So tell me then, is this SLI patch a sure thing? Is it just tinkering around with enough stuff to get it to work or is it hit or miss?
So far, it has been rock solid. If you peruse the 'xDevs' website, you'll see the list of boards and card combinations that have worked. Really, the patch couldn't be simpler to implement, as long as you follow the instructions laid out on the website I posted before.
Have your driver installed (one that is able to be patched), download the patch, disable UAC, double click the .exe, and hit 'update' or 'install'. The program will tell you if the patch can be installed beforehand.
Afterwards, reboot, and you'll come up to an OS selection screen, where you can pick your 'original' OS or the one with the patch applied. Just boot into the proper OS, and everything should be cool.
Then, turn off your PC, plug in your second card, slap on the SLI bridge, and boot into the proper OS. If all goes as planned, you'll get a pop-up saying your system can use SLI. Simply configure your options in nVidia Control Panel, and you're rolling.
As far as I'm aware, you can update Forceware without needing to uninstall the patch, but of course, you'll want to wait until the patch's developers post that it's fine to do so. You will need to re-enable the patch if you do a BIOS update though.
I've had zero issues since the install. If you don't like it, you can uninstall the patch. They make it simple.
Are you running a 980 chipset in the 470 benchmark?
I'm running an AMD 790FX chipset, which has four PCIe x16 slots.
Here's the Overclock.net thread:
http://www.overclock.net/nvidia/881040-first-gtx-470-sli-unigine-benchmarks.html
By the looks of things, there's a mix of people using nVidia chipsets, and hacked AMD chipsets, plus a couple with Intel's for comparison's sake. One guy with an AMD cpu is using an x4 slot, though, so his results are reflecting the lack of bandwidth in that area too. Barring that, the thread gives a relatively good idea of what to expect.
It's worth investigating the hack. But I'd only suggest using it if you already have an AMD chipset with two PCIe x16 slots. If you want something entirely new, then opt for an nVidia 980a board to prevent any potential hassles.
But if you're aiming to SLI in the summer, perhaps wait and see how Bulldozer materializes. Intel's offerings will have also dropped in price.