Everyone wants to clock those cards to 700MHz and some of the partners might actually be able to do it, ship it and to support the warranty at such a high clock speed. The magical overclocking number is 710MHz and the guys who tested it could not go more than that. The cards are throttling at 720MHz and that’s as high as you will reach with air.
If they are that good on air, then water cooling will only help them along even more. Maybe this will be a worthy upgrade from a 7800. Read more at The Inq.