JEDEC, the organization responsible for new standards of micro-electronics, announced an update to the specifications of the second generation of High Bandwidth Memory (HBM2) which will be used by both AMD and NVIDIA in the next generation of graphics cards.

 Specifications of High Bandwidth Memory (HBM2)

HBM2-vs-HBM1

According to JEDEC, the HBM2  memory, will be available with stacks of 2, 4 and 8 levels, this means that the capacity can vary from 1 to 8 GB per cell. According to these new specifications, if AMD or NVIDIA decided to use four stacks in its Polaris or Pascal  graphic card, so we will have a Graphics card with up to 32 GB of memory, although it will be very unlikely to see in consumer grade gaming graphics card, but we could see such capabilities in multiple professional graphics cards.

GPUs and CPUs continue to drive demand for more memory bandwidth and capacity, amid increasing display resolutions and the growth in computing datasets. HBM provides a compelling solution to reduce the IO power and memory footprint for our most demanding applications.

Depending on the configuration taken by the manufacturer, we will have graphics cards with a bandwidth of 256, 512 or 1024 GB / s. In the below graph you can see the performance and capacity of the stacks depending on the number of layers used.

Standard High-Bandwidth-Memory 2
Variant Layers / StacksDisplayCapacity (Layer / Stack / Total)Bandwidth
2-Hi 512 MB2 / 1[||]512 MB / 1 GB / 1 GB256 GB/s
2-Hi 512 MB2 / 2[||]  [||]512 MB / 1 GB / 2 GB512 GB/s
2-Hi 512 MB2 / 4[||]  [||]  [||]  [||]512 MB / 1 GB / 4 GB1024 GB/s
2-Hi 1GB2 / 1[||]1 GB / 2 GB / 2 GB256 GB/s
2-Hi 1 GB2 / 2[||]  [||]1 GB / 2 GB / 4 GB512 GB/s
2-Hi 1 GB2 / 4[||]  [||]  [||]  [||]1 GB / 2 GB / 8 GB1024 GB/s
4-Hi 512 MB4 / 1[||||]512 MB / 2 GB / 2 GB256 GB/s
4-Hi 512 MB4 / 2[||||]  [||||]512 MB / 2 GB / 4 GB512 GB/s
4-Hi 512 MB4 / 4[||||]  [||||]  [||||]  [||||]512 MB / 2 GB / 8 GB1024 GB/s
4-Hi 1 GB4 / 1[||||]1 GB / 4 GB / 4 GB256 GB/s
4-Hi 1 GB4 / 2[||||]  [||||]1 GB / 4 GB / 8 GB512 GB/s
4-Hi 1 GB4 / 4[||||]  [||||]  [||||]  [||||]1 GB / 4 GB / 16 GB  1024 GB/s
8-Hi 512 MB8 / 1[||||||||]512 MB / 4 GB / 4 GB256 GB/s
8-Hi 512 MB8 / 2[||||||||]   [||||||||]512 MB / 4 GB / 8 GB512 GB/s
8-Hi 512 MB8 / 4[||||||||]   [||||||||]  [||||||||]  [||||||||]512 MB / 4 GB / 16 GB1024 GB/s
8-Hi 1 GB8 / 1[||||||||]1GB / 8 GB / 8 GB256 GB/s
8-Hi 1 GB8 / 2[||||||||]  [||||||||]1GB / 8 GB / 16 GB512 GB/s
8-Hi 1 GB8 / 4[||||||||]  [||||||||]  [||||||||]  [||||||||]1GB / 8 GB / 32 GB1024 GB/s

DDR3 vs GDDR5 vs HBM1 vs HBM2
DDR3GDDR5HBM1HBM2
I/O163210241024
Prefetch (per I/O)8822
Max. Bandwidth4.3GB/s
(2133 per pin)
32GB/s
(8Gbps per pin)
128GB/s
(1Gbps per pin)
256GB/s
(2Gbps per pin)
tRC4x – 5xns40ns(=1.5V)
48ns(=1.35V)
48ns45ns
tCCD4ns (=4tCK)2ns (=4tCK)2ns (=1tCK)2ns (=1tCK)
VPPInternal VPPInternal VPPExternal VPPExternal VPP
VDD1.5V, 1.35V1.5V, 1.35V1.2V1.2V
Command InputSingle CommandSingle CommandDual CommandDual Command

via: Videocardz

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