3Dmark2001 is the best way to bench your system if you are after graphical performance. It's available to download from
Madonion on
this page
SiSoft Sandra will give you all the information you will never need on every minute detail of your systems performance.
SiSoft Sandra Mirror Site .
As for temperatures MBM5 is the one I use. It will also report on voltages, case temperatures etc. and information for your specific MoBo can be found on the MBM website
MBM
Hope this helps, and good luck.