Hello there. I want to buy a Sapphire AMD Radeon R7 250 desktop graphic card, and it's GDDR5, so PCI-E 3.0. My motherboard is a MSI h61m-p21 (b3) with a PCI-E 2.0 slot. My question is, does it work on my motherboard? Is it compatible? i found some answers on different forums, but I wan to know for sure. In my budget it isn't space for such big errors xD. Help me please if you see it, tomorrow I want to go to the store and buy it. Thanks and have a great night!