Mac Pro with Nvidia H100

By: Sam G (samg.delete@this.gmail.com), June 22, 2022 12:06 am
Room: Moderated Discussions
> > There is no mention of ECC in the Tech Specs section of the Mac Studio page on Apple’s website.
> ECC is problematic to provide with LPDDR.

Micron LPDDR4 and LPDDR4x DRAM includes on-die ECC:

micron.com/about/blog/2017/february/the-advantage-of-ecc-dram-in-smartphones

LPDDR5 has Link-ECC. Inline ECC can be used with both LPDDR4 and LPDDR5 as described here:

semiengineering.com/what-designers-need-to-know-about-error-correction-code-ecc-in-ddr-memories

> It may become more scarce in general with DDR5 since the bit overhead doubles

You’re right about an ECC DDR5 DIMM being 80 bits wide, compared to 72 bits wide for an ECC DDR4 DIMM. As you know, this is due to the DDR5 data bus being split into two subchannels. All DDR5 DRAMs, whether on an ECC DIMM or a non-ECC DIMM, have on-die ECC, which is an additional 6.25% overhead. DRAM sizes are increasing with DDR5 so ECC is more essential.
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M2 benchmarks-2022/06/15 12:27 PM
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                        Mac Pro with Nvidia H100Doug S2022/06/17 10:37 PM
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      M2 benchmarks-DDR4 vs DDR5Doug S2022/06/16 09:58 AM
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