![]() The other benefit from the new GPU is obviously things run a lot cooler, which as I’ve already shown to considerably reduce thermal throttling under load.Īt 1440 x 900 we actually see a regression compared to the 2011 models, but differences in the AMD and NVIDIA GPU drivers alone can account for the difference at this hardly GPU bound setting. The real world impact is most noticeable at higher resolutions, thanks to the tremendous amount of memory bandwidth now available. ![]() ![]() The resulting difference is 80.3GB/s of memory bandwidth vs. While both the GT 650M and the 67xxM feature a 128-bit GDDR5 interface, Apple clocked AMD’s memory interface at 800MHz compared to 1254MHz on Kepler. The memory bandwidth story is also better on Kepler. NVIDIA also clocks the cores much higher in the 650M, the result is a ~20% increase in theoretical raw compute power. The GT 650M offers fewer “cores” compared to the 6750M and 6770M used in previous MacBook Pros, but likely better utilization of the available hardware. The result however is a significant improvement in performance over the Radeon HD 6750M used in the previous generation model. We’ve already established that NVIDIA’s Kepler architecture is fast, but the GeForce GT 650M used in the rMBP is hardly the best NVIDIA has to offer.
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