I'm testing this now on both my p4 2.8 and my 2500+, both are oc'd. My 2500+ crashed after 9 min, which is ok, I'm still playing with this, however it did reach test 2 of the "blend" test. My p4, is going stable still after 2 hours about now, light flickering, however it has not reached test 2 yet... Is this of any concern?

Indication of insufficient Vcore. It could also be voltage drop from either the board or PSU. Increase Vcore one notch would normally allow prime to run for hours.

Should also add if CPU temp is not a problem.

Well, it's weird, it eventially passed the first test, and moved onto another, the 2500+ to test 2 without failing or passing. MAybe they use random testing or something, or it's a different sequence for amd to p4. Still going though, and it's taking a 1.7v to keep it stable for this long (stable prime wise, I haven't had a problem with anything else since I increased the vcore to 1.6, but I'm dead set on being prime stable). I haven't noticed much temp increase either, so I'm happy, and I'm at 250FSB now, where before I couldn't get past 245. All still with a 5:4 ratio though.