Hi; a week ago, i bought a new laptop(hp zv5230us) that came in with an Athlon XP-Mobile 3000+... Weirdly, on all cpu id software i install, the processor sends back its name as a "Clawhammer Athlon 64"... I heard that this processor might be a derivative of the athlon 64 but with a smaller cache(256k), is that true? And if it is, can i run 64-bit software? Thanks!

no, it is a socket 754 low power sempron, you can verify this by using sisoft sandra and seeing that it shows 64bit is disabled.

QUOTE Hi; a week ago, i bought a new laptop(hp zv5230us) that came in with an Athlon XP-Mobile 3000+
What you have is an 'Athlon XP-M 3000+, Family 15'.
These processors are based on the same core as the mobile Sempron processors, but they were available quite awhile before any Sempron was released.
Architecturally, this core is very similar to that of an Athlon 64, BUT with a smaller L2-cache and with NO 64-bit capability.

To my knowledge, these parts can only be found in HP/Compaq Notebooks - they are called 'Athlon XP-M' since HP/Compaq wanted to offer an affordable solution that uses the same Socket 754-platform as the mobile Athlon 64 and apparently, they didn't want to wait for mobile Semprons to be officially released...
QUOTE Weirdly, on all cpu id software i install, the processor sends back its name as a "Clawhammer Athlon 64"
Well, theoretically it should have the 'Dublin'-core which has only 256KB of L2-cache to begin with, just like the new mobile Semprons(Socket 754).

However, since HP has been selling Laptops using these Socket 754 'Athlon XP-M' processors quite awhile before mobile Semprons were even officially released it is very well possible that these processors actually have a 'Clawhammer'-core with most of the L2-cache as well as their AMD64-capability disabled.
QUOTE And if it is, can i run 64-bit software?
No.
Like i said, 64-bit capability is disabled on this part - the same applies for all Socket 754 Semprons and mobile Semprons.

Generally, only processors with 'Athlon 64', 'Athlon 64 FX' or 'Opteron' in their name have 64-bit capability.

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The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates.

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Averatec also is an OEM of these Dublin core CPUs (which shows as clawhammer)