wow... thats a nice OC!
Is that stock? (no cooling modifications?)
Oh .. and a word of advice... your VC performance my be comprimized. Did you run benchmarks along the way?
Cuz, just because it can run that high doesnt mean its running optimal.
Start with memory 1st. make a benchmark at stock speeds using 3dmark or code creatures or whatever....
then slowly increase your clock until the marks peak... After a point the scores will drop.
Do the same with the Core.
I advise you to re-evaluate your overclock... you may burn up that nice card.