It's an ancient program, as 3D graphics software goes, but the adjustment sliders for varying levels of complexity for graphics, traffic, objects, scenery, weather, and animations allow it to function smoothly on even relatively basic systems. But, to get the full eye-candy experience and still run at smooth frame-rates, I built my own system which is EXTREMELY easy to do. She's getting on-in-the-tooth now, but still runs FSX liquid smooth at high graphics and detail settings:
-Tower: Cooler Master HAF X - High Air Flow Full Tower Computer Case with Windowed Side Panel and USB 3.0 Ports
http://www.newegg.com/Product/Produc...oLoA&gclsrc=ds
-Graphics Card: MSI Radeon HD 6990 DirectX 11 R6990-4PD4GD5 4GB 256-Bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity
http://www.newegg.com/Product/Produc...82E16814127574
-Motherboard: MSI 890FXA-GD70 AM3+ AMD 890FX 6 x SATA 6Gb/s USB 3.0 ATX AMD (outdated)
-Processor: AMD Phenom II X6 1090T Black Edition, 125W, AM3, 9MB Cache, 3200MHz (outdated)
-Cooling: CORSAIR Hydro Series H70 Core High Performance Liquid CPU Cooler
http://www.newegg.com/Product/Produc...82E16835181019
-Dedicated FSX Drives: 2 x Corsair Force Series 3 2.5" 120GB SATA III Internal Solid State Drive (SSD) CSSD-F120GB3A-BK in RAID0 (outdated)
-Power Supply: CORSAIR HX Series HX1050 1050W Power Supply New 4th Gen CPU Certified Haswell Ready (outdated)
-Peripherals: Saitek Pro Flight Yoke System, Saitek PRO Flight TPM System - Throttle/Prop/Mixture Axis, Saitek Pro Flight Multi Panel, Saitek Pro Flight Rudder Pedals, Saitek Pro Flight Cessna Trim Wheel
http://www.saitek.com
Best add-ons ever: Orbx Scenery (landscape, airports, objects), REX Essential plus Overdrive (Real World/Real Time weather/clouds/sky, and 'atmosphere'), FSX Banking Camera (auto tilts POV camera into direction of turn), FlightSimGPS (links Foreflight into your FSX GPS data, you use Foreflight in sim just as in your real plane).
Here is what it looks like on my sim: Orbx Grand Canyon, REX real time weather from some months ago, Banking camera looking into my turn, FlightSim GPS feeding FSX location data into my Foreflight on the iPad below the main screen...If you look closely, synthetic vision is working, my position is correctly depicted, and of course "No Attitude Information" at the top of the synth vision side, just like the real thing!
Hope that helps, I'm packing up for another lesson in the Citabria this morning, the weather looks perfect...Just another summer in February here in LA.
Larry.