After battling every single problem I've had with crashes and whatnot, this is the only thing that is bugging the crap outta me. I've tried for several days now to fix this but it just wont budge, this goddamn problem.
Same as you, I can play for 20-40 minutes, it varies. Then my FPS drops from ~65-70 to 0.5-1 and I have to quit using the taskmanager. When I get out of the game I see my memory usage peaking 98 percent and not decreasing, only way to decrease it is to restart my computer.
This occurs on both Windows 8.0 and 8.1, using the latest AMD Beta driver (13.11 BETA9.2 or something), or older drivers. (Tried both)
Specs:
Win 8.1 Pro 64Bit (32bit BF4 is not working either, haven't checked if it prolongs the time before the memoryleak spikes)
AMD Phenom II X4 960T
AMD Radeon HD6870 - No overclock done
8GB Ram
My task manager declares that 7.8gb of RAM is being used at the time when I quit BF4 after lagging like crazy, however I have no process being over 200mb of RAM usage, which I find weird.
Heres a screenshot showing my taskmanager after quiting BF4 just 10 minutes ago - Note my RAM usage (Minne)
http://i42.tinypic.com/os7r02.jpg
