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Originally Posted by Matth
Unconvinced by "64 bit" - YET! - and I say this with an Intel P4 640 (64 bit, hyperthreading, 2Mb cahe) on my desk.
At the moment, the best that can be said of most "64 bit" processors, is that they are 64 bit ready - since while I belive you can get 64 bit windows, ther is very little 64 bit software.
If you worry about 64 bit, maybe you should also worry about dual core.
Sure, the "full" Athlon 64's are better than the Sempron 64's - as they have more cache.
64 bitness is not a factor, unless you plan to upgrade to 64 bit windows during the lifetime of the machine - a lifetime which is already set to see another AMD socket specification.
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It is a factor when the 64-bit chips (AMD ones, anyway) outperform 32-bit ones by a large margin, even in 32-bit mode.
64-bit-ness is also a factor for me because I use Linux. 64-bit builds are available just as easily as 32-bit versions, and offer decent performance benefits.
And what socket change, out of interest? I haven't read anything that suggests that AMD are going to ditch Socket 939 any time soon...