Temp of Dual core system

I have recently built the following computer :

AMD dual core 64 bit 4200+
ASUS 8AN-SLI mobo
2 gig Hynix DDR ram
256Meg 6600GT Pcie vid card
250Gig SATA-II Maxtor HD (16meg buffer)
Thermaltake 450 W power supply

this sits in a Full tower case with a fan sucking cool air in at the front.
and a second fan at the back blowing warm air out of the case.

Now when at idle the CPU temp sits around 52c and the mobo chipset around
39c

When fully loaded, with both cores reporting 100% loading (running 2 seti
programs at once) the CPU temp shoots right up to around 79c

Are these typical temps for the dual core? or is there a problem.

The CPU is using the standard AMD heat sink and fan that came with the CPU.
and was installed using the stock thermal pad that came with it.


Has anyone had any experiance with water cooling.. Have had a look at a
Thermaltake unit and may just invest in one.



Cheers and Beers

Taz