Which to belive? (TPfancontrol vs GPU-z)

Week ago i bought Thinkpad r61 14.1 inch with Core 2duo T 9300,4 Gbs ram, 160gbs HDD and Nvidia qudro NVS 140m. I bought it from Craigslist for 430 dollars. i was pretty stoked about my purchase, it is my first Thinkpad, until i started to do some research. I was terrified to discover that NVS 140m is a defective chip.

I installed Speedfan to monitor the temps, and it showed GPU temps 70 C idle. Then i installed GPU-z which showed same temp as Speedfan did. i took apart the laptop, cleaned heatsink and fan, applied new Antec Formula 5 grease on both CPU and GPU. That did not help at all. then i installed TPfancontrol and set value to 1 (2500 rpm), that helped a lot, now GPU idles at 55-60 idle. the only concern i have is running fan all the time will wear it out prematurely, but the way i see it, it'll be a lot cheaper to replace fan assembly than entire mobo.

So the question i have is which software to believe as far as temp readings go. Take a look at the screen shot.

 

You should take the average, every software has some error and the error rate is different depending on the laptop concerned. But the temperature measurement on the t9300 CPU should be quite accurate due to the use of the inbuilt digital thermo-probe.

For the Nvidia GPU temperature is not the only killer, but rather anything that is graphic intensive (which increases the current flow within the GPU), if you want to maximise your laptop lifetime, then don't play games and switch off any graphic eye candy.

The failure of the Nvidia GPU is caused by Electromigration of the eutectic bump material used within the GPU packaging.