tiny voices :
Honestly you kind of screwed yourself. BF4 specifically states that 2gb VRAM is needed for high+ settings and even with the GPU power of 2 7850's, you will bottleneck on the textures and not likely be able to run it on ultra. Sorry man. High settings will probably be fine, but many new and upcoming games will need the extra vRAM. This did not used to be the case, but MANY games now benefit form the Vram.
There is no way to make more than 1gb vRAM using your 7850. Adding another card is a waste of money. You should just sell it and buy a 2gb version. Cut your losses.
Ya i was just reading up on the crossfire setup, sad day. Not worth another $200 to double up now so I will ride out till Christmas and let the GF know I need a new GPU, lol she just bought me this one for my BDay... Wonder when she is gonna get purple in the face from this, she invests in a new one at least once a year! Thanks for all your help! And yes i run in 16x/16x
Current System:
CPU: Phenom II x6 1065T w/Cooler Master Hyper TX3 with 2 fans
RAM:16GB 1333 G.Skill RipJaws
GPU:XFX Radeon R7850 Ultra OC Edition 1GB w/ARCTIC Accelero TT II VGA Cooler
MOBO:MSI NF750-G55
PSU:Cool Power Gamer Pro CP-GP775 775W (yes I know I need an upgrade xD)
CASE:Antec 300 3x120mm intake fans 2 on front one on door over gpu, 1x120mm exhaust back, 1x140mm exhaust top