mouse 500Hz (MX518) and Win xp x64 pro

how to get higher refresh rate for USB port?
in windows xp x86 was 125Hz "3C 08 73 09 C6 86 0A 01"
and if you wanted to get 500Hz "B0 02 73 09 52 8C 0A 01"

but in win xp x64 pro is 125 Hz "3C 08 73 09 C6 87 B6 01"
and i cant go up to 500 becouse there is another hex code

so please tell me what hex is for 500Hz?

tnx

This will help you out Talks about an exe that allows you to change to 250, 500, 1000.

know this program........not working on x64 only 32 bit

no one knows?