I'm actual in partial agreement with cordas here, if you're only running a few very specific bits of software, you don't need a gig of memory or a superfast processor esp when the bit of software is well written and streamlined.
And why would you want to run a simple streamlined bit of software on an OS which is far more demanding?
It's a bit like using a lorry to just pop to the shops because it can carry more.
And if you're buying multiple computers for a company the last thing you want to do is get lots of old 2nd pc's each of which will be different, even if they are faster than your current ones.
The danger thoe of just replacing one when it breaks is that you will often end up in the same mixed bag of pc situation because stuff goes EOL so quickly these days.
speaking from experience here.