I think having at 1.65 makes it deteriorate over time. If you care for her then drop it down a bit.
Credit to Lozza.
Originally Posted by Lozza
More volatge demands more from your PSU too, which could also damage it in the long term or cause instability.
An increase in voltage will also increase "tunneling" inside the CPU. There is a FAQ on this in the FAQ section, but it basically means your gates in the CPU are buggering up because of electrons going mental. This is not measurable in temperature, so it will kill 'em without you noticing. There are many other sensitive parts in the CPU, which all suffer from increased voltage.
This is why 1.6v is a bit too much for standard air cooling - even if your temps are good.