...don't forget, Den...
Assuming your Hardware is up to the task, with your add-ons fully installed, move ALL your sliders up to the MAX settings in Options: "Scenery, Aircraft, Weather, and Hardware" to fully appreciate all the benefits of FS 2004...

...!
Adding bits and bobs, over time, (mostly Freeware), like Shane says, FS 2004 will equal FSX on your existing Hardware... [smiley=2vrolijk_08.gif]...!
Paul....G-BPLF...FS 2004...Enjoy!
P.S....not being too enthusiastic about "Turquoise" coloured water, I keep my "Water Effects" slider to "None", use "Land only", and use Flight Water Pro and VOZ water effects to fill the void...

...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.