On an ATI Radeon HD 4870 1 GB, It has 2 slots of PCIe Power. In the box, it already has the 2 ''Y'' cables/PCIe Adapter ( I haven't bought it, just watched someone unboxing it). I might not have a PCIe Power Connector on my 550W as I haven't bought it yet either. So when you insert the 2 ''Y'' cables/PCIe Adapter,it branches out 4 Molex slots, do you insert all 4 or 3 or 2 or just 1? If the answer is 2, do you insert one Molex connector on each adapter or both on the ''Y'' Cable/PCIe Adapter?Lastly, Can a ATI Radeon HD4870 fit into a micro-atx casing?Sorry for my bad EnglishThank You =D
The card needs 2x PCIe power cables so you need to plug in both of them. Each power cable needs 2x molex, so you need to plug all 4 in. Your power supply may also have a PCIe connector anyway so you might as well use that for one of them if you have it (it can't be used for anything else anyway) and then just use 2x molex to power the other one.
