Question on GPU-Z

tracer1

macrumors regular
Original poster
Jan 6, 2013
123
30
SC
Occasionally when I have nothing to do, I will go to windows and quite often will check the gpu-z. With the HD7970 installed, the EFI block ( next to save your rom) is not checked. With the GTX970 installed, the EFI block is checked. Just curious as to the difference.
 

tracer1

macrumors regular
Original poster
Jan 6, 2013
123
30
SC
so would it be running in legacy & the 970 running in uefi?
 

h9826790

macrumors G5
Apr 3, 2014
12,783
5,592
Hong Kong
Or perhaps GPU-Z doesn't understand Apple's proprietary EFI.
From memory, GPU-Z can tell that my 7950 Mac Edition card has EFI. I suspect it only check a particular byte in the ROM, if 00 means EFI, and 80 means legacy. But not really read through the entire ROM to determine if the ROM has a proper / standard EFI part.

so would it be running in legacy & the 970 running in uefi?
It just tell you if the ROM contain the EFI, but not which mode is running at the moment. If you install Windows via bootcamp, it should be in Legacy.
 

tracer1

macrumors regular
Original poster
Jan 6, 2013
123
30
SC
yes Windows is via bootcamp. Kinda thought the AMD would be legacy but not sure on the Nvidia 970