Voltage Options:

CPU VCore up to 1.7v:

12 Asus P5E3 Deluxe X38 Mainboard Preview!

CPU PLL voltage up to 2.78v:

13 Asus P5E3 Deluxe X38 Mainboard Preview!

FSB Voltage up to 1.5v:

14 Asus P5E3 Deluxe X38 Mainboard Preview!

DDR3 Memory Voltage up to 2.78v, like CPU PLL. Perhaps it is generated from the exact same regulator.

15 Asus P5E3 Deluxe X38 Mainboard Preview!

Northbridge voltage up to 1.91v:

16 Asus P5E3 Deluxe X38 Mainboard Preview!

Southbridge voltage up to 1.2v:

17 Asus P5E3 Deluxe X38 Mainboard Preview!

Clock overcharging voltage, maybe something to do with the clock generator:

18 Asus P5E3 Deluxe X38 Mainboard Preview!

CPU Voltage Damper to adjust voltage droop according to load:

19 Asus P5E3 Deluxe X38 Mainboard Preview!

CPU GTL Reference voltage derived from FSB voltage:

20 Asus P5E3 Deluxe X38 Mainboard Preview!

CPUZ Screenshot:

21 Asus P5E3 Deluxe X38 Mainboard Preview!

At default voltage, the Intel X38 chipset only runs slightly warm without a fan on it.