I have a budget pre-built PC with a 2200G and one module of 2400MHz RAM. Now I know you should have fast dual channel memory for the graphics portion but bear with me. I'll add a RX 560 4GB. Now the buddy who has this card also wants to sell me a 2800 MHz kit with the same 8GB total capacity. I wonder if I should buy it as well or if the additional speed plus dual channel doesn't matter anymore with a dGPU... Help!