I have two sticks of ram in my PC. They are each 4GB but I want 16GB. I need very short sticks because I have a pretty big fan in my PC and the ram I have rn (PNY XLR8 DDR3-1866) only fits in two certain slots because of the fan. The ram must also have a heat spreader and be either black, white or blue. And it has to be DDR3 1866 or higher.