Windows freeze when I over clock

[Sneak]

Alright, I can over clock(I know what I'm doing). But I've never ran into this problem.

I'm over clocking my 2.8 GHZ CPU to 3.9. Of course I have watercooling and it runs at about 100º F. However, If I try to bump it up to 4, Windows freezes.

It posts, and I can enter my bios without any problems, so what the heck is going on here?

[Xato]

I'm assuming you are using Windows XP pro? and not some gimp edition like ME.

[Malatory]

you maybe running into a limit on the mobo / ram / proc.

getting a 2.8 to 3.9 is doing well seeing most reports are around 3.4

[Sneak]

Yeah, Im using Xp Pro

[TheChef]

Many people can't get past about 1 Ghz, when OCing, that's quiet a nice overclock. Pull it back down to what you were running when it wasn't freezing, and run a stabilty program such as PiFast 4.3 or SuperPi. See what you get. If it computes correctly and you dont get errors, than your system is stable. I think its just a matter of stability and you have hit the roof as to how fast your processor can go. You have increased the vCore I'm assuming and put in place a memory divider.