Sorry for the garble tapatalk screwed this post up... Here goes again
GOOD NEWS!!!! (Well for me at least
HIS RADEON RADEON 7750 (low profile) WORKS OOTB, FULLY RECOGNISED IN MAVERICKS !! (With 828 bios)
On not so good news, Mavericks isn't liking the Sapphire version of this card. I get a black screen after the boot loader (first apple I guess) loads mavericks. From then on its allll black. I'm guessing maybe if I add the device id to AMD7000controller.kext it may work, (card works fine in Linux btw, just to rule the harwdare out)... It's strange that on Tony's forums this specific card has been reported to work OOTB though.... To be continued....
Now for the bad news. CAN'T POST with both cards on board. Could this be broken in the BIOS?
Both PCI express lanes work (1&4). Each card works separately in one of those lanes by themselves. Put both in, no go. No Quo Logo, Nada. I can tell it hasn't posted yet because in this condition a single press of the power button switched the machine off, whereas if an OS has loaded it requires a long press to power off. A single press puts it to sleep. Not the case here.
've tried the following settings in 828 bios, changing one at a time, starting from loaded optimised defaults.
- init graphics Auto
- init graphics PCIe
- PCIe gen set to auto
- PCIe fixed to Gen3
- PCIe fixed to Gen2
- 3mark01 boost set to normal
- 3dmark01 boost set to legacy
- video cable attached to card in lane 1 (hdmi / dvi)
- video cable attached to cable in lane 4 (hdmi / dvi)
In every single test, on power on I get a black screen, no Quo Logo... Even after 5 min wait...
Anyone else tried two video cards (let alone crossfire) with the Oz bios? (King? If u still have any patience left.....?)
My setup: core I5 3570k 4gigs of ram, 2 ssds, HIS + SAPPHIRE Radeon 7750 1024 GDDR5