as it says, I am having a hard time figuring out which graphics cards are compatible with my motherboard. It is a http://www.intel.com/content/www/us/en/motherboards/desktop-motherboards/desktop-board-dz68db.html My current specs are Processor - 2nd Gen Intel Core i7-2600K 3.4ghz LINK - http://ark.intel.com/products/52214
RAM - 24GB DDR3 @ 1333MHz
PSU - Corsair 600W Bronze PSU
GPU - Nvidia GF_gtx550ti-1gb
Expansion capabilities
One PCI Express* 2.0 x 16 discrete graphics card connector
Two PCI Express 2.0 x 1 connectors
Three Conventional PCI bus connectors
RAM - 24GB DDR3 @ 1333MHz
PSU - Corsair 600W Bronze PSU
GPU - Nvidia GF_gtx550ti-1gb
Expansion capabilities
One PCI Express* 2.0 x 16 discrete graphics card connector
Two PCI Express 2.0 x 1 connectors
Three Conventional PCI bus connectors