Author: Matt Taylor
Date: 02:32:21 01/24/03
Go up one level in this thread
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. 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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