Well,
I have a AMD Athlon 64 2800+ cpu, with MSI K8MM-V mobo. its just that till 3 days before i had AMD SEMPRON 2400+ as my processor which i bought 3 monts ago. I just upgraded my mobo and processor to 64 bit. but to my despair i found out that my system is running slower than it used to run with same stuff in Sempron processor. I had made new partitions in my HDD and made a new installation of WINDOWS, but the problem persists. Everything else is ok, that means that my processor is ok i think as windows did not show any thing otherwise.

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AMD Athlon 64 2800+ (CLAWHAMMER)
O.Cd to 2.0 Ghz.
512 mb (2 Sticks of 256 mb each) DDR 400Mhz RAM Another
128 Mb GeForce MX 4000 Graphics card (Since i am not a heavy Gamer rather loves programming)
80 Gb HDD Samsung 7200 rpm SAMSUNG
GIGABYTE GA-K8VT800M
K8 TRITON Series Motherboard (Limited Edition)