hi everyone. i had buy 3 years ago my computer. core i5 760 LGA 1156, motherboard Gigabyte P55 UD3L, memory XMs Corsair 2X2gb. my graphic card gigabyte ati radeon 4850, 256 bit 512 ddr3. Someone offer me same ati radeon 4850 for crossfire($50). Is it worth it? I am thinking of building another i7 pc with with ati 6800 series...