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Should I use different thermal grease for CPU / GPU? - Page 2

post #11 of 16
Oh you mean in the tube? After quite some time, the paste separate - there's a solid/hard dry part and a liquid/viscous part. It means the paste is too old.
After like 5 years I thought my Core 2 duo fused with the heatsink. The paste was so dry no screw were needed to hold the heatsink.
I guess YMMV.
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post #12 of 16
Quote:
Originally Posted by GridIroN View Post

No you don't need different stuff.

Arctic Silver 5 is the best of those options.

I personally prefer Gelid's thermal solution as it's a superior mix between wet pastes and dry pastes.

uh, no it isnt. i would, and did, use the k2.

Quote:
Originally Posted by Just a nickname View Post

Wut, proly super dry.

It's good to assume curing time won't be longer than a week.

it takes 200 hours of heating and cooling cycles. it will take a lot longer than a week.

Important Reminder:
Due to the unique shape and sizes of the particles in Arctic Silver 5's conductive matrix, it will take a up to 200 hours and several thermal cycles to achieve maximum particle to particle thermal conduction and for the heatsink to CPU interface to reach maximum conductivity. (This period will be longer in a system without a fan on the heatsink or with a low speed fan on the heatsink.) On systems measuring actual internal core temperatures via the CPU's internal diode, the measured temperature will often drop 2C to 5C over this "break-in" period. This break-in will occur during the normal use of the computer as long as the computer is turned off from time to time and the interface is allowed to cool to room temperature. Once the break-in is complete, the computer can be left on if desired.
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post #13 of 16
In addition to curing issues......
Quote:
Arctic Silver 5 was formulated to conduct heat, not electricity. While much safer than electrically conductive silver and copper greases, Arctic Silver 5 should be kept away from electrical traces, pins, and leads. While it is not electrically conductive, the compound is very slightly capacitive and could potentially cause problems if it bridges two close-proximity electrical paths.)

That's very likely on a GPU block when applying TIM to the thermal pads as recommended by the WB manufacturer. EK includes Gelid Extreme and I pretty much use that or Shin Etsu.

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post #14 of 16
Quote:
Originally Posted by pc-illiterate View Post

uh, no it isnt. i would, and did, use the k2.
it takes 200 hours of heating and cooling cycles. it will take a lot longer than a week.

Important Reminder:
Due to the unique shape and sizes of the particles in Arctic Silver 5's conductive matrix, it will take a up to 200 hours and several thermal cycles to achieve maximum particle to particle thermal conduction and for the heatsink to CPU interface to reach maximum conductivity. (This period will be longer in a system without a fan on the heatsink or with a low speed fan on the heatsink.) On systems measuring actual internal core temperatures via the CPU's internal diode, the measured temperature will often drop 2C to 5C over this "break-in" period. This break-in will occur during the normal use of the computer as long as the computer is turned off from time to time and the interface is allowed to cool to room temperature. Once the break-in is complete, the computer can be left on if desired.

Up to 200 hours. It cures at room temperature but will cure faster if you use your computer and if you run it at higher temperature. It follows an exponential curve, the 2/3 of the time it takes to cure will make minimal difference. A week is plenty enough IMO.
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post #15 of 16
it will not cure at room temperature. it takes heating and cooling to cure. put a few drops on a piece of metal you have lying around and let it sit. tell me when its cured. oh thats right, it will just dry out. i also dont understand your "2/3 of the time it takes to cure"
its almost irrelevant anyway as it makes a difference of 2* to 3*C after curing in almost everyones systems. also is the fact there are better tims now then there was when as5 was released.

as far as how good the k2 is almost as good as ac mx-4
http://www.vortez.net/articles_pages/xspc_raystorm_750_rs360_watercooling_kit_review,11.html
mx4 is better than as cerm 1 and 2 and definitely as5
http://skinneelabs.com/2011-thermal-paste-review-comparison/2/
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post #16 of 16
Quote:
Originally Posted by Just a nickname View Post

Up to 200 hours. It cures at room temperature but will cure faster if you use your computer and if you run it at higher temperature. It follows an exponential curve, the 2/3 of the time it takes to cure will make minimal difference. A week is plenty enough IMO.

I routinely test my own as well as users systems every 3 months.... I have found temps still improving after 6 months of normal usage with AS5. And regardless of run time, it will take much longer to cure if you do not run it through complete thermal cycling....... Leaving the system on for 8 days straight does squat, it's the repeated heating and cooling cycling that effects the cure.

I have found a way to reduce this though.... once I find a stable OC that I am comfy with and save the settings in a profile....usually at about 75C, I will clock a bit higher and try and bring the temps into the low to mid 80s......I find "cooking the TIM" to about 10C above where I expect the normal max to be will significantly decrease the cure time. Of course, voltage and temps are carefully monitored for the 5 minutes or so I keep it at these temps.
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