geforce 6600 AGP 4x works fine
A couple of posts a ways back asked if the geforce 6600 card works.
I just installed mine (XFX geforce 6600 DDR 256MB, $105 @ Page Computers) and after some problems, mostly getting my dual dvi monitor setup worked out, I got G3 to run and seems to work fine.
I did have a crash the first time I ran it, rebooted, updated the nvidia driver to the latest and it works fine.
I got some good help from calling tech support at realflight. Those guys are awesome, they'll work through it with you if they possibly can. Reading threads, doing the basic detective work, seems to help.
Get the latest direct X (9.0C), run the directx diagnostic, check your monitor/monitors to make sure they're both functioning properly with directx, and you should be okay.
Also, I think, based on my experience, Athlon chips just get funky with some configs...and who knows what those hardware configs might end up being?
I have this rig: Pentium 3.06C, 2 GB DDR 3200 ram, Asus P4PE mainboard, 4X AGP slot, 400 watt power supply, two Samsung 19" monitors, both with DVI connections. oh, windows 2000, latest service packs. Very stable system for 2+ years now.
The XFX card has it's own power plug port, but a pigtail splicer comes with it so you can tap off your power supply harness. Make sure you plug in that power or you'll probably not get G3 to run...I couldn't until I plugged it in...at first I couldn't find the port, though it's right there on the card.
The tech guys at Realflight told me that Radeon cards in general have problems with G3. He said get any geforce card 5600 or above, I think that was the number, and it should work.
Personally, the tech guys are great, but I think it's unconscionable that a software company has the gall to charge this much money for a program that has such limited hardware ease of use. I'm thinking of the network multiplayer problems I read earlier and the number of cards, the vast majority in fact, that won't run. Pretty lame responses from the company too, they ought to be busting butt to make this thing as user friendly as possible.
The poster who said "we're not gamers, we're rc pilots who want to train" said it right on the button.
still, the program runs great...once you get it running.