replaced CPU, running hot

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GeorgiaOverdrive

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I know this may be impossible to diagnose... I've never replaced a CPU before, but I replaced the i5-2400 in a HP 8200 SFF with an i7-2600, as I had been talking about. I think I did everything correctly - I blew the dust out of the heat sink, the CPU is secure, I cleaned both surfaces with alcohol, applied a spot of Artic Cooler MX-2, tightened down the heat sink, and put the plastic routing the air back in. Both fans are running at a modest speed. But with four tasks, the CPU runs about 84 degrees. With one task it runs under 80 degrees, but with two tasks the CPU temperatures get over 80 degrees.

Did I do something incorrectly? Does the i7 need a better heat sink than the i5? Or something else?
 
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GeorgiaOverdrive

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I used Artic MX-2. A video I saw said to use about as much as the size of a garden pea, which is about what I used. I saw a video that showed about that much, then he screwed it down and took it off again to show that the thermal compound spread across the thing. However, I saw another video that preferred a gel because he could brush on a thin layer across it.

I have some computers like this except that they came with i7s - I opened up one of them and it has the same arrangement. Also, the heat sink in the one I just installed is a lot hotter to the touch than the other one, even running 1 task instead of 4.

I thought about two other options (1) getting a heat sink with a fan, and (2) I have a heat sink with a fan that came out of a tower. It won't fit in the SFF case, but would it be OK to leave the case off?

But from what you said, I'm thinking that I didn't apply the thermal paste correctly.
 
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GeorgiaOverdrive

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No, it is not like that one - the fins are different and it doesn't have a fan. (The one I took out of a tower does look like that, but it won't go in a SFF.) I bought this refurbished, so they might have changed it.
 
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GeorgiaOverdrive

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OK, I was looking at this last night and I was thinking about (1) buying one , most likely the Noctuna NH-L9x65; or (2) using the extra big one that has a fan, but won't fit in the case, and leave the lid off.
 
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GeorgiaOverdrive

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I have three SFF HP 8200s that came with i5s, three SFF HP 8200s that came with i7s, and I had a HP 8200 tower that came with an i7. I bought all of them refurbished, and I think that the one in the tower is the only one whose heat sink had a fan (I have the heat sink),
 
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GhislainG

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I would order the heatsink that I linked or find one that fits the motherboard (the holes may or may not be standard).

 
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GeorgiaOverdrive

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I believe the one that you linked to on page 19 of the HP 8200 documentation is for a tower and this is a SFF. There will be a centimeter or less of clearance between the top of the fan and the case lid. Also, there is only one connector on the MB for a fan - it goes to the fan in the front that uses some plastic to connect to the heatsink.

I have a heat sink like on page 19 that I took out of an HP 8200 tower. I could put it in, connect the fan power to it instead of the other fan, and leave the lid off the case. Do you think that would work?

... added:
I took out the heat sink and I don't think I did a very good job with the thermal compound (I'll try putting some on and spreading it evenly with a card). The one you linked to on page 19 will not work - its screws are about 7.9x71. cm apart and the one in there is about 7.4x7.4. Here is a link to the one that is in there: https://www.amazon.com/HP-MULTI-UNIT-Processor-628553-001/dp/B00C9FG46I

PS - the heat sink is like on page 196-97 of the PDF.
 
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GeorgiaOverdrive

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Well, I think I found the cause of most of the problem. I took the heat sink back out to check the thermal paste, and then I reinstalled it. Then I realized that it is square, and I didn't pay any attention to the orientation when I put the heat sink back in the first time. I realized that the air should blow through the fins! I must have had it in sideways the first time. (This is why a software person should stay away from hardware.) So now with three CPU-intensive tasks it runs about 76C but with four tasks it will hit 80C (which Speccy says is too hot.)

So can someone recomend a better heatsink in this size (74x74 screw holes, no fan)?
 
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GeorgiaOverdrive

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I was testing with tasks from BOINC/ Primegrid. It handed three tasks OK but with four tasks it got over 80C, where Speccy goes into the red. But I think these use the FPU or GPU, which run hotter than integer computations. My applications are all integer, and when running eight of them it was still a comfortable 76C.
 
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