[edit] Posted on my blog about the upgrade. Info, benchmarks and some pictures:
http://sjackm.wordpress.com/2010/11/27/pc-upgrade/
I just upgraded my platform today.
I changed the CPU from an Intel Pentium D935(2007) 3,2 ghz to an Intel Pentium E6500(2009) 2,9 ghz. My motherboard is a Gigabyte GA-P965-S3 rev 3.3. I had to upgrade the BIOS to the latest version.
Results?
-from 120w in idle my PC now consumes 83w
-from 42 seconds for 1M in SuperPI to 19,5 seconds
-temperatures are quite the same, but the cooler was greatly reduced in size (and doesn't have a copper base, like the old one used to have): about 35 in idle I think
I also changed the original cooler from my Gigabyte Ati Radeon HD4850 with an Arctic Cooling Accelero.
-from 79C in idle and 89 full load it's now 38C in idle and 61-62 in full load.
Bad ass. an[d?] you're Ant.