I can confirm that the 7870 xt with emudrivers 2.0 are working great!! I've corrected the typo in the .inf file, so my card is well named (with the wrong name, I had an issue with hwmonitor: the soft was crashing. Don't know if there is a cause/consequence relationship).
I just have some issue with 7870xt, atom-15 and a WG D9400. I had my system running well, but the Windows seven boot sequence was out of range on my D9400. I've flashed the hd7870xt with atom-15. I've checked the 3 frequencies (I supposed my monitor can handled those...). At the restart, the boot sequence was good displayed. I thought all was perfect, but Windows gave me just a black screen (even with another LCD monitor). I've reinstalled Windows 7. My d9400 display all the installation steps very well (even boot sequences). All seemed to work, so I installed the CRT emudrivers. I restart. My D9400 is out of range (normal step of the installation). I connect a LCD screen to see Something, but black screen. I can't go further in the setup, I see Nothing... (even with another cable and another LCD screen).
I've tried atom15 with another combination of resolutions (15khz an 24 khz) to see if the issue come from this. Same problem (black screen just after installation of the crt emudrivers). The LCD screen detect a signal with 1024x768 60 Hz resolution. But it stay black. I'll try to flash the bios with 24 and 31 khz just to see if it change something...
Maybe it's an issue with atom15 and HD7870xt... I'll let you know if I can go further ;)