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December 16 is to be expected for us to get the chips. Testing time varies at 3-10 days since we had much more preparation work already done this time.
Doubtful, we are one week from receiving Gen4 sample chips, and another 7-10 days from testing results if AM releases the information to us before 2015.
So it's most propably that we'll hear before end of the year how Gen4 performs.