SK Hynix’s updated memory catalog features HBM2 and GDDR6

Published: 15th May 2017, 15:32 GMT   Comments

SK Hynix updated its databook with the latest information about HBM2 and GDDR6 memories.

High-Bandwidth-Memory 2: From Q3 2016 to Q2 2017

Starting with HBM2, I think it’s worth to look at the past databooks first, to have a better understanding why HBM2-based products were not available sooner.

HBM2 was first expected in the third quarter of 2016, only to be pushed back to Q1 2017 six months later. The latest databook suggests that HBM2 will be available this later quarter. It’s important to note that it does not say ‘Available: Now’, which means HBM2 was not available at the time of making this databook (May 5th to be exact). This might be the main reason why there is no Vega yet.

High-Bandwidth-Memory 2
Q3 20164GB256 GB/s2.0 GbpsQ3 2016
Q3 20164GB204 GB/s1.6 GbpsQ3 2016
Q4 20164GB256 GB/s2.0 GbpsTBD
Q1 20174GB204.8 Gb/s1.6 GbpsQ1 2017
Q2 20174GB204.8 Gb/s1.6 GbpsQ2 2017

Assuming that Radeon RX Vega was to feature HBM2 from SK Hynix, then we should expect a minimum bandwidth of 410 GB/s. Of course, this is just an illustration, Vega could easily have 4 stacks which would double the bandwidth and capacity.

HBM-based Graphics Cards
VideoCardz.comTesla P100Tesla V100Radeon RX VegaRadeon R9 Fury X
HBM Stacks442 (?)4
Memory Bus4096-bit4096-bit2048-bit  (?)4096-bit
Memory Speed1.4 Gbps1.76 Gbps1.6 Gbps (?)1.0 Gbps
Memory Bandwidth720 GB/s900 GB/s410 GB/s (?)512 GB/s
Memory Capcity16 GB16 GB8 GB (?)4 GB
Q3 2016
Q4 2016
Q1 2017
Q2 2017

GDDR6 up to 14.0 Gbps

Now let’s move on to products that are still far far away. SK Hynix currently expects GDDR6 memory to be available in the fourth quarter. The datasheet confirms that only two variants are in the making, both 8Gb (1GB). The difference is hidden in the frequency, the faster variant is to feature 14 Gbps interface, while the other is estimated at 12 Gbps. This means that at best we should get 672 GB/s bandwidth with 384-bit bus or 448 GB/s with the 256-bit bus. That’s a significant increase over GDDR5-based solutions.

Hypothetical GDDR6 products vs GDDR5X vs GDDR5
384-bit memory bus
Bandwidth672 GB/s576 GB/s528 GB/s480 GB/s384 GB/s
256-bit memory bus
Bandwidth448 GB/s384 GB/s352 GB/s320 Gb/s256 GB/s


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