Quote:The problem can be memory.
The fps can nosedive if you dont have proper memory. That is why my new alienware computer will have 4gb

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Sorry, didnt mean to brag. but yeah. Memory can be a big problem.
Marick you can't brag about something you don't have yet

Experienced PC enthusiasts shudder when anyone starts quoting "Alienware" or any other branded PC system. To us, it's like just handing over a lot of cash and letting someone else do all the dirty work without having to really think about it too much.
I would recommend Alienware type products to those who are too busy earning money and have limited time or ability to learn about PC's and hence build their own. Even so, it would be desirable to find a trustworthy person or firm who would custom build one to your needs.
I deal with an online store that builds the PC for a small fee when I order the components from them. It works out about half the price of an Alienware PC for the same specification. But alas, you need to be able to create the correct specification and this takes considerable experience to be able to do properly.
More to the point of quoting you however, RAM, or rather, excessive RAM, really won't help in the slightest way to increase performance of a PC, contrary to popular (apparently) belief. Applications will use what ram they require and that is all, any excess is completely unused and is merely being "maintained" by the system.
Here in this Pic I am using task manager to quickly diagnose my resources while running a popular online multiplayer dogfight flight simulator.
It can be easily seen that my CPU is running at 100% utilisation, this compares with 1-2% when I shut the game down, so it's evident that I have a shortfall in CPU resource/speed. (CPU = 3.3ghz by the way!)
The game has paged over 430mb of data to my hard disk (for a total 544mb pagefile) as virtual memory, and has not used the available 364mb of ram I have in excess of my current requirements.
My system has only 1gb of ram, and so far, I haven't see an application use all of it. Future software releases could of course change this state of affairs.

Any inadequacies while using the software analysed here point directly to the CPU not being fast enough and not the RAM!
Testing my system using FS9 at my prefered settings shows 100% CPU usage as well, but I have more RAM to spare with over 550mb unused in "my" default flight.
I've never seen FS9 use very much RAM (compared to some other current software), though I haven't made a big issue of testing it in all situations.
It's an easy test, and task manager is easily accessed in Windows. This is one simple way to make a quick diagnosis to see if RAM is actually involved in any performance loss.
What we can determine here is the fact that CPU's still lack the power (at least mine does!) to run contemporary software and still have a little power to spare if required.