JEDEC Publishes GDDR7 Graphics Memory Standard

Re:JEDEC Publishes GDDR7 Graphics Memory Standard by bgnn on Wednesday March 06, 2024 @02:40AM (#39613336)

10G-baseT ethernet uses 128-DSQ modulation (LDPC coded). It's 128 symbols sent over 2 cycles.

These complex modulations have a huge drawback though: latency. You need to pack, ramdomize, encode and modulate at the transceiver, and undo all these + equalization at the receiver. Especially feed-forward equalization is a huge latency source.

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Re:JEDEC Publishes GDDR7 Graphics Memory Standard by silvestrov on Wednesday March 06, 2024 @03:44AM (#39613728)

Some numbers here: https://wavesplitter.com/technical-column/latency-and-power-...

> Cable latency is about 5ns/m, so 2.6 µs is equivalent to latency of a 520m cable. This latency might become a big issue for the HPC-based applications.

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Re:JEDEC Publishes GDDR7 Graphics Memory Standard by bgnn on Wednesday March 06, 2024 @12:48PM (#39618615)

10GBASE-T is rated up to 300m cable. I don't think these numbers include 300m cable latency. It's just the PHY latency itself.

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