same probleme here with remapping on and maxmem set  to 768 or 512 i still have that
tested on quad core + hd3870 512mo with catalyst 7.11 Â 7.12 and the new ones 8.1
with
Q6600
4*1 GB of gskill 6400gbpk
ASUS P5KP-AP
Sapphire RADEON HD 3870
and Arma 1.09béta
got to sisable remapping in the bios in order arma to works