GeForce 210... Well there lays the problem. I wouldn't use the phrase "gaming PC" alongside one of those. Great for media centers, hopeless for gaming.
To put it simply, the 210 was slower than ALL of the old GeForce 8/9 series, slower than most the 7 & 6 series too... And the crappy FX series... Infact it's only just a smidge faster than the ancient Ti 4200 (a 2002 card).
You aint gonna get anything to run at a good speed on that, granted it supports newer DX versions & had better vertex/pixel shader support, but that doesn't mean it's suitable for gaming.
TBH I'm surprised it's ever managed more than 30fps with shaders on, let alone RTRT.
Also I'd stop calling it by the name on the case, your PC's had it's mobo & pretty much everything changed since.
Note - I know all about how shite 210's are because I have one sat in a media center & lol'd when testing TB on it.