im thinking on buying a zogis GT 970 4gb gddr5 256 bit pci ex. 3.0, and i want to know if my old (but battle veteran XD) intel DH55TC can handle it? and if it is compatible, also i'd like to know if i can increase the memory with 2 x dimm ADATA 8gb pc 1333 ddr3 plus 2x 2gb kingston 1333 ddr3? atotal of 20 gb cose when i looked at specifications at intel's web it says "Support for up to 16 GB of system memory" thank you