I was taking a look at the Celeron-D chips for an application of mine and relized what voltage it ran at, or at least what newegg.com says. Quoted below:
Hugh?

Intel Celeron D "320" 2.40 GHz, 533MHz FSB, 256K L2 Cache Processor - Retail
(limit 5 per customer)
- Specifications -
Model: Intel Celeron D
Core: Prescott
Operating Frequency: 2.40GHz
FSB: 533MHz
Cache: L1/12K+16K; L2/256K
Voltage: 0.956V-1.052V
Process: 90 nm
Socket: Socket 478
Multimedia Instruction: MMX, SSE, SSE2, SSE3
Warranty: 3-year MFG
Hugh?