From Aspyr.com newsletter I just received regarding system requirement:
"Civ® IV will be our third Mac game (after Quake 4 and Call of Duty® 2) to ship as Universal, both Intel and PowerPC native, in the box. We recently released system requirements for Civ IV Mac, and there was concern among Mac gamers about the fact that they were higher that expected. This is a good opportunity to take a look at how we sent system requirements at Aspyr.
As a game finishes up full testing for PC or Mac, we begin the process of deciding the final system requirements. If it is a game that started on the PC, we usually take a look at the original system requirements as a base. If it is an original game, or ported from the Xbox or other consoles, we start with some initial estimates of the minimum CPU, RAM, and video card. The testers who have been playing the game for months on a variety of systems can then give feedback about playability with those specs. Our goal in setting minimum requirements for a game isn't to set the minimum to launch the game and start the first level. We strive to set realistic requirements that will allow you to play through the complete game, all levels, on the minimum machine. Often (in the case of PC to Mac ports), this means the requirements are higher than the original platform. Civ® IV is a very good example. The CPU and RAM required to just play a simple, small world for a dozen turns is much different than playing a larger world very late in the game. While by its very nature Civ® IV slows down later in the game, with more units, cities, and technologies, we still wanted the minimum machine to provide a fun, and playable experience all the way to the end of the game. Once we have set the system requirements, we do another round of testing on the exact configuration we've specified, to verify that a game is playable all the way from start to finish.
Weve also been putting a lot of work into a new gaming application for Mac users. From a development standpoint, this is a massive project and will occupy a lot of time at Aspyr Studios over the next few months as we work to complete it before the end of this year. Look for more information on this project from Aspyr over the next few weeks."
Enjoy
Thierryr