thingi Posted July 28, 2015 Share Posted July 28, 2015 Hi, I've just bought the following to upgrade my old Core2Duo / IntelGMA950 mac mini. A P28S-P28F (PCI-Express to MiniCard Extender) and a PCI-E PCI Express 1x To 16x Adapter Riser Extension Card With USB 3.0 Cable (which are usually used for bit coining with kick ass GPU's that need extra juice). The pcie riser is powered by a molex, I've got a spare atx psu but would rather use a 12v regulated power brick. I'm not sure if the molex 5v is used as a step-down to 3.3v for PCIe or if it's electrically 12v > 3.3v on the riser. I've read that GTX750's require 20A on an ATX psu 12v rail, but the max amps on the PCIe slot is 75w 12v @ 5.5A = 66W, The rest of the PCIe slot's ~10v is from the 3.3v. Do GTX750's use the 3.3v from PCIe, How many Amps do they really draw from a 12v rail (non-oc'ed and non-ti)? Will I need to either step down the 12v power brick to 5v too?Obviously an 80w+ regulated 12v 6amp power brick will supplement the mini's PSU but do I need to do something about the 5v / 3.3v supply (no sure if the mini can cope with the 3.3v power draw from it's m-PCIe slot). Thingi Quote Link to comment Share on other sites More sharing options...
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