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Q6600 Push/Pull w/ T.Ultra 120 - Stable OC?

post #1 of 11
Thread Starter 
Hi there!

My parts are in and I opt'd for a Q6600 and thermalright ultra 120 for cooling using two Silverstone FM121 120mm fans for a push/pull.

Given that setup and assuming a high end room temp of 26 degrees (most likely will never be above 22, but I want the worst case scenario numbers), what are my realistic overclocking capabilities? I'm hoping someone has the same or close-to setup and could offer their experience.

I'm aiming for a modest 2.7Ghz - 2.8Ghz STABLE under max load overclock. I know others have hit 3Ghz on air, but there will be times I will be utilizing all 4 cores @ 100% for extended periods of time.

This is my first time over-clocking a quad-core and I'm a bit cautious given what I've heard in regards to the heat generated by these things under max loads.

I'm looking for a modest OC that will keep temps in a 'comfortable' range; I don't need nor want to hit the maximum limit the chip can take. This box will eventually turn to the role of a server (be it for home/personal use) and on 24/7 so I need to keep the heat under control.

Thanks in advance and I'm looking forward to seeing how well other people with this setup have faired.
    
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post #2 of 11
try to keep voltages as low as possible. stock is 1.350 if i remember correctly, but with my E6420 i could hit 2.7-2.8GHz at just 1.25v.
post #3 of 11
Welcome to OCN. go HERE to enter your system stats.

you will easily hit at least 3.2Ghz on that setup, and temps will be very confortable. (EDIT: dont go nuts with the voltage as Chielscape suggested. you should get to 3.2ghz at 1.35v)

IF the airflow is good on your case and you get a good "week" on the cpu, maybe even around 3.5ghz - 3.8ghz(being REALLY optimistic with 3.8, and temps may NOT be confortable at that point )
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post #4 of 11
Most if not all 680i board have FSB limitations with quad-cores. I don't know about that one specifically, however. If it does, then temperature will not be a factor in your OC.
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post #5 of 11
Quote:
Originally Posted by THaNaToS_J2 View Post
Hi there!

My parts are in and I opt'd for a Q6600 and thermalright ultra 120 for cooling using two Silverstone FM121 120mm fans for a push/pull.
Hey mang ...

Do me a favor once you get your PUSH > PULL > setup all ironed out.

Post your temps...

And then, try the exact overclock except running your FM121's in PUSH > < PUSH.

I did that same comparison using two FM121's with my Scythe Infinity and the PUSH > < PUSH was 3 degrees better than PUSH > PULL >.

Been running it PUSH > < PUSH for six months now.

I'm curious to see if the same results will apply to the slightly narrower Ultra 120 ...

The infinity is almost square and so their is lots of room on the non fan sides for the air to be jettisoned out ...

Look forward to seeing some numbers ...

    
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post #6 of 11
Quote:
Originally Posted by s1rrah View Post
Hey mang ...

Do me a favor once you get your PUSH > PULL > setup all ironed out.

Post your temps...

And then, try the exact overclock except running your FM121's in PUSH > < PUSH.

I did that same comparison using two FM121's with my Scythe Infinity and the PUSH > < PUSH was 3 degrees better than PUSH > PULL >.

Been running it PUSH > < PUSH for six months now.

I'm curious to see if the same results will apply to the slightly narrower Ultra 120 ...

The infinity is almost square and so their is lots of room on the non fan sides for the air to be jettisoned out ...

Look forward to seeing some numbers ...

with the smaller thickness of TR, push push < push pull but i cannot say for sure
    
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post #7 of 11
Thread Starter 
Well, the push/pull I had in mind was a little different.

Hope this makes sense... The case has a lower 120mm fan for intake, 2 rear 120's, 1 top 120 for exaust and 4 120mm fans on the side door.

I have a fan mod that fits into 3 of the 5.25" bays. I'm going to run 120mm thermal duct from that fan to the push fan and then 120mm duct from the 120mm pull to the rear exhaust. Essentially 4 120mm's in a dual push/pull for maximum airflow from the front of the case to the rear. Why am I not using just 2 you might ask? Well I want an OC that can tolerate 1-2 fan failures if I'm not home and number crunching like crazy on the chip. I'd rather come home to somewhat high temps then to find my pc rebooted or shutdown due to the high temps.

Hope that setup makes sense...
CASE-REAR (Pull)(<--Duct<--)(Pull)[HS](Push)(<--Duct<--)(Push) CASE-FRONT.
    
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post #8 of 11
Quote:
Originally Posted by THaNaToS_J2 View Post
Essentially 4 120mm's in a dual push/pull for maximum airflow from the front of the case to the rear. Why am I not using just 2 you might ask? Well I want an OC that can tolerate 1-2 fan failures if I'm not home and number crunching like crazy on the chip. I'd rather come home to somewhat high temps then to find my pc rebooted or shutdown due to the high temps.
Makes total sense. I was going to do the same thing but ran into alignment issues with the rear exhaust fan ... I even bought all the Thermalright ducting to hack into the mod ...

Can't wait to see how that works man!

You must post numbers and pics once you get it setup.

    
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post #9 of 11
Thread Starter 
Sorry for the delay in getting back here, but life loves to keep one busy!

Ok, so everything is hooked up minus the thermal duct as I haven't had time to pick any up, but the setup is looking good!

So I decided to run 2 Silverstone fans pushing ~110CFM. These guys:
http://www.newegg.com/Product/Produc...82E16811999344

They're in a push/pull config with a 120mm fan on the side door pushing air in to the push fan and 2 120mm fans on the rear getting rid of the heat the pull fan is kicking their way.

I kicked off 4 instances of prime (affinity set respectively) and have had them running for about an hour. I found one thing very odd. Cores 1 and 3 are running at 55 degrees and 2 and 4 are running at 45. I know the heatsink is installed correctly and the AS5 is put on perfect as always. (I'm very anal with applying thermal paste. Patience is key for perfection!)

Room temperature is holding at 21 degrees. The CPU idles at 27-30 degrees in the same environment.

Wondering why those two cores and generating 10 degrees more heat then the other two. Anyone have similiar experiences?

(p.s. gaming with this chip in Oblivion and the 8800GTX @ 575/1800 makes you feel like a kid on christmas!)
    
CPUMotherboardGraphicsRAM
Q6600 - B3 @ 3.0Ghz (333x9) EVGA 122-CK-NF68-A1 LGA 775 NVIDIA nForce 680i EVGA GeForce 8800GTX SLI'd OCZ Reaper EPP - 8GB (4 x 2GB) 
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OS 74GB Raptors R1 / Data 500GB Seagates R1 Vista Ultimate x64 Dell 30" Ultrasharp HC (2560x1600) G15 
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post #10 of 11
I get something similar. I have a Quad 6600 overclocked to 3.1ghz and my cores 1+4 Idle around 51 and my 2+3 at about 42. I reapplied the paste and reseated it and it switched to 2+3 being higher and 1+4 being lower lol. Just can't get it right!

P.S. Overclock that graphics card baby!!! Trust me easy performance boost using ATItool
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