if that a 750 @ 45c (load) in a 'silent' system I'd say he's doing really well.
if that 45c is the internal case temp of an inadible system in use (encoding, seti etc)
that's reasonable. (and there will be things you can do - but that are not cheap.
If that a internal case temp, with a i5 idle at night - just turn it off.
I have 2 SSD in my ultra quiet system - sit at around 40c without issue.
Most laptops with ssd have internal temps way above 50c.
As do media centres - SSD are in both more oftern that desktops
But it's new tech - in 5 years we'll know more (but the drive will be redundent by then)