I think I found my answer from a review on the Sapphire version of this card.
Pros: -Recognizes as an R7 200 Series Card.
Cons: -NOT an Oland chipset
-IS a Cape Verde chip
-CANNOT Dual Graphics with Kaveri
Bottom Line: *** DUAL GRAPHICS - READ THIS ***
I took the risk of buying this to see if it would Dual Graphics with Kaveri. If anyone knows something about this tech and combo, the Kaveri has 512 shaders and the 250's normally have 384. This throws the sync off a little bit and doesn't allow true crossfire as it was originally intended.
That's what the beta drivers and Frame Pacing have fixed. However, this "250" has 512 and offered a chance to sync properly and should make Dual Graphics run properly and synchronously.
BUT this is actually a Cape Verde chip (actual 7750, not "rebranded" like some call the R Series) updated with Mantle and R7 features. Cape Verde chips cannot communicate with Kaveri like the Oland can. THAT is the real difference between the Radeon 7000 and R Series GPUs, the chipsets.
I tried every combo of settings between the IGP/PEG and Shared Memory in Bios, and the 13.12, 13.30RC3, 14.2 and newest 14.3 beta drivers from AMD. Not once did the option appear in Catalyst.
Always had whichever adapter I had my monitor plugged into as the Primary Adapter, and the other was the Disabled Adapter. Device Manager showed both as enabled.
FYI, I used DDU in Safe Mode to uninstall the drivers like EVERYONE should before changing or updating Display Drivers. If anyone can get this to work, LET ME KNOW. But since there is barely ANY info on the Dual Graphics compatability, I intend to provide as many details as possible.
So short answer, no it sadly will not work. AMD really needs to step it up an enable Cape Verde compatibility as it will allow a true Dual Graphics config.