HT actually slows a computer down!! Go Intel =)
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One of the main reasons that Intel introduced HyperThreading was to alleviate the effects of a cache miss but, so far, that technology has proved to be far less effective than many chip designers had hoped. The essential idea of HyperThreading is to build multiple execution units into a single processor core, if one execution unit has a cache miss, at least the other is still doing some useful work. In practice it seems that the two execution units are constantly fighting for data, often slowing the system down marginally.
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http://www.theinquirer.net/?article=13344
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Lasereth - Some people think that even now the AMD CPU model name refers to the equivalent of an Intel P4 without HT technology.
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Exactly right
http://www.theinquirer.net/?article=9475
If you cannot afford a decent cooling system, then you cannot afford a nice AMD 64 system with good components so id say stick back with the Athlon XP for now, buy some nice fans and in a couple years upgrade to the 64bit. IMO
Personally im waiting until this spring until AMD releases the 939pin mobo's and cpu's allowing (as of now) further upgradeability time down the road.