wanted to see if I can connect these 2 radeon 8990 together, much rather have 4 gpu working together splitting the load evenly instead of just using 2 single gpu. or a single dual gpu. researched extensively and couldn't find anyone who has done it before. I just want to know if its possible since the card isn't on the crossfire compatibility chart. Fully aware of PSU upgrading, limit motherboard compatibility among other issues.
You can combine a 8990 with another 8990, this will give you QuadFire. (4 GPUs)