You could use some Hardware Info tool to know the MB Model and search it online.
I've seen some Laptop models share the same one whitin a Laptop series but with some differences.
I have seen, it's an i7 4th Gen, so maybe there's no better combo.
You may consider to check a new laptop since the CPU and the MB would cost part of another but you'll be stuck also on old hardware.
Apart on battery capacity and screen quality.
Here, seems to be adding a QuadCore.
Now I've seen there's an i5 version, so not sure if yours is Dual or Quad.