Im running GUIMiner and i just added another card and it brought my hash rate to about 255-260 from about 220.  I feel like the second card should be working better than that.  They currently aren't crossfired i am running them with a second monitor.  Hot do i see the 400ish that i should get from these 2 cards?  I am also overclocking them to 875 and downclocking the memory to 900.  I havent flashed the BIOS of either card. (cuz i dont know how and dont trust myself to do it right)  How do i optimize the performance of this rig?