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There just isn't enough memory bandwidth. Afaik dual-channel DDR5 still can't hit 100GB/s? Meanwhile the $270 RX 7600 has 288GB/s on-board memory.
by sapiogram 3y ago
There just isn't enough memory bandwidth. Afaik dual-channel DDR5 still can't hit 100GB/s? Meanwhile the $270 RX 7600 has 288GB/s on-board memory.
- bryanlarsen 3y agojwells89 says "onboard memory", by which I assume they mean on-package memory like the Apple Mx. The M2 Ultra has 800 GB/s of memory bandwidth...
- adgjlsfhk1 3y agoDDR5-6000 is 60GB/s per channel.
- jauntywundrkind 3y agoIt's 48GB/s, scaling up from -4800 being 38.4GB/s, according to https://www.servethehome.com/guide-ddr-ddr2-ddr3-ddr4-and-ddr5-bandwidth-by-generation/ https://www.servethehome.com/guide-ddr-ddr2-ddr3-ddr4-and-dd.... Pretty sweet but yeah we kind of need a big jump to get near GPU grade. Intel's Lunar Lake mobile due out this year is supposedly using 16GB or 32GB on-package LPDDR5X RAM. Rumor has it it's 8533MHz. That'd be 68.2GB/s. https://www.tomshardware.com/tech-industry/manufacturing/intels-lunar-lake-cpus-to-use-on-package-samsung-lpddr5x-memory https://www.tomshardware.com/tech-industry/manufacturing/int... Still feels like we need more ram bandwidth. In general I think throughput is the new moat, the new market segmentation; consumer cores now have gobs of CPU and GPU (albiet we seem to have plateau'ed), but limited PCIe and ram bandwidth. We kind of started seeing USB4 compelling some more bandwidth, but I think even Intel is no longer offering USB4 on chip in many upcoming mobile chips, so that's kind of been defeated too. Anyhow, AMD's next Strix Point is due end of year or there-after, but then their big Strix, Strix Halo has quad channels. That'll be exciting as heck. Folks may finally get their console crushers, perhaps.
- adgjlsfhk1 3y agooh the 60 was me trusting wikipedia which I think must have been counting the 10 bits before the on die ecc vs the 8 after.