Victor,

I cannot speak from own experience cuz i don't have a 45nm cpu nor do i have DDR3.
From observation it looks like the large cache on the 45nm cpu's is responsible for the great performance in SuperPi but the downside is that tweaks like copy-waza take less effect.

Looking back at A64 days with 512mb cache CPU's, copy-waza gave some impressive gains, even in 1M, which reinforces the feeling that more cache means less gain from CW.

For DDR3, it looks like this is only taking a lead over DDR2 when ran at outrages speeds and relative tight timings.
Running more relaxed than 6-7-7 on DDR3 does not give any gain over DDR2 imo.