the new 128GB model of ddr4 mem, if we used that and put into graphics cards, and make is 17GB/s wouldn't we no longer need GDDR?
what do you think?
The memory bus is quite different and it could be troublesome to put enough of DDR4 memory channels on a graphics card to facilitate the 512bit buses that top performing graphics cards use alraedy. Everything is much more parallelised on graphics card than on a CPU. Going forward to gaming on 4K displays we're beginning to need something to replace GDDR5 anyway. One can't just keep widening the bus.
Well, a Radeon R9 295X2 has memory bandwidth up to 640 GB/s and a R9 290X up to 320 GB/s so I don't think 17 GB/s is going to do much for a graphics card. You have to remember system RAM and video RAM are really different beasts.
The iterations done on a GPU to bring you that 60fps/120fps goodness require a staggering amount of memory bandwidth, given the simplicity of the GPU core architecture they have very little cache, meaning they rely on their memory a fair bit more than a CPU.
Along with that drawing a 4K image requires a bucketload of memory at very high speed to be able to function smoothly.
If 17GB/s was sufficient all GPU would be using GDDR3 @2200mhz on a 128bit bus.
seems like i got some basic concepts wrong... thx for the correction!