The GPU: Faster

The GPU was the main recipient of Apple's attention for this upgrade. The old entry level model shipped with a pretty disappointing AMD Radeon HD 6490M. Apple has since upgraded the entry level 15-inch model to the Radeon HD 6750M, more than doubling its compute horsepower and memory bandwidth. Memory capacity has doubled as well to 512MB. I don't believe 512MB is ideal if you're going to be driving an external 27-inch panel, but for use on the notebook's screen alone (even at high res) you should be fine.

Discrete GPU Options
  AMD Radeon HD 6750M AMD Radeon HD 6770M
Manufacturing Process 40nm 40nm
SPs 480 480
Texture Units 24 24
ROPs 8 8
Core Clock 600MHz 725MHz
Memory Bus Width 128-bit 128-bit
Memory Clock 900MHz 900MHz?
Frame Buffer 512MB GDDR5 1024MB GDDR5

The upgraded configuration now comes with a Radeon HD 6770M. The 6770M increases shader clock but not the number of processors on the GPU. Memory bandwidth may be improved, it depends on what memory clock Apple decided on - by default the memory interface is no faster than the 6750M. The bigger difference for non-gamers will be the 1GB framebuffer that comes with the 6770M. If you're going to be using a 27-inch display, you'll want this GPU.

I tested the 6750M in the $1799 model and found it generally comparable to the 6750M in the old upgraded setup. The old 6490M is much slower and thankfully, out of the picture:

Half Life 2: Episode 2 (Mac OS X)

Half Life 2: Episode 2 (Mac OS X)

Starcraft II - AT GPU Bench (Mac OS X)

Starcraft II - AT GPU Bench (Mac OS X)

Starcraft II - AT CPU Bench (Mac OS X)

Starcraft II - AT CPU Bench (Mac OS X)

Silicon Updates Display Quality & Peripherals
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