Dened ES have HT on 2.4ghz.

Deneb AM2+ have NB on 1.8ghz.
Deneb AM3 have NB on 2.4ghz.

Remember HT clock is on par with NB clock.

That's why AM3 will be a bit faster.

I've choosen to buy an 945 with an AM3 board. 16go of DDR3 will be fine ( actually i'm using 8go ^^ )