phenom 940 cooling

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Fitted in a GA-M720-US3 motherboard, the cpu is getting too hot - 78 degrees.

According to this

http://www.cpu-world.com/CPUs/K10/AMD-Phenom II X4 940 Black Edition - HDZ940XCJ4DGI (HDZ940XCGIBOX).html

its max is 62 degrees.

The cpu is an upgrade from a phenom 7750 which was running at 58 degrees.

I used this paste

http://www.ebay.co.uk/itm/251631920104?euid=f65ef550d2534d2fa755eff86d79a704&cp=1

and a 80mm fan on the heat sink.


Any suggestion on how to run the 940 cooler ?

I've already added an extra fan to the case to draw in more cool air.
 
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That paste isn't the best but if you made sure the surfaces were thoroughly clean before applying a minimal amount evenly to both I think you should have had a better result. Make sure that the cooler is sitting squarely on the CPU. Fans vary greatly with air delivery and noise so you'd need to check the spec of the 80mm heatsink fan. If there's room I'd suggest using a 120mm fan (Papst are very good) with adapter as they produce ample airflow with minimal noise. Deltas have terrific airflow but are too noisy for most people. Changing the fan direction may help too, depending on your layout. I found the best result with my system having the hot air blow away from the CPU rather than blow cold onto it.
 
Most obliged spinynorman

The fan and heat sink worked well for the Phenom 7750 the 940 has replaced.

The 940 using 30W of power more than the 7750, I suspect the heat sink may not be deep enough for adequate surface air cooling ?
 
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Looks rubbish.

Looks like a zalman fan knock-off, but made of aluminium rather than copper.

More metal = better (more thermal mass), that is a lightweight fan.
Copper = better than aluminium (and be careful of aluminium heat-sinks painted a copper colour to give an impression of quality).

Saying all that it might be better than the stock fan and good enough, but IMO if you are going to spend money on a new heatsink, spend twice as much for something four times better.
 
Most obliged Aron

I'll look for a copper heat sink. The cooler the cpu runs, the better it will perform.
 
Thanks for the link.

The one thing I don't like, if you look at the close up of the cpu contact plate, rather than a solid copper cpu contact pad, it has two copper bars and there are gaps between the bars and the main steel pad so you're relying on paste to fill the gap.

Also, its rated up to a 100w cpu, the phenom is 125w.
 
Ended up getting an AMD FX heatsink and fan unit.

It does the job but a poor design in my opinion.

Keeps the 940 below 60 degrees but with the fan only 70mm rather than 80mm, it has to run up to 5000rpm to do its job and is very loud.

I added a case fan near the heat sink to suck air out of the case which in doing so, cause cool air to pass over the heat sink fan.
 
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