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I can't believe how much we've been focused on core speed when memory bandwidth and latency has been such a huge issue... at least for my workloads. My stuff sc
by exabrial 4y ago
I can't believe how much we've been focused on core speed when memory bandwidth and latency has been such a huge issue... at least for my workloads. My stuff screams on a M1 Chip.
- wmf 4y agoAMD and Intel have the same 128-bit LPDDR5-6400 as the M2.
- dmitrygr 4y agoDo point me to an x86 laptop I can buy with 100GB/s of memory bandwidth to the CPU.
- wtallis 4y agoWhat exactly are you asking for here? Because you've already been informed that AMD and Intel systems using LPDDR5 at the same speed and bus width are now available. On paper, every new laptop using soldered LPDDR is now over 100GB/s for DRAM bandwidth. Are you asking for synthetic benchmark results comparing achievable throughput against theoretical bandwidth, or are you just being obtuse?
- dmitrygr 4y agoI am asking for a name of one that has been demonstrated to actually do that. Not promise. Not “on paper”. Actually do. Extra credit if it actually exists in a store to actually buy. Today.
- wmf 4y agoSuch information is no longer available due to the demise of tech journalism.
- dmitrygr 4y agoAnd yet somehow you are sure such things exist?
- wmf 4y agoLook, you're probably right but there's no need to be so annoying about it.
- dmitrygr 4y agoStop confidently making nonsensical claims, like this, then: https://news.ycombinator.com/item?id=35855612 https://news.ycombinator.com/item?id=35855612
- wtallis 4y agoThere's nothing nonsensical about the claim that there are AMD and Intel systems using 128-bit LPDDR5-6400. AMD's mobile processors started supporting that config last year, so in spite of this year's mobile processors being a bit late the market is already full of systems so equipped. Intel's mobile processors as of earlier this year also support this memory configuration and speed, and systems have been shipping from multiple vendors for well over a month; they're not exotic or hard to find. There's even at least one announced but not yet shipping Intel-based system that will use LPDDR5-7500!
- 2OEH8eoCRo0 4y agoIt's called "overfitting specs". They ask for a very specific set of specs that only Apple laptops have and ignore anything else. If you can find anything that competes they'll move the goalposts and complain about touchpad or something else.
- wtallis 4y agoSorry, still not clear exactly where your goalposts are. Is there a public benchmark where M2 scores above 100GB/s that you'd like to see comparable runs for a recent x86 mobile platform?
- rsynnott 4y agoNot sure about the M2, but here's one for the M1 Pro/Max: https://www.anandtech.com/show/17024/apple-m1-max-performance-review/2 https://www.anandtech.com/show/17024/apple-m1-max-performanc... For whatever reason, it isn't so easy to find real-world memory bandwidth results for consumer stuff; it's a fairly standard benchmark for server hardware, but less so for consumer. Here's one for an old Ryzen 9: https://www.anandtech.com/show/14605/the-and-ryzen-3700x-3900x-review-raising-the-bar/2 https://www.anandtech.com/show/14605/the-and-ryzen-3700x-390..., but couldn't find anything current offhand.
- Prickle 4y agoWhat kind of work are you doing to need that on a laptop of all things? The usage cases I am aware of are all better suited by non-portable computers dedicated to the task. That sounds incredibly specialized and I am needlessly curious.
- theage 4y agolocal LLMs
- fomine3 4y agoMemory bandwidth (not latency) on mobile SoC is for GPU. It's not very beneficial to have full 100GB/s bus for CPU.
- DarmokJalad1701 4y agoDoesn't M1 and M2 have on-chip memory? Even if it may be the same interface, doesn't the physical distance help make it significantly more performant?
- wmf 4y agoNope, the shorter distance makes no measurable performance difference. It does make the motherboard smaller though.
- spixy 4y agoI prefer option to upgrade RAM capacity over too high memory bandwidth