I can't find any voltage data on Intel's site, probably why I don't go there much. 
Found this though, wiki is your friend: List of Intel Pentium Dual-Core microprocessors - Wikipedia, the free encyclopedia 
.
__________________
eVGA 680i SLI (A1) P31
Intel E6750 Conroe 1333 G0 SLA9V L723B134 | Scythe Ninja-B | Antec Tri-Cool 80cfm
2x1024MB Crucial Ballistix Tracer 8500 | 5-5-5-15 1066mhz @1.9v
boot: 4x WD Caviar SE16 250gb SATA2 Raid-0
backup: Seagate 500gb 32mb SATA2
eye: eVGA 9800GTX+ SC 512mb 770/2.25ghz
candy: Samsung 940B-HAS | X-Fi XMusic | Pioneer DVR-212D SATA
juice: PC Power & Cooling 750Quad | Cooler Master HAF932
steering: Logitech G15 & G5 | E3D Pro/Momo Wheel | X-530's |