I've decided that I want to improve my graphics quality by replacing my ATI AMD Radeon HD 7700 series GPU with a newer one. I've found the following ones to be popular. Is my motherboard compatible with them? Is there anything specific I will need to check before I get one? It has a PCIe 3.0 x16 slot but besides that I don't really know what to look for... My motherboard's model is P8H61-M LE R2.0. The first of the GPUs is Sapphire Radeon R9 280 3GB Dual-X Boost OC (11230-00-20G). The second one is Gigabyte Radeon R9 280 3GB OC (GV-R928WF3OC-3GD). The third and last one is Sapphire Radeon R9 270X 4GB Dual-X (11217-04-20G). I don't really know the difference between the first and second GPUs and I've found them both at the same price (-250 euros). The third one if 4GB instead of 3GB as far as I can tell... As far as my PSU is concerned, on the sticker, at the bottom right corner it says TOTAL: 600W.