Details from Photos at Semiaccurate : XBox One details in pictures. Comparing the Xbox One SOC (as detailed by the above link) to AMD's HD8970 and HD8760 chips (stats according to wikipedia),
SPEC ..... XBOXONE HD8760 HD8970
---------- ------- ------ ------
nm ....... 28 .... 28 ... 28 ...
mm2 ...... 363 ... 123 .. 352 ..
Tflop/s .. 1.3 ... 1.3 .. 4.3 ..
Gtex/s ... 41 .... 40 ... 134 ..
From a prior post for comparison, a single ARM A15 CPU is roughly 1.62 mm2 at 28 nm.
SPEC ..... XBOXONE HD8760 HD8970
---------- ------- ------ ------
nm ....... 28 .... 28 ... 28 ...
mm2 ...... 363 ... 123 .. 352 ..
Tflop/s .. 1.3 ... 1.3 .. 4.3 ..
Gtex/s ... 41 .... 40 ... 134 ..
From a prior post for comparison, a single ARM A15 CPU is roughly 1.62 mm2 at 28 nm.