My first post around here

I have an Opteron 144 with stock cooling (I use the heatpiped cooler that came with a 4800+ dual core), running at default speed, multiplier,... and my temps are 42ºC idle / 55ºC load. I checked the heatsink/cpu twice (OK) and the temps are the same as with the original stock cooler.
Are this temps OK?
My motherboard is the MSI K8N Neo2 Platinum and they used to read wrong temps.
Case cooling: 2 intake + 1 outake
Thank you.