Upgrading VRAM on 2012 21” iMac

[themacpronovice2022]

Hello, with open core can I use a pc bios on the 650m on my 2012 21” iMac and upgrade it to 2gb of vram from 512mb using a pc bios and use open core to get the boot screen back?

 

[TwoH]

How would updating a bios upgrade the vram?

 

[Nguyen Duc Hieu]

Hello, with open core can I use a pc bios on the 650m on my 2012 21” iMac and upgrade it to 2gb of vram from 512mb using a pc bios and use open core to get the boot screen back?

Not with OpenCore.