AMD is working on gddr6 for video cards
AMD is working on using gddr6 for video cards, according to information a company technician has posted on his LinkedIn page. The company would use hbm2 for high-end cards such as the upcoming Navi generation.
AMD has skipped gddr5x but seems to be coming up with video cards with gddr6 memory. At least on LinkedIn, the profile of Daehyun Jun, principal member of the technical staff of AMD, stated that he has been working on a gddr6 controller since September 2015.
That passage has now been removed. 3Dcenter writes about it after a screenshot previously appeared on Beyond 3D. In turn, Wccftech claims to have heard from sources that AMD indeed equips video cards with gddr6, but that the cards for the high-end, such as the upcoming Navi generation, are equipped with hbm2.
Several memory manufacturers have already announced to come with gddr6. Samsung wants to produce gddr6 memory from 2018, Micron would have gddr6 memory ready this year and SK Hynix mentions early next year as an introduction period. The graphics RAM can handle a throughput of 16Gbit/s at a lower voltage than gddr5. The memory is cheaper to produce than hbm2.
| GPU Interface | flexible, up to 512bit | flexible, up to 384bit | flexible, probably up to 384bit | 1-4 stacks, per stack 1024bit |
| Clock speed | Avg. 4000MHz DDR, Max. 4500MHz DDR | Avg. 2750MHz qdr, Max. 3000MHz qdr, schedule: 3500MHz qdr | schedule: 16Gbit/s (= 4000MHz qdr) |
Avg. 880MHz DDR, Schedule 1000MHz DDR |
| Data transfer | Gdr (= x2) | Qdr (= x4) | ? | Gdr (= x2) |
| meh. bandwidth practice | 384GB/s (Radeon R9 390X) |
484GB/s (GeForce GTX 1080 Ti) |
– | 900GB/sec (Tesla V100) |
| max.mem. bandwidth | 576GB/s (4500MHz DDR @ 512bit SI) |
896GB/s (3500MHz qdr @ 512bit SI) |
1024GB/s (16Gbit/s @ 512bit SI) |
1024GB/c (1000MHz DDR @ 4096bit SI) |
| Memory amount | Up to 16GB | Up to 32GB | Still unknown | Up to 32GB (4 or 8GB per stack) |