Author: Robert Hyatt
Date: 07:17:14 03/18/03
Go up one level in this thread
On March 18, 2003 at 07:09:30, Matt Taylor wrote: >On March 18, 2003 at 00:06:36, Robert Hyatt wrote: > >>On March 17, 2003 at 22:37:33, Aaron Gordon wrote: >> >>>On March 17, 2003 at 15:26:15, Sakkas Takis wrote: >>> >>>>The AMD are geting very hot when you use chessprograms >>>>Go for Intel >>> >>>How do you figure? Look at both AMD and Intel technical documents (or test one >>>yourself). AMD's run quite a bit cooler (by some 20-30 watts). >> >> >>Just for the record, "watts dissipated" is not the same thing as "running hot or >>cool." The Cray-3 for example radiates 125 kilowatts. Yes, that is kilowatts. >>It runs about -70C or so, immersed in liquid. A chip can convert more watts to >>heat, but _still_ run cooler if it has a solid path for the heat to escape >>quickly (as does the Cray with copper rods and plates everywhere). >> >>That is the limiting factor on speed, in fact. Ramp up the voltage to ramp up >>the clock and eventually you reach the point where the heat can't get out as >>quickly as it builds up, and the thing melts. > >Then for the record let it be known that my AthlonMP 1600 (~62 W) runs 3 C above >ambient temperature. The newer chips on the smaller die may be worse due to >reduced surface area. My AthlonXP 2500 has too much thermal paste on it and >still only runs around 25 C above ambient or about 54 C. > >-Matt That's as it should be, IMHO. It just means AMD has done a reasonable job on designing the chip so that the heat can be removed from the CPU core efficiently. If you go back to the 1970's and the original Cray-1, the _only_ thing that Seymour Cray patented was the _cooling system_. Pumped freon thru vertical "cold bars". Every circuit board had copper layers in them used to extract the heat from the chips to the cold bars, etc... That's how he clocked his boxes faster than anybody else at the time. There were no special-purpose chips in the original crays whatsoever. In fact, the first Cray used three chip types. The main logic chip was a simple NAND gate/NOR gate. The third was a high-speed register file. But getting the heat out was _the_ issue for that machine. As it was for all future crays including the liquid-immersion technique used later.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.