Why can't AIB partners choose how much vram and what kind/brand/etc

>>59977573
Sometimes yes, sometimes no. Usually no.

>>59977573
Because memory controllers can only address a certain amount of GDDR modules and they're not made by the AIB partners

>>59977573
They do, I had a EVGA GTX 275 with 1792MB ram when they normally came with 896MB.

>>59979061
>>59977588
Those are dual PCB cards tho

>>59979089
It wasnt - https://www.newegg.com/Product/Product.aspx?Item=N82E16814130476

>>59979294
I'll rephrase my question then, why is it so rare?

>>59980079
Because to double memory, they need to use double density memory chips. This is expensive. Assuming the gpu vendor even allows it.

>>59977573
>Why can't AIB partners choose how much vram
They can and they do sometimes. I have 4gb GTX 670 and I remember seeing 3gb GTX 580.
>what kind/brand/etc
They can and they do. It is not that there are many brands to choose from. There are like 3 major ram manufacturers; Samsung, Hynix and Micron.

>>59980175
Is there some technical reason it has to be double (or half?)? Is it not possible to say, release a 6gb GTX 1070 or something?

>>59980289
DDR chips have 64bit bus. Every chip or a pair of chips is connected to its own memory controller on the GPU. So if you want 6gb GTX 1070 it will have 6 chips most likely. Those chips will be connected to 3 memory controllers making it total of 192bit wide memory bus.