I doubt that you can damage memory while running @ 1.75V as most IC on market are designed for ~1.65V +/- 0.1V so 1.75V is about max. New IC have a bit lower voltage but still you can find memory on the same chips in 1.35-1.65V sticks. Other thing is that most new IC are not scalling well above 1.65V and some don't like 1.6V+ so maybe you won't kill them but you can lose stability.
Elpida, Micron, Qimonda and some other IC are running fine till 1.8V. PSC, Hynix and Samsung like lower voltages like 1.35-1.65V ( even that PSC are sometimes labeled as 1.55-1.75 then most are almost not scalling above 1.7V on air cooling ) ... That's just my experience and I can be wrong about some IC.
Damaging IMC by too high memory voltage is Intel's theory ( remember that they weren't even sure if it's true when they said that but you can see it in specification for Intel 6 series chipsets ). I haven't seen anyone damaging IMC on P67/Z68 board running memory @1.7V+ and I was running some sticks @1.8V for long tests and ~1.7V 24/7.
If sticks won't overheat then I see no problem. There is almost no difference in performance on FX if you run memory @CL7 or CL9 so I see no point to heat up memory with 1.75V. Better try to set higher CPU-NB that is easier to stabilize than memory@2133 and gives better results.