Originally Posted by Shrofff
this thread makes for interesting reading but i was wondering which will benefit me more? as an upgrade to my sig rig.
1 x 6990
or 2 x 6970
they are both the same price
same power usage aswell i think
i will need a new mobo if i go for CF yet i think i need one of those anyways
i will LC the cards so that leans me towards the single card in terms of mainly flow rate as my 360 rad should be ok i hope
but what do you think ?
i have been playing beta on my 5770 *kill me now* and i am switching from my ps3 which i spent a good 500 hours on bc2 :L
You'll receive input of a staunch divide regarding this question. The 6990 has built-in advantages that make it, in my opinion, a better option than separate PCBs. That said, there are similar functional disadvantages that can be rectified, so long as the user plans their build appropriately. In your case, the potential disadvantage is anything but: heat. Since you've already integrated a water-cooling loop, the excess heat of two fully specced Cayman processors is nothing to fret. In fact, the problem is altered such to become a benefit. Instead of buying a pair of expensive 6970 waterblocks, fittings, crossfire connectors, & likely twice the flow restriction you can halve your cost with a single PCB solution.
As far as the intrinsic advantages of a single PCB chip? Judging from your avatar, high resolution framerates devoid of stutter will be a large concern, yes? Instead of traditional crossfire bridge & PCI-E bus data exchange found in dual PCB 6970 communication, the crossfire on a stick solution exchanges rendered screens & alternative GPU to GPU data exchange & sync via point to point transmission courtesy of PLX's PEX 6847 48-lane PCI-E bridge. Instead of soaking up systemic PCI-E bandwidth for gpu synchronicity, there is an efficient & fast subsystem on-board & engaged by default to significantly improve the efficiency of crossfire.
6990 cards are also vetted for clocks & voltage. The final cut is composed of cherry-picked Cayman GPUs, which explains the typical awesome overclocking results we have. That Powertune is unlocked & 5x1 portrait Eyefinity are a couple of cherrys-on-top of the cherry picked processors that, in my mind at least, make Antilles (under certain conditions) a better option.