My one and only guess was 2.5 3.2 http://forums.anandtech.com/showthread.php?p=38267634 No surprises here imo. And i expect relatively weak smt too. Where i do disagree is the st ipc assessment you do and build perf estimates on. Based on some ppt and weak pr talk? I think when they are gunning for broadwell ipc on integer - and why shouldnt they especially that wide - thats more or less what they will get. Hsw integer st ipc in cb. Fp more like ivy. Efficiency will be the key. Then total system cost.