Which LGA 775 CPU uses the least energy?

[Ender17]

I need a LGA 775 CPU for a file server and since this will be on all the time, I want the one that is going to use the least energy.

[haugland]

I am going to use TDP as comparison. I know that TDP does not equal power consumption, but it is a good indicator.

I would recommend that you buy a CPU with EIST, as your file server is probably going to be idle a lot of time.

Celerons have TDP down to 65W (Celeron D 360-365), but does not include EIST.

Pentium 4s have TDP down to 84W (Pentium 4 HT 620-650). EIST should be quite efficient as these CPUs have a relatively high multiplier.

Core 2 Duos have TDP down to 65W (all models except Extreme). EIST is possible, but will not downclock as much (relatively) as P4.

I would recommend either a P4, or a C2D E4300 if you insist on a LGA 775 board.


You shoul consider a Sempron 3000EE (35W) for AM2 and DDR2 or any other Sempron for socket 754 or 939 and DDR. They are relatively cheap, and you can probably find both CPU and MB for the price of a C2D E4300.

[jojo4u]

I'd also advice a AM2 Sempron. Consider wether with CnQ or not. The only chance to get as low as AMD with Intel is a mobile chipset+cpu. There are quite a few threads in this subforum. You might also search for my posts since I've been posting about this topic, too.

[jojo4u]

Perhaps I'm too ignorant, so here my LG775 suggestions. You probably already have the hardware.

1. Core 2 Duo 4300 - has a new stepping and draws less power. See thread in this subforum
2. Netburst is a bit more complicated. We go for single-core here. First about EIST/C1E. Only Pentium 4 has EIST and they are are so cheap so let's go for Pentium 4. The Cedar Mill is 65nm - fine. The newest stepping is D0 which lowers power consumption.
This resolves to Pentium 4 651 and 641. I couldn't find any tests about them, though.

EDIT: http://www.anandtech.com/cpuchipsets/sh ... i=2578&p=4 but that's with old stepping.