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Very simple, its only allowed the weapon strength plus a 'single' D6 no matter what.

I also started a thread about the 'Living Metal' rule just over a week ago and it helps clarify what can and cant harm a Monolith, take a look, heres the thread...

http://www.dakkadakka.com/dakkaforum/posts/list/327625.page

Its the unaugmented strength of weapon and a single D6 no matter what the rules of the weapon firing state so it would be the 'normal' strength of the weapon, so 3 if from a sniper rifle as you say and a single D6, nothing else...

Nope would'nt do a thing due to the 'living metal' rule.

The last paragraph of the Living Metal rule on pg 21 of the Necron Codex..
'In practice, any weapon attacking the Monolith will roll for Armour Pentration using its unaugmented strength and a single D6 no matter what'

I'd suggest you check on the first page and see if it says Second Printing, mine says this right at the bottom but just above the addresses of GW, if not then you have an older codex as the paragraph i quoted directly follows what you quoted.

I've checked over the Necron FAQ 2009 which is the most upto date as per GW website and it still lists nothing extra about Armour Penetration with the Turbo Penetration, simply states that certain close combat weapons such as powerfists do double their strength for AP and thats all.

Nos when was the older FAQ dated from that specified the TP as the only exception?