Heyyo,
Hmm, it seems no one has really done benchmarks with the an equivalent P4 and AMD cpu. I scavenged for an actual site with benchmarks for HSF's where they matched the same cooler with amd and intel, and couldn't find any, but luckly there was a site that has tested HSF's on AMD's and Intels at different times. Now this does give some hint that intel was cooler before the new prescott core, also note that the Intel p4 was only 2.4GHz, and the amd was an Athalon64 3000+:
http://www.madshrimps.be/?action=getarticle&number=13&artpage=1293&articID=224 (<< that's a lot of tests eh? and there's even a last page. crazy.)
and
http://www.madshrimps.be/?action=getarticle&number=4&artpage=1194&articID=245
Now, results I used:
Zalman CNPS 7700CU
AMD Athalon64 3000+: 62.4ºC, 35 @ 40cm (dBA)
Intel P4 2.4C: 48.7º, 35.8 @ 70cm (dBA)
Hmm, also note the Intel P4 tests were from farther away, so maybe at the same range as the AMD tests it would've been a bit louder, probably not that much though. ~4dBA.
If anyone has links to something like an AMD A64 3200+ and a P4 3.2GHz EE cpu going on testing HSF solutions? please link away.
I read up the THG for their latest AMD and Intel stress tests, they say the new Intel duel cores can take up to 30% more power consumption than AMD onna full load. So not only is the thing costly to buy, but even whilst owning it I'd be more expensive.