Today I will watch the fan behavior on a 4 wire GT120 whilst booting. I had a 2 wire version in last night, it was whining so loud I could hear it in next room, but I think they just fire up as soon as PCIE bus gets power. As the 4 wire version uses logic to control speed, it may not fire at boot, I will know tonight.
To all the folks reporting trouble installing El Cap on older EFI32 machines, I wish to make 2 things clear.
1. This thread has "Mac Pro" in the title. I and others who have tried with other EFI32 Macs have found a huge road block. The USB ports work from EFI at boot but at some point El Cap disables them. I currently have the only non-MP EFI32 machine running El Cap on the planet, and it required a huge kludge that nobody would live with. There is another thread in this section about "El Cap on unsupported machines" where I have this detailed. So in addition to no GOU acceleration, you can't use a mouse, keyboard, or Bluetooth. There may eventually be a solution but right now there isn't. Those other EFI32 machines may have reached the end of the OSX road. Removing the right kexts might allow EFI drivers to allow basic USB function, someone should try.
2. Yesterday I updated my two EFI32 Macs from GM to Final release. It was, as I have mentioned before, crazy easy. But I do the install on newer machines, then boot those newer machines into 10.9 to replace the boot.efi files in all 3 places, then move the drive to the EFI32 machines. I did hit one snafu yesterday that may explain some failure reports. I dragged and dropped the boot.efi to the needed places and got no "it didn't happen" messages. But one of the drives wouldn't boot, it was a SATA drive that had been internally connected. The PCIE SSD and USB drives had no issue. When I went and looked the locked boot.efi hadn't been switched, even though I wasn't told this at the time. Here is the easy way to tell. SIZE MATTERS. The EFI32 one these guys built is 314K, the "real" one is 605K (or so). If you check the size and one is 600+ K, you didn't successfully switch it. I will recheck sometime if this was entirely dependent on whether it allowed on external but not on internal. So my advice to those who think they replaced the files it machine won't boot to El Cap, check the size of the boot.efi files. If they are 600+ K in size you didn't switch them. I had to use terminal to unlock that one, then switching it out worked. That was literally the only trouble I had.
It can be done.
