how save is it to oc a DDR Geforce?

[atomicbomberman]

I've just recently bought a Geforce DDR-DVI... u know.. the Gillmont kind, teh 3dprophet one. anyway.. I know that regular Geforce can be oc a little bit, and so is their ram.. nothing as crazy as my old V3 2000 w/ 30mhz up, but like a little.. say 5 or 10 mhz, is it ok? I mean, I know that the Geforce core can handle it, but what about the DDR ram? Does anyone out there have a similar card and did oc it? Plz tell me.