| Intel® Pentium® D Processor 820 | Intel® Pentium® D Processor 830/840 | Intel® Pentium® Processor Extreme Edition 840* | | Specification | FMB 05A=95W | FMB 05B = 130W
Icc max = 125A | FMB 05B = 130W
Icc max = 125A
Icc_reset = 132.5A | | Key Note | Same requirements as previous processors | Has new Thermal and electrical requirements | Has new Thermal and electrical requirements | | Power Supply (PS) | No PS change = Same PS as used in 500 and 600 based PCs.
13 A Continuous,
16.5 A peak for 10ms,
2x2 connector,
2x12VDC rail | Change in PS Amps specification:
16 A continuous,
19 A peak for 10ms.
Keep same 2x2 connector,
2x12VDC rail | Change in PSU specification:
Two 12V rails required to allow system compliance to the safety requirements UL and EN-60950, each rated at:
8 A continuous
11 A peak Change in PSU connector specification:
2x4 (8 pin) connector is always needed | | Board Support (Chipset Spec) | 945/955X Chipset | 945/955X Chipset | 955X Chipset | | Chassis Requirement | No Chassis change = Same chassis as used in 500 and 600 based PCs.
TAC 1.1 (tested with 05A platform) | TAC 1.1
(05B platform) | TAC 1.1
(05B platform) | | ATX FHS | No FHS change = Same FHS as 500and 600. FCLGA4-A | New FHS solution: FCLGA4-D | New FHS solution: FCLGA4-D | | BTX TMA | No FHS change = Same FHS as 500 and 600. FCLGA4-I | (BTX boxed CPU): FCLGA4-B – 3rd party solutions (05B - FCLGA4-B) | (BTX boxed CPU): FCLGA4-B – 3rd party solutions (05B - FCLGA4-B) | | Intel® 64 Support | Yes | Yes | Yes |
RISKS of using wrong power supply: Customers who use the wrong power supply could damage the power supply. The Pentium® D processor will draw more amperage then power supply can provide. This may cause the power supply to “crowbar” or go into a switched mode. Worst case is damage to power supply and resulting boot failure. Higher quality power supplies may just crowbar, while lower cost units could become damaged. Be sure to verify the correct amperage is listed for the 12V rails Example: Look on PSU output for 12 volt rails | OUTPUT | | +3.3V | +5V | +12V1 | +12V2 | +5V SB | -12V | | Max. Load | 32.0A* | 40A* | 19A | 19A | 2.0A | 1.0A | | Min. Load | 0.5A | 0.5A | 0.4A | 0.4A | 0A | 0A | | Load Reg. | ±3% | ±3% | ±3% | ±3% | ±5% | ±5% | | Ripple V(p-p) | 50mV | 50mV | 120mV | 120mV | 50mV | 120mV | | * +5V, +3.3V, +12V1, 12V2 maximum output 530 Watts max. |
Compatibility with Chassis: Some variations of power supplies such as EPS12V are larger then a nor-mal ATX12V power supply, and will only fit in larger chassis designed for the increased size. For details on tested power supplies please check http://www.intel.com/go/powersupplies Upgrades from single core Intel® Pentium® 4 processors to Intel® Pentium® D processors:
Customers looking to upgrade the processor must be aware of the new platform requirements. You will not be able to simply drop a Intel® Pentium® D processor into an existing Intel® Pentium® 4 processor system. If the motherboard pulls more current than PSU is rated for, then the Board will not power up. | 
