702/660 ??
I really can't see it running stable for to long even on water !!
You are pushing the memory chips by 120 DDR more than their max (I don't mean the cards max, I mean the actual chips max)
An extra 60 on the GPU is about right but I think you will be getting artefacts pretty soon (1 or 2 weeks maybe)
with the memory that high.
A more long term (don't kill the card) speed on water would be:
600/600
maybe with mega cooling:
650/620
I know you will say that I don't know what I'm talking about, but believe me when I say, I do !!
If you want your card to work properly for more than a few weeks (sometimes a month or two) then pull the memory back to 1250 max !!
Also run it in the real world and you wont see much difference between 600/600 and 650/620 due to bottlenecks.
It's always nice to post some very fast speeds, but I deal with the real world, not what can be acheived for 1 minute, 1 hour, 1 day, 1 week or even 1 month, I always look at the life term of a card.
Saying that, if you guys have the money to replace a $500 Vid card each month then, go ahead but I will stay with the long term realistick speeds that won't destroy my memory chips in 1 - 8 weeks