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Early draft GDDR7 JEDEC specification?

SharpX68K

SharpX68K

Member
Nov 10, 2017
10,518
Chicagoland
GDDR7 Memory Model provides an smart way to verify the GDDR7 component of a SOC or a ASIC. The SmartDV's GDDR7 memory model is fully compliant with draft GDDR7 JEDEC Specification and provides the following features. Better than Denali Memory Models.
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Features

  • Supports GDDR7 memory devices from all leading vendors.
  • Supports 100% of GDDR7 protocol draft JEDEC specification.
  • Supports all the GDDR7 commands as per the specs.
  • Supports 4 separate independent channels with point-to-point interface for data, address and command.
  • Supports Double Data Rate (DDR) or Quad Data Rate (QDR) data.
  • Supports Pseudo channel mode operation.
  • Supports up to 32GB device density.
more here: http://www.smart-dv.com/memory/gddr7.html

thread found here: https://hardforum.com/threads/h-exclusive-gddr7-hints.1994957/

Very cool. it the draft is being worked, I would expect final spec within a a year or two.

We will have to see how much further we can take GDDR6, but we knew it would be relatively short-lived! Even if they can push the standard to 20Gbps, it's not nearly the massive journey GDDR5 made (3.6 to 9.0 Gbps).
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I think the reason this has gotten so little leaked press is because, for the first time ever, GDDR has a true competitor in HBM2/e
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GDDR standards tend to mimic vanilla DDR standard in terms of cadence. GDDR7 likely implements many changes that has occurred between DDR4 -> DDR5.

I do wonder if this requires moving to a package-on-package topology as the GDDR6 currently has a rather short trace length. While I wouldn't say it is inherently possible, but a 512 bit wide implementation does not seem feasible on GDDR6. I wonder if GDDR7 would put a similar logistical challenge for 384 bit wide arrangements.
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Interesting huh.

GDDR5 lasted about a decade (2008-2018) including GDDR5X.

I don't think GDDR6 is going to last nearly as long.
 
OP
OP
SharpX68K

SharpX68K

Member
Nov 10, 2017
10,518
Chicagoland
By the time next-gen consoles come out, "HBM3+" and HBM4 should be in HPC products.

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I don't think the era of DDR / GDDR is over, but hopefully HBM will become cheap enough and easy enough to manufacture to go into future consoles.
I know we were saying that years ago, for the coming console generation. It didn't work out. And even Nvidia had to change their plans for Volta, originally supposed to use Hybrid Memory Cube (HMC) http://gpu.cs.uct.ac.za/Slides/stacked-DRAM.pdf but they switched to HBM2.
 
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