Thinkpad T440s: Haswell to Broadwell is fairly minor from a performance point of view but
New arrival T450s. Next to t440s. I'll be selling the T440s in favor of the newer broadwell T450s. Haswell to Broadwell is fairly minor from a performance point of view but Broadwell supports 16Gb DIMMs where as Haswell supports only 8. Meaning T450s supports 20Gb of RAM and T440s only 12Gb. They both have 4Gb built in non removable
It is worth noting that every single component in these machines are interchangeable
Why you move from 440s to 450s, it’s nearly the same. You have more RAM but bus the same bus rate.
From my point of view, both are the same