BorgOvermind :
The game is very well optimized compared the the latest BF game.
I've played it with my now old Radeon 5870 on 1680*1050 with most things maxed out.
I think your confusing old tech with optimized...All of my games using a software engine developed in 2005-6 will run great on my old 5870 too...
My new games (BF4, Deus Ex, Lost Planet 3, Tomb Raider) using current software and hardware technology however do not run great on my old 5870...but they run very well on my new R280X. That should tell you something about the age of the graphics engine being re-used in Ghosts...