4650 heat output

Hi, I own a 6530g, and I replaced the 3650 that came with it with a 4650, however it runs very hot, maxing out in furmark at 116 degrees, (in fact, until I just reseated it and applied some more thermal paste the computer shut down after reaching ~130 degrees) this is also with the laptop sitting off the side of the table a little to allow more air in, I assume a flat surface would be even more.

Would undervolting the card be possible and help reduce the temps? Right now i'm underclocking a little in order to help it.

Edit, just played a game of l4d2, more real world conditions than furmark, only 104 degrees tops, looks like thats good?

 

You need only a very fine layer of thermal paste- if you use too much of it you actually make the situation worse. In your case adding a thicker layer resulted in a significant decrease in temperature which leads me to believe that your heatsink may not be in full contact with the GPU and/or some part of the core is not covered by it.
Although there are no official numbers regarding TDP of neither HD3650 nor HD4650 it's said that the difference is only 5W. Most cooling system are good for about 35W TDP - exact (unofficial) TDP of HD4650.

Your temperature is way too high- you should test if the core is in contact with the radiator and use a copper (or not) thermal pad if needed.

That's all assuming we're talking degrees Celsius.

104 is still way to high.

 

The 3650 had an unremovable backplate (sort of like an xclamp), that rised above the card a little, so i'll take your advice and get a copper thermal pad, though its a bit of a guess of the thickness

 

You should be able to feel it if it's too thick- you can always use glasspaper on it to make it thinner.

 

Okay I got the heatpad, and after another look at it I can see what the problem is.

The heatsink installed on it has a small recess in which the 3650 die fits into, but the 4650 has been rotated 45 degrees for whatever reason, so for anyone in future, you need a copper pad about 1mm thick, cut to shape for the recess.

Furmark now tops out at 90~ after running for 10 minutes, pretty sure this could be improved further by trimming the copper to fit into the recess.

I assume you could add the 6530g to the compatibility list on the mxm thread now if you want.

 

Yeah- you could possibly improve it even more.
If you decide to do that I'd recommend buying another heatsink assembly and doing the mod on the other one- if something goes wrong you just throw it away and all you waste is a few $ an several hour of your time.
Glad to see the problem sorted out.