Need help, 1333 tbird overclocking on a A7V133

Hi
I cant get my 1333 tbird to run stabil over 1540MHz.
For some reason I cant get the fsb to run over 140 MHz when I rais the multiplier to 11,5 and over though the cpu temp is at 48 degrees celsius. Only when multiplier is at 11 can I run fsb at 145 MHz. It doesnt matter if i rais the vcore it still dont post every time and if it post it sometimes hang up in windows.

Due the cpu temp I think it should go higher.

What should i do? please help me

Pardon my English

Spec:
AMD Tbird 1333@1540MHz (the later version)
A7V 133 - kt133a
gainward GF4 TI4200
...

Honestly thats not a bad oc out of that tbird. Those things run hot. Remember what chipset you are using. That chipset doesn't oc to well if I remember correctly. 145fsb is pushing it on that little guy

oki, thanks

After som more experimentations I manage to get 1574 stabil MHz out of it.
@1574 MHz cpu backtemp is 49C and chipset is @ 31C with a volcano 7+ cpufan and four extra casefans