i need to find the best compatible motherboard for for a10 -7890k processor.
There are many compatible motherboards. You can look at a list here:
http://www.cpu-upgrade.com/CPUs/AMD/A10-Series/A10-7890K_motherboards.html
Which is best depends on your requirements for size and features. The latest chipset for socket FM2+ uses the A88X FCH, and many of those motherboards have the "A88X" in the model name.
