jcu90 :
for piledriver expect 10-15% improvement over bulldozer.
see <http://forums.anandtech.com/showthread.php?t=2236988>
socket lga 2011 is the way to go. an i7-3820 and a mobo <like p9x79 pro> will set you back about 400 gbp. seriously outperforms bulldozer, and should outperform piledriver or atleast be on par, though no results to compare as of yet.
plus ivy bridge e is due for release q3 2013, and from whats known so far also on lga 2011, so nice upgrade path.
Did you not read the above post / comments? We're talking best
increase in performance for the money spent, not the absolute best performance period. As he already has a high performance feature rich board it will cost him more to go the Intel route then just staying with AMD. We already PD will be 15% faster then BD which puts it quite a bit faster then he has now (assuming it's tweaked / OC'd).
So $200 ~ $250 for top end PD that drops straight into his AM3+ board or $200 + $200 (i5/i7) for a new Board / CPU for the Intel option. If he wants a significant upgrade he's talking LGA2011 and their obscene board / CPU costs.
To the OP: Your in the same situation I'm in.
AMD 970BE @ 4.1~4.2Ghz (can get 4.3 if I force down clock other cores)
Asus Sabertooth 990FX board
16GB DDR3-1600
2 x EVGA GTX 580 Hydro's
256GB Samsung 830
I'm waiting to see what PD brings to the table. It'll either be upgrading to PD or waiting till summer ~ fall 2013 to do a system refresh and get a new board / CPU.