I maintain that if you're buying a card, today, and you want to keep it for more than a year, a 7770 would be a silly choice.
And look at all the cards at the top of the chart.
The one consistent feature they all have is gobs of GPU bandwidth.
The HD77xx (and HD57xx, for that matter) have some of the lowest bandwidth numbers in the entire chart.
Further, the chart-toppers also have high price tags - not one of the Top Ten is priced under $200USD.
Even most of the middle of the chart has consistently remained at or near that $200USD price.
Basically, Crysis 3 (in MP Alpha form) is a GPU bandwidth pig.
However, the bottom of the chart does show a surprise - the GTX550Ti loses (albeit barely) to the HD7750 - which makes no sense for two reasons; the GTX550Ti has more bandwidth, and the HD7750 relies only on the PCIe bus for power (and costs less besides). Care to explain that? (Or even the HD7770 beating both the HD6790 and HD6850 - two GPUs that trump the HD7770 in bandwidth; that is also rather difficult to explain.)
And games change from Alpha to beta - Crysis 2 was plenty of evidence for that.
Seriously, we will need a re-testing with closer-to-release code to see if the chart holds up.