Author: Matt Taylor
Date: 09:21:19 03/18/03
Go up one level in this thread
On March 18, 2003 at 10:17:14, Robert Hyatt wrote: >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. Just pointing out that with my heatsink & fan the chip runs very cool. I'm using a Thermalright SK6. In my experiences, the AMD heatsink/fan combos that come with OEM processors are almost as good. Running 40 C (+13) at idle is very respectable. This translates into ~47 C (+20) max. temperature. I don't think the stock P4 heatsink/fan is any better than this. I have a P4 2.6 GHz half assembled in my living room. When the power supply I ordered arrives, I'll put it together and check the temperature. -Matt
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