YES! you can install everything you want..
you can remove the hdd casing to have a plenty of room for gpu
''Supports long graphics cards including AMD HD5970 (*Need to removed the HDD cage when installing a graphics card in the 4th slot and below)''
''VGA card length: 281mm / 11.1 inch (w/ HDD cage); 422mm / 16.6 inch (w/o HDD cage)
CPU cooler height: 160mm / 6.3 inch''
''microATX, ATX''