But what I can say is two things:ġ) The GOG version is rather different from steam or dvd and comes preconfigured with various fixes and tweaks.
I have read there can be issues using intel integrated graphics - no personal experience of that.
I have both FO3 and FNV running smooth as silk in Windows 7, both with many mods, and the TTW conversion, and having used a radeon r7-250, gtx750 and now gtx1050ti.