V7+ not performing as good as expected.

I just recently bought a Volcano 7+ a few days ago, but 12 hours before it arived i blew my XP1600+ douh! So i had to bung in my Duron, however it's not quite what i expected as The Duron 800 is running @ 1024Mhz (128FSB) @ 45~51*C (Low) fan speed, (Med) 40~49*C (high) 39~46*C. Seems high considering the case is open & have a 80mm 1900rpm (Suck) front fan & a 3400rpm (Blow) back fan Also i am using ArticSilver 3.

Any ideas?