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Old September 5, 2008, 09:04 AM
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Location: Montreal, Canada
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Default Reapplying thermal paste?

So I was installing my new Vendetta 2, and using a guide, I filled the trenches between the heatpipes and then applied two lines of thermal paste on the heatsink, and then fitted it onto the CPU.

I wasn't really convinced that the thermal paste was going to cover the entire CPU, so I then proceeded to pull off the heatsink and check the paste coverage. Indeed, it did cover the entire CPU with a thin layer.

Using the Thermalright Bolt thru kit, I placed the heatsink back on the CPU without reapplying the thermal paste to the heatsink and bolted it down.

My question: Would it have been better if I had reapplied thermal paste to the heatsink before placing it back on the CPU? What are the chances that air got in?

Thanks in advance
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Old September 5, 2008, 10:58 AM
DK2 DK2 is offline
Join Date: Apr 2008
Location: GTA
Posts: 820

excellent chance. Not that you're likely blow anything, just miss out on that last degree of cooling maybe.
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Old September 5, 2008, 11:40 AM
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Location: National Capital Region, Canada
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My System Specs


Funny, I was told to ALWAYS remove your HSF once you test-installed it to make sure you were getting good contact. I onced installed a HSF that I was told "should" fit on my AMD Athlon 1000 Mhz T-bird CPU. Problem was the HSF was made for a celeron and it had spacer pads on the bottom that lined up with the spacer pads on the AMD which prevented the HSF from making contact with the die. I killed my $350 processor in about 10 seconds after turning on the computer. The shop took some responsibility for selling me a fan that wasn't compatible (there were no HSF available except for OEM that could handle that chip at the time) but they also blamed me for not checking to make sure the HSF made good contact with the die before firing up the computer. Ever since then I have always installed my HSF then removed them to make sure I was making good contact.

Just my $0.02 worth.
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Old September 5, 2008, 12:05 PM
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Good point. Its always best to be safe than sorry.
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Old September 5, 2008, 12:17 PM
DK2 DK2 is offline
Join Date: Apr 2008
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We'll call it personal preference then.
I like to put it on once to get a feel for how much paste to use given the “flatness” and contact pressure of whatever heat sink it is.
Then remove it, clean it up, and reapply for the final assembly.
To me pulling it off, and then just putting it back on will leave air, because the pressure of the first application has already “flattened” the paste.
With a nice line or ball in the middle, the paste spreads to the outside naturally, so as you tighten down the heat sink it is squeezing the air out as the paste spreads.
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