Logic Board 820-2936, 820-2935

2.3GHz i5 661-5869, 661-6078 (early 2011)
2.4GHz i5 661-6158 (late 2011)
2.7GHz i7 661-5870, 661-6079 (early 2011)
2.8GHz i7 661-6159 (late 2011)