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A comment on Micron Samples 256 GB DDR5-8800 MCR DIMMs: Modules for Servers. Parent comment

Re:Micron Samples 256 GB DDR5-8800 MCR DIMMs: Modules for Se... by samcheng on Saturday March 23, 2024 @01:20AM (#39797663)
What about Apple's M-series chips, which have on-die RAM? Is that RAM significantly more expensive per GB due to the more expensive process?

(It's certainly exorbitantly expensive for retail consumers at $200 for an 8 GB RAM upgrade on a Macbook!)

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Re:Micron Samples 256 GB DDR5-8800 MCR DIMMs: Modules for Se... by wmf on Saturday March 23, 2024 @01:27AM (#39797701)
Apple does not have on-die RAM. The SoC is a normal logic die and the RAM is regular DRAM.
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Re:Micron Samples 256 GB DDR5-8800 MCR DIMMs: Modules for Se... by samcheng on Saturday March 23, 2024 @01:54AM (#39797785)
Ah - I see, the DRAM is literally BGA'd right next to the die. So that $200 upcharge is mostly profit... Thank you!
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Re:Micron Samples 256 GB DDR5-8800 MCR DIMMs: Modules for Se... by vbezhenar on Saturday March 23, 2024 @04:01AM (#39798271)
It's called "package on package". The RAM is different chip, however it's located very close to the CPU chip and both are under a single cover. The end result is a "package".

I think that GPUs use similar approach.

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Re:Micron Samples 256 GB DDR5-8800 MCR DIMMs: Modules for Se... by RF_Savage on Saturday March 23, 2024 @12:21PM (#39801001)
AMD Vega used HBM next to the GPU die, but most GPU manufacturers are now back to discrete chips on the GPU circuit board.
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