Author: Jorge Pichard
Date: 07:05:43 01/24/03
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On January 24, 2003 at 05:32:21, Matt Taylor wrote: >On January 24, 2003 at 03:05:08, Jorge Pichard wrote: > >>" For cost reasons, AMD does without a heat spreader. With a core voltage of >>1.65 Volt and a clock speed of 2250 MHz (Athlon XP 2800+), the maximal thermal >>dissipation is 75.3 Watt, while that of the Athlon XP 2700+ (2166 MHz) is 68.3 >>Watt." For that only reason I prefer the Athlon XP2700+ since the performance >>difference is NOT that Great. >> >>http://www17.tomshardware.com/cpu/20021001/xp_2800-01.html > >http://www.doerte-richter.de/mulle-78/AMD/amd_term_power.htm >http://www.intel.com/support/processors/pentium4/thermal.htm >http://www.intel.com/design/Itanium2/datashts/25094501.pdf (page 13) > >Here are some nice exerpts: >Thunderbird 1.4 GHz - 72.1 W >AthlonXP 2100 (Palomino) - 72.0 W >AthlonXP 2200 (Thoroughbred A) - 67.9 W >AthlonXP 2700 (Thoroughbred B) - 68.3 W >P4 2.0 GHz - 75.3 W >P4 3.06 GHz - 81.8 W >Itanium 800 MHz - 130 W > >75.3 Watts isn't really that bad. It just means you need a bigger power supply >and a better heatsink. What I don't like is when the temperature gets 85 degrees Celsius. But this is a defect from most AMD which run extremely HOT . Pichard >The benchmarks at the end of the article are interesting. Several show AthlonXP >being beaten by a slower-clocked P4. That raises my eyebrows since AthlonXP can >do any ALU/FPU/MMX/SSE1 op -faster- than the P4 can. That would imply usage of >SSE 2, and likely very crappy equivalent sequences for Athlon. (Consider - Gerd >has stated that Athlon dispatches up to 4 MMX ops/clock; SSE 2 ops on P4 have a >latency of 2 clocks and up and can only dispatch 1 op/cycle! Therefore emulation >sequences = up to twice as fast on Athlon.) > >-Matt
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