About CL 3-3-3-4 with HZ...

[Cybernetic]

Yesterday i try to config my g-skill PC6400 2GBHZ (DDR2) to CL 3-3-3-5 @ 728 MHz. 2.2 vdimm. Is it too high for vdimm?

And i wanna know what highest frequency of HZ can run at 3-3-3-4 ?

Thank you very much.

P.S. Mr.ZolKorn from overclockzone.com ( Thailand ) can run 3-3-3-4 @ 711MHz. and stable ! Is HZ can run higher than that ?

Thanks again.