration. It adds 10c to my load temperatures... but is unstable when running Prime95 on blend, but stable running small fft...
I think because i'm running all 6 dimms full that i'm also stressing the memory controller which requires more voltage elsewhere to keep it stable.

I wouldn't mind a 950 on the cheap to keep me holding on until IvyBridge. Will keep an eye out too.

My 920 is Batch# 3837B194
Apparently it's a good'n :/ 4.2Ghz people can get on it.
 
just been mucking about for a bit and managed to get 4180mhz out of the 920, thats pretty good I think, its your dimms as you said holding you back I run 6gb corsair dominator 3 x 2gb, initially i had the chip at 4ghz with the ram at 2100mhz but dropped the setting back a notch on the ram to get 4180mhz and 1770mhz on the ram....didnt think the little guy had it in him :)
left all voltages on auto
 
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