i just recently seen some videos on youtube about external pci-e products that support pci-e x16 but only one of them, my motherboard only supports one graphics card (Sadface) i was wondering if anyone knew one that supported 2 pci-e x16 so i could SLI my 550ti ?
Honestly, you'd be better off just buying a motherboard that supported SLI rather than trying to buy external components to TRY to make 2 cards work. You'd end up spending just about the same amount in the long run.
I agree, get a only a true multi-video card setup will give you results when it comes to gaming.
External PCIe is something that Fujitsu Corp., Japan has been working on for a long time. The goal was to be able to map additional GPUs, memory, CPUs, storage, etc., externally over a chainable bus, so you could have a laptop set up as your primary machine, then bring it home, clip it into the dock, and turn it into what ever heavy desktop device you wanted. Thus far, it has produced a couple REALLY EXPENSIVE laptop kits in Japan, but no real product direction yet.
These new "make internal PCIe external PCIe" kits are so so, and tend to be dirt slow due to signal loss over the wiring interface. Better to wait a few years before you start thinking in that direction.
Added: look at Thunderbolt as the leading developer in PCIe external interfaces. IBM has a docking system with a 16x slot, but again ran into the same thing that Fujitsu hit, with a max throughput of 1x. Apple's variant of Thunderbolt theoretically has a limit of 8x (4x bus * 2 lanes), but is limited by being a purely electrical connection (sharing a lot with USB 3.0); the original Thunderbolt concept was optical and could easily hit 32x bus speeds, but wouldn't supply power and Apple decided that this wasn't acceptable for their portability standards.
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