The 1400 has no Open firmware and uses the NUBus.

This means it doesn't run much recent Mac OS versions.

RAM can't be more than 64MB(I didn't say it)

A patched Linux kernel is available for NUBus macs.

The 1400 has no 3D acceleration built in.

It is more powerful than my 6100,but I wouldn't play that much

games on it.