this is the nice bitThe preconfigured models are not cheaper, but it is better value for the 15" GPU. They have upgraded the GPUs to the next level, so the 2GB 555 is standard on the entry config and the 4GB 560 is standard on the higher end.
In fact they've done it with dGPUs across the board, the BTO GPU is now standard on the higher end config and all other GPU models have moved down. They seem to be paying attention to graphics again.
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Thats true (although there is a very very small improvement) but they do have better dGPUs in the preconfigured models because the 555 and 560 are the standard GPUs, rather than 450 and 455 last year.