Ok so I went from a basic AMD Anthlon 3500+ computer with 2gb of DDR1, and a GT240 graphics card. Now I am running a Phenom ii 955 BE at stock everything with 4gb of DDR3 1066hrz RAM. I updated the BIOS, made sure Cool n' quiet was disabled, and that the RAM was in Dual Channel mode. Oh, and I formatted the harddrive and did a fresh install of XP 32 bit. Power Supply is 650W, and I'm using the same GT 340 with up to date drivers. However my Fps in FSX don't seem to be that much better. I'm averaging at like 30, sometimes dropping to around 10 at ground level, and spiking to 50/60 when I'm flying high. I also used system mechanic to defragment the harddrive, and registry. I'll post that stupid AMD overdrive score which has never gotten above 8000. So what do you think is causing the issues?
I agree with MrWicked.. the weak video card is a start but I would also recommend updating your OS to Windows 7 64-bit.. Do that and you'll notice a nice improvement in performance. This is also assuming that you have a decent hard drive with good read/write speeds. The hard drive is the most overlooked bottle neck in any computer.
System Specs: Motherboard: ASUS M4A78-E Memory: 8 Gig (4 x 2Gig) G-Skill 1066 DDR2 CPU: AMD Phenom II x 4 955 BE @3.8Ghz Cooling: AC Freezer 64 cooler PSU: Corsair 750W GPU: Gigabyte GV-R489UD-1GD HD 4890 OS: Windows 7 Ultimate 64