From what ive read there is gonna be both a 5850x2 and 5870x2. The 5870x2 clock speed was originally specd to 950 core but tdp problems arose from that clock. Instesd they are gonna offer 725 or 750 clock speeds to keep the tdp down to keep pcie standard, but as soon as its overclocked whats the difference then. Its just to keep the standard pcie certification label. 5850x2 will go head to head with gt300. A dual gt300 card is gonna have the same problems as ati staaying under the tdp, if they do release a dual gt300 it will be a cut down version and Im guessing it will only be marginally faster than 5870x2.