I plugged in the two 6-pin power cables anyway and closed the side panel and fired up the Mac Pro and I waited for the login screen… and waited. No matter! It's only missing a measly 25W. Each 6-pin power cable provides 75W plus the PCI connector bus provides another 75W for a total of 225W. Plug in the 6-pin and the 8-pin power cables.Įxcept the 2009 Mac Pro doesn't have an 8-pin power cable.Unscrew the expansion card retainer plate. Disconnect the 6-pin power cable from the old GPU.I shut down the Mac Pro and proceeded with the hardware installation. With my new macOS Sierra freshly installed, I was able to successfully install the NVIDIA beta drivers without issue. A PSU tester is connected to keep the supply running without being attached to a motherboard.Install the drivers and swap in the GPU. Temporary setup with external power supply. External PSUĪdjusting a blank to provide room for the external power cable New GTX 660 External PSU 6 pin power cable running through an open slot. Mode: 1680×1050 fullscreen on one monitor
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January 2023
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