A common problem with modern-day high-end systems is the lack of space. I have six slots in my system, but with two GPUs in it I only have two slots left (one PCI and one PCIe). If I want to add another GTX470 for 3SLI (with some amazing scaling due to the 5760x1080 resolution) I will lose all my remaining slots while only using half of them. I don't think I have to mention the overheating issues caused by stacking three powerful GPUs one on top of the other and then clocking them to heck. I don't like that, and I want to fix that. At work I commonly work with PCIe extender cables of nearly all shapes and sizes, so this got me thinking: Why not do something like this at home? Thus the GPUBox concept was born. I plan on building an external box which will be able to accommodate four GPUs and an additional power supply unit to feed them with power. The GPUs will be well-spaced and the box will be well-ventilated to keep them cool. Since it is not constrained as a regular computer case is I can push air from nearly any imaginable direction. Currently I am researching my options. I can start off from a regular computer case and mod it - This has the advantage of looking better than probably anything I can do myself and being water cooling ready due to having ready radiator mounts. Alternatively, I can build a completely custom case which will lend me full flexibility, but I only have experience with wood working, and no experience or tools in order to work with metal. Gonna have to think which route I'll take - But I want my third GTX470, and I want my expansion slots back!