Glad to see it's working in Sierra. You don't need to touch AMD9510Controller for the R9 Fury. 0X73001002 is already in AMD9000Controller. All you need to do for Fiji card is adding 0X73001002 to AMDRadeonX4100.
Once you do the CU unlock, the OpenCL performance will be much better. It's running at 16 now rather than 64. The pair of X5690s really let your R9 Fury fly.
Yes, I can confirm that, just grep'ed the 9000Controller Info.plist and see that 0x73001002 is indeed there. I'll change it back tomorrow and see what changes it brings. I've already done the CU unlock, it increased the Luxmark score from 12000 to 15000, still lower than I had expected, but much better than the GT 120. It may be that using the correct Controller kext will help result in higher scores overall.
Am I correct in assuming that AppStore system updates are all ok, aside from actual OS point upgrades? I've backed up both kexts in any case.
Surf