Hello KSP-Forum! Let's see how low we can go. ATM I'm running KSP on my trusty old AMD Athlon64 3200+ (yes, that's a single core at 2GHz) with 3 GB of RAM and geForce 8800GT. And, what can i say, it runs, albeit on lowest settings. Launching larger rockets is a bit rough FPS-wise but I can do all the fun things. So far I landed Jeb on the Mün and even built a small space station. I even have some mods installed. So all in all not too shabby for a game in alpha-stage, I wouldn't have been surprised if it didn't run at all.