Same problem for me, loss of FR. And micro stutters, fadin trees, invisible trees, whole terrain changes from woods to open areas when closing in. Although I did manage to do some BIOS tweaking to inprove somewhat( dropped CAS Latency fom default 3.0 to 2.0, enabled fast writes, etc). These are fixes that obviously should'nt have to be considered by the everyday person who only wants to play. And besides, a vast majority won't know how to do it, or system won't allow. BTW, I'm using an ASUS 880 mobo overclocked 30%, an AMD 1500+ (yes 1500) CPU, 1024 ram, 6600gt vidcard OC'd. FR jumpes are significant, from 60-70+, down to teens(before my tweaks), now I still lose a lot(fluctuations of 40-50 at times). I'm running 512 textures, sliders about 3/4 to detail. My card seems to like the detail side of the graphic scale. I also use the Beta drivers(problem was occuring even before I installed the Betas), and the Nvidea tweaks. Hope this is an easy fix for the less puter savvy ppl. Otherwise you might have more dropping out.
Oz