Penello specifies why X1vsPS4 performance difference is overstated

[Scoobes]

Adinnieken said:

petalpusher said:

That's not how mathematic works.

 

(1 CU x 853 mhz x 64 ops x 2 cycles)  x 12  

is still the same than

12 CU x 853 Mhz x 64 ops x 2 cycles

= 1 310 208 fl ops

 

A 72% increase would be this gpu at 1376 Mhz (and probably burn quickly)

No.  A GPU is parrallel.  Therefore CU's can run independent of each other.  I can have one CU running a job each clock cycle, and another running one job over 853 clock cycles.  Because those each of those CUs will reduce the time to run an operation, the effect of those savings become accumulative.  For example, @ 800GHz I wouldn't be able to run 1000 operations.    This means it's capable of running 57 more operations. 

PS4 1 CU @ 800MHz @ 943 operations per clock cycle
XB1 1 CU @ 853MHz @ 1000 operations per clock cycle

So, at the end of one minute.

PS4 1CU @ 800MHz @ 943 operations per clock cycle = 754,400 operations per minute. 
XB1 1CU @ 853MHz @ 1000 operations per clock cycle = 853,000 operations per minute.

98,600 operations more.  Or 105 more clock cycles to do the same amount of work.  That's a 12% difference in performance right there.  Not to mention, that's one CU.

If you take into account the greater number of CUs (18 vs 12) in the PS4 that still adds up to a nearly 25% advantage to the PS4 (multiplying your numbers by the number of CUs). Considering the way GPUs are designed and how they're generally suited and used for parralel processing, the PS4 still has a significant advantage.

That's without looking at the increased ROPs, texture and pixel fillrates or the added ASE's in the PS4.