This has got me thinking though what if the motherboard chipset could affect things as well.
In the example for my laptops, what are the chances the intel CPUs / HD530 are completely different? Why would intel not 'cut and paste' the same HD530 each time etc. The laptop boards though are likely different, I'm not sure how I can check the chipset though.
the cost of testing all this soon mounts up though, new motherbaord, new cpu, graphics, power supplies, case etc…