BoomR
Moderator
- Joined
- Dec 18, 2011
- Messages
- 1,256
- Motherboard
- Gigabyte Z490 VISION D
- CPU
- i9-10850K
- Graphics
- RX 580
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Haswell-E + X99 Motherboard Temporary Guide - OS X 10.10.0
First, make sure that you have the latest UEFI Bios from ASUS on your X99-Deluxe. You should be on v1004. That version is required so that you can boot from a GUID Partition Table-partitioned drive. Otherwise, you'll always have to boot with your USB UniBeast key.
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.
First, everyone, thanks for all of your work on this. I'm amazed to have gotten this far (Geekbench: 3490/19684).
The only way that I can boot is to enter BIOS, click on the USB drive (I think this is a boot override setting) and allow the installer stick to boot. I can then mount my Yosemite drive normally. My hardware is:
Asus X99 Deluxe
i7 5930K
Dual R9 280X GPU
32GB RAM (G.Skill PC4-1900)
512GB SSD
First, make sure that you have the latest UEFI Bios from ASUS on your X99-Deluxe. You should be on v1004. That version is required so that you can boot from a GUID Partition Table-partitioned drive. Otherwise, you'll always have to boot with your USB UniBeast key.
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.