SUP!!? I fixed this same issue... setup:
XFX HD6870
Win 8.1 Pro (x64)
x64 version of BF4
Latest Radeon drivers **BETA
2x 4GB DDR3 @ 1600
97% of Memory usage with 8GB
The point it is that Windows was saving "virtual memory"
Like this example: http://prntscr.com/214mse
So I disabled the "virtual memory" > Right click at My Computer > Properties > Advance system settings > Advance > At "Performance" go on SETTINGS > Advance (again) > Change > uncheck "Automatically manage paging file size for all drivers" > And set "No paging files" option!! Then OK to all windows opened!
Like This: http://prntscr.com/214nua
HOPE HELPED YOU GUYS!!! SEE YOU IN BATTLEFIELD!!!
^ That didn't do it for me either ☹️ (tried the broadcom registry fix as well)
