Messages in this thread | | | Date | Wed, 27 Oct 2004 17:14:35 +0100 | From | Paulo Marques <> | Subject | Re: [PATCH] Add p4-clockmod driver in x86-64 |
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Lee Revell wrote: > On Wed, 2004-10-27 at 15:59 +0100, Paulo Marques wrote: > >>I am one of the members of the robotic soccer team from the University >>of Oporto, and a couple of months ago we were looking for new >>motherboards for our robots, because we are starting to need new >>hardware (on-board lan, usb2.0, etc.). >> >>We really don't need excepcional performance, but we really, really need >>low power consumption, so lowering the clock on a standard mainboard >>seemed to be the best cost/performance scenario. >> >>Could this driver be used to keep a standard p4 processor at say 25% >>clock speed at all times? >> > > > Why don't you try the VIA EPIA mini-ITX boards? These are designed for > low power applications like yours. I am running the M-6000 which has a > fanless 600Mhz C3 processor, the newer fanless models run at 1Ghz. And, > on top of that they support speed scaling so you can slow it down even > more.
Yes, we tried those, but floating point calculations completely kill the performance on those boards.
Even at 25% speed a P4 2.8GHz gives a 700MHz clock which completely toasts a 600MHz (or even a 1GHz) C3 in floating point calculations... :(
Even more, I can get a Asus mainboard with integrated VGA, LAN, USB, Audio, for half the price of a VIA EPIA mini-ITX with comparable integer performance. As we always have to buy these things in quantities of 5, this can make some difference.
-- Paulo Marques - www.grupopie.com
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