I just don't see Apple wanting to break a set TDP.
the 750M with 2GB is reportedly $100. On top of an expensive 5200 Iris Pro chip. It would drive costs up on the rMBP.
there is no breaking of a set tdp the only break would be to go for the 5200 only.
the 5200 is more expensive, but its a clear cut design that apple has been wanting for a long time from intel, they will use it.
I still don't see a rmbp with only the igpu, there will probably be a model with only that, but I don't think there won't be a model without a dgpu.
in terms of costs, no one knows the cost of a dgpu, really no one knows except oems. that guess from anandtech and other educated guesses are only that, guesses.
gpu for mobile are more expensive, given that they are higher binned, with lower volume and aren't distributed as widely as desktop ones among several manufacturers.
aside that their applications are custom unless you are talking about mxm, which on the other hand is filled with even higher binned and much more expensive gpus, clear example is the price of the 780m which is around 900 right now.
for example I can sell a lot of 650 on desktop, its the same damn core of the 640m LE/640m/645m/650m/660m/k2000m/730m/740m/745m/750m, however the lets go for how many use the 640m LE, I only know 2 notebooks that use it, thats it.
the 750m I only know of 2 that use it, and in different configurations, one is DDR3 which means the core is higher binned, and the other is GDDR5.
the 760m there is only 1 notebook.
765m there are several, however in different configurations as well
the most widely used model is the 650m that was used in a lot of notebooks last year, I think there are at least 10 models with, then we need to break down on how many one sell of those, which for a model is around 100k-300k units, that means that some that doesn't even have the dgpu, for example the HP dv6t did have one that had the 630m (if Im not mistaken it was that gpu). Then we also have a lot of mix and matches there with DDR3 and GDDR5 models. Aside that those notebooks were always nearing the 1k area, so that means that they may not sell the average expected...
in the end the cost to produce a dgpu is known only to some, the cost for the oem is known only by the oem and some others
that is also valid for each and every component there, apple uses just a handful of cpus for their line up, you will pay a bit more than the average oem because you don't sell the garbage of the i3 and lower, since they are that lower binned cpus that can't be i5 or i7 dual cores, however due to the volume that they buy those things and the contract to move to intel one can't speculate how much they actually pay for each cpu or gpu or HDD or whatever
With all that said one must remember that each and every product that apple makes is bound to have a high margin, they aint in the business to dispute price, they are in the business to sell the desire of the product and to try to satisfy the niche that buys those products
So no I don't believe that a 750m costs only 100, the price for apple is going to be different from hp, or for clevo
