by hikaru » Tue Oct 07, 2008 2:21 pm
80°C on load and 71°C idle is not critical yet but it shouldn't rise any higher. The way that it is now I would recommend to only upgrade to the TL-60 (make sure it is Taylor, not Trinidad).
If you upgrade your CPU you will need some heat conductive paste. A good paste like Arctic Silver 5 should be better than the thermal pad you have right now.
And most likely you will also need a copper sheet of 0.5mm thickness to replace the thermal pad of your graphics card since CPU and GPU don't have the same height.
I recommend you to get the paste and the copper sheet and do a "training session" with your current CPU. Remove the heat sink, replace the pads on CPU and GPU with the paste (don't forget the copper sheet) and put everything together again. Don't worry, you will still have enough paste for a second turn if you don't use too much of it (too much is contra-productive).
Do some stress tests on CPU e.g. with prime95 or two instances of your calculator computing the factorial of a big number.
You should also test the GPU with some graphics benchmark to check if you did it the right way (up to 90°C on load is ok).
If you then see a drop of CPU-temperatures for about 10°C, go for the TL-68, otherwise get the TL-60.