I had shelved SH5 because my computer system is getting a little "
old"! I recently purchased Trainz 2010 (2009 release) and even setting video options way down still jerks around, I would have thought it would run this!!

however I am not flush with funds but I think the best move would be to upgrade my old ATI HD4850 512, though I still use WinXP Pro so updating to a newer card will change this to 1024mb taking a further chunk out of the 3gb XP works with, I questioned this before here way back but it is getting more urgent.

If I do upgrade it would be to a later ATI card as the Asus AMD motherboard is optimized for this.
Advise please!
Specs:
Asus M3A32-MVP Deluxe with 4 PCIe X16 slots.
Processor: AMD Phenom II dual core running at 3.7ghz
Ram: 4gb Kingston HyperX 1060mhz
Video ATI HD4850 512 HIS Turbo running at 685mhz
Windows: XP Pro