so the question remains, should you get a "quality" y splitter and split a single 8pin into two 8pin or just hunt for a power supply that has enough connectors to meet the needs of your gpus? it can get crazy if you are building an 8-gpu rig and each gpu requires two 8pin connectors meaning you need sixteen 8pin connectors, yikes! Before deciding to add more PCIe slots to your computer, you should consider the purpose of your computer and what devices you plan to use with the additional slots. Furthermore, and this is very important to note, PCIe splitters DO NOT increase the lane count! If you split a single x4 slot into two x16 slots, you will not have 32 PCIe lanes. Instead, the bandwidth of the four lanes of the host card will be divided across the split ends. Is it the same to connect one GPU with a single riser to an 16x slot and a second GPU with a single riser to an 1x slot for mining? My mining software only recognizes 1 of the 2 cards.

PCIe Bifurcation (x16 Splitter Riser?) - Linus Tech Tips PCIe Bifurcation (x16 Splitter Riser?) - Linus Tech Tips

I’m thinking switching the splitter to a full size PCIE-16 will fix the problem but haven’t tried it yet. Reply When adding more PCIe slots to your computer, it is important to avoid common mistakes that can damage your hardware or cause other issues. 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.

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I have a motherboard with a single PCIe3x16 slot. Currently it has a GeForce 1060 card plugged into it. I would like to add an additional PCIe3x4 device, an Optane SSD with a PCIe3x4 interface to my system. Is it possible? Do you think a 4 card splitter installed in the 1x slot or 16x will make the 2 cards work? or should I go for another MOBO? Reply

wanting to use PCIe splitters/switches. A heads up to those wanting to use PCIe splitters/switches.

SKU-059-21 Flexible MiniPCI Express 2-Way Splitter (5 Gbit/sec. upstream bandwidth)(Gen2) (power from a standard ATX psu or an external 5V psu) The Splitter includes four x1 (or x4, or x16) PCI Express adapter boards with PCI Express flat ”ribbon” cables, and one x4 PCI Express host board. There are many types of PCIe splitters, and they come in many configurations. The splitter above is an external PCIe splitter.They are also great when installing multiple smaller cards like a network adapter, sound card, USB or SATA expansion cards, etc. Each of these cards utilizes only a single PCIe lane and thus would not saturate the host slot. There Are Many Types and Configuration of Splitters Since a typical motherboard and a case does not have the space to accommodate the multiple graphics cards that a mining rig uses, “risers” are used to install the graphics cards externally. The wires aren't the problem, it's the pins. SATA is rated for 1.5a per pin, so 3 x 12v = 54w (PCIe max slot power is 75w). Per pin amperage for a 4-pin Molex is 8.5a, so you can get 102w from it's +12v pin. I've seen both 11a and 13a for PCIe pins so 3x 12v = 396-468w

Flexible x4 PCI Express 4-Way Splitter | Amfeltec Corporation Flexible x4 PCI Express 4-Way Splitter | Amfeltec Corporation

The first option is expensive and may not be viable if you already have a running system. Motherboards typically come with a fixed number of PCIe slots, which cannot be changed outside of getting a new board.Told them how my EVGA PSU came with this little dandy, it's a single cable that splits into two 8 pins. However, right away they were very against it. So I googled, and have found a lot of debates about it. Some saying it improves cooling, performance, others saying no difference ect. Xeon E5-2690 v2 - 92GB ECC DDR3 - Quadro 4000 - Dell H310 HBA (Flashed with IT firmware) -500GB Crucial MX500 (Proxmox Host) Kingston 128GB SSD (FreeNAS dev/ID passthrough) - 8x4TB Toshiba N300 HDD This splitter connects to x1 slot on the board and then splits into four x1 slots for further expansion. So basically, the idea here is that the amount of bandwidth the cards occupy on the splitters should not be greater than the bandwidth provided by the primary x1 host slot connected to the motherboard.