The number of PCIe slots can be increased by using PCIe splitters readily available from multiple manufacturers. Some PCIex16 splitters with GPU support: I can appreciate the mad-scientist engineering here certainly, but it still scares me a bit and doesn't (directly) solve your mounting issue. You'd have to do some creative 3D printing/metalworking/etc to brace it in a desktop/tower, most likely. You might be able to get around it with differentsliauto, but there is no guarantee that will continue to work.. Now you know how to add more PCIe slots to your computer. Physically changing the number of slots on the motherboard is impossible. Fortunately, you can use the PCIe bus from one slot to run multiple devices. you effectively have to add another pci-e controller to the machine and the controller has to support sli.

PCIE Splitter Cable, GPU 8Pin to Graphics Video Card Double PCIE Splitter Cable, GPU 8Pin to Graphics Video Card Double

I think where most people get into trouble is when they start using SATA power cables to power either risers or GPU's directly, especially if they do more than 2 connections per SATA "string". So you cannot install four graphics cards on these and expect all of them to perform optimally for gaming. The performance will not even be close to optimal. Each graphics card is designed to use 16 PCIe lanes! They aren’t intended to be used on x4 slots for gaming, let alone on the 4-way split. Do you know of any x16 to dual x8 I could use? I cannot find anything useful in my initial searchesI’m thinking switching the splitter to a full size PCIE-16 will fix the problem but haven’t tried it yet. Reply So even if the PCIe version of the splitter card is V3.0, if the slot on the motherboard to which it connects is V2.0, the bandwidth will conform to that of PCIe v2.0. On the other hand, if the four connected devices have a lower bandwidth demand than 1 GB/s, they should work fine.

Actually Work? (aka PCIe Splitter Cards) Do 1-to-4 GPU Risers Actually Work? (aka PCIe Splitter Cards)

The Flexible x4 PCI Express 4-Way Splitter was designed to expand your modern motherboard (ATX, mini ATX, etc.) with a limited number of PCI Express connectors. It allows you to connect up to four x1 / x4 / x16 PCI Express boards to your motherboard’s x4/x8/x16 PCI Express connector.So, for instance, if the host slot has a bandwidth of 1 GB/s, but the bandwidth demand of the four connected devices on the splitter exceeds this amount, then you will notice performance issues.