- Joined
- Oct 19, 2011
- Messages
- 51
- Motherboard
- Asus X99 Deluxe
- CPU
- i7-5930K
- Graphics
- 2x R9 280X
- Mac
- Classic Mac
- Mobile Phone
Haswell-E + X99 Motherboard Temporary Guide - OS X 10.10.0
I know it's water under the bridge but, out of curiosity, did you try this before returning them?
http://www.tonymacx86.com/401-install-bootloader-extra-efi-partition.html
I decided to keep the cards. Everything else is working well know. I may try this fix but I'm hesitant to mess around with my set up unless there's a decent chance of success.
But more importantly, the problem is your video card. The R9 (or R7's for that matter) do not support legacy boot mode. I had that same exact issue - and was told by one of the power users/moderators that the issue was just that.
So I ended up returning my XFX R9 270X and getting one of the NVIDIA cards on the Buyer's Guide. Connected that, booted with the proper boot flags, and BAM, works like a champ. I hope that it's not too late and you can return your GPUs. If not, you may have to check over in the video support forum to see if there are any users trying to get that card to work in Mavericks. That might give you some direction on how to make your cards work in Yosemite.
I know it's water under the bridge but, out of curiosity, did you try this before returning them?
http://www.tonymacx86.com/401-install-bootloader-extra-efi-partition.html
I decided to keep the cards. Everything else is working well know. I may try this fix but I'm hesitant to mess around with my set up unless there's a decent chance of success.