SPCR

Hi everybody! I'm new to this great forum, so I hope that you will be patient with me.
I've just built a (budget) system consisting of:

Mobo: MSI K8N NEO-FSR s754
CPU: Sempron 2600+ s754 with stock cooler
Memory: 512mb Kingston 400mhz CL3
Harddrive: Samsung Spinpoint 80gb
VGA-card: Sapphire 9600pro 128mb
Crappy case and PSU (But the PSU is quite silent actually)

I decided to try CPU-burn, and after 1h 20min, my temps are (according to Speedfan):
Temp1: 46
Temp2: 52
Temp3: 42
HD0: 42
This is with the stock cooler@3000RPM
What does the different temps mean? I understand that HD0 is my HDD, but what about the others? Anybody have an idea?
Are these good temps, or way to high? It might be helpful to know that I do not have any form of case fans installed.
Thanks in advance.

Hamman wrote:I decided to try CPU-burn, and after 1h 20min, my temps are (according to Speedfan):

Have a look at "charts" in Speedfan the one with the biggest variance is you CPU. You should not care about temps as long as you PC is stable

Thanks for the tips on the charts!
Regarding temps: If I can't be worried about the temps of my computer, what then should I be worried about?
Seriously, It's nice to know if your PC runs cool or hot, especially when you're planning to buy better/quieter cooling.