Wow this website is becoming the OLD WCCF tech. All rumors>full BS.
So what is your source OP? you dreamed it last night and made it a news?
You guys should use your brains and if you dont have a brain such as OP, then use LOGIC. 128bit is for low end cards. GTX 960 will have 256bit bandwidth just as GTX 760 and 4GB of ram. While 128bit will be left for GT cards or something like GTX750Ti's.
And at least i can provide proof. It's right there on Zauba. That's an official shipment stating 256bit-4gb of ram versus your stupid rumor. Which one shall we believe hmmmm.