How did you do to install the 7gpu?
You install the 7 gpu and install driver after?
Or did you install driver with 1 gpu and then boot with the 7?
At home windows 10 recognizes the 7 gpu well, but when I run claymore I lose the driver. And i have bsod, and when i want to reboot it does not boot.
Here are my steps:
1. Install the hardware of the PCIe splitter (only need power from molex or sata, not both) and GPU's and connect everything.
2. Boot into BIOS and change PCIE link speed to gen1.
3. Boot computer in safe mode.
4. Run DDU to install all old drivers from here http://www.guru3d.com/files-details/display-driver-uninstaller-download.html
5. Reboot computer normally.
6. It should show 7 gpu in device manager, if so, install drivers 16.9.1 (I have tested and it seems the most stable for me) http://support.amd.com/en-us/download/desktop/previous/detail?os=Windows%207%20-%2064&rev=16.9.1
7. Once driver's are installed, do not reboot computer. Download this and run it and modify registry https://lbr.id.lv/6xgpu_mod/
8. Now reboot, and everything should work.