Does AMD AI Max 395+ have 8 channel memory like image says it does?
Posted by Terminator857@reddit | LocalLLaMA | View on Reddit | 15 comments
Source: https://www.bosgamepc.com/products/bosgame-m5-ai-mini-desktop-ryzen-ai-max-39
Dexamph@reddit
Yes, it's technically correct as LPDDR5x uses 16 bit channels instead of 32 bit so it still works out to a 128 bit bus. They're just being tricky about it by not showing the bandwidth numbers
DeProgrammer99@reddit
It also says "Up to 8000Mbps," when it's 8000MT/s. 8000Mbps would only be 1GBps.
audioen@reddit
dmidecode on Linux reports 8 DIMM modules of 16 GB each. They are set in 8 different bank locator tags, which are marked ChannelA0, ChanelA1, ChannelB0, etc. until ChannelD1. This suggests to me that it has 4 channels, A-D, but with 2 modules per channel, and each module is reported as being 32 bit. Thus, I believe this is "really" four 64-bit channels with two DIMMs responding simultaneously per channel via interleaving.
mustafar0111@reddit
My understanding is Halo Strix has quad channel DDR5.
Some ads might be bullshit that its eight channel because DDR is double data rate.
Ok_Top9254@reddit
No, it's 8 physical chips and technically 2 to 8 dies inside them that even the datasheet calls dual channel, so you could go as far as to call it 16 channel. It really doesn't matter though because you access them in 4 chunks in software anyway...
Goldkoron@reddit
It's just marketing deception.
brown2green@reddit
The marketing definition of "channel" that has been incorrect since the DDR5 memory debut. They should really just be advertising the total memory bus width, as done with GPUs.
MitsotakiShogun@reddit
8 sticks, 4 channels. E.g. from Beelink's spec:
No-Consequence-1779@reddit
Once I pass three way, run out of limbs.
Rich_Repeat_22@reddit
395 has quad channel ram. 🤔
suicidaleggroll@reddit
4 channel. 4 channels * 64-bit interface * 8000 GT/s = 256 GB/s.
randomfoo2@reddit
It’s LPDDR5x not DDR5 so it’s technically 8 channels at 32 bit, but the effective bit width and bandwidth is the same.
Freonr2@reddit
I think they're trying to market it as as 8 channels of 32bit each instead of 4 at 64bit each.
I don't actually see the same layout in all block diagrams and can't find a clear answer either way.
Framework's technical drawing shows 8x32 here (top right of first page) but I'm unsure that is actually "channels" vs 32 data pins to each of the 8 memory module:
https://github.com/FrameworkComputer/Framework-Desktop/blob/main/Mainboard/Mainboard_Interfaces_Schematic_Framework_Desktop_Ryzen_AI_Max.pdf
Most of the other block diagrams I find online say it is 4x64 as does Techpowerup.
It's sort of academic because either way it is 256bit width in total.
I'd probably lean towards 4x64 because 64bit channels would align with controller configs on all of their other desktop and server chips. Either way, it is 256 bit in total across all channels and the difference is a bit academic.
hainesk@reddit
Probably a typo, but technically DDR5 has 2 32 bit channels per module x four dimm channels would make 8 channels, but it would be disingenuous to advertise it that way.
DataGOGO@reddit
No.