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Did not fully remove thermal compound

I installed a new heatsink (came with thermal paste pre-applied), but did not remove the thermal paste leftover from the previous one.

The temps I am getting are idle ~ 28 and full load ~ 70 (prime95).

Should I be concerned? I am worried that since the thermal paste from before has bumps and valleys (it had already dried out when I applied the new one), not all parts of the CPU are being cooled the same.
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More about fully remove thermal compound
  1. You should never leave the old stuff on. I would suggest removing it all. The temps that you are seeing appear ok.
  2. Best answer
    those temps arent too bad but if it was my own system i wouldnt leave the old paste on there. i would redo it.

    95% isopropyl alcohol (available at your pharmacy or most stores in the medicine area) works like a charm. use a q-tip (cotton swab) dippin in it to rub off any old compound (it comes off very easy) then use the dry side of the q-tip to soak up the excess alcohol (but it does evaporate quick). then just wait a minute or two for it to evaporate and you are ready to apply fresh compound.

    remember to do both the heatsink base and the chip top.
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