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Good read. It's sad that we have to resort to soldering components that used to be easily replaceable. Side note, you all might like @dosdude1 videos: https:/
by inversetelecine 2y ago
Good read. It's sad that we have to resort to soldering components that used to be easily replaceable.
Side note, you all might like @dosdude1 videos:
https://www.youtube.com/@dosdude1 https://www.youtube.com/@dosdude1
Lots of Mac SSD upgrades, and some vintage stuff to boot.
- Rinzler89 2y ago> It's sad that we have to resort to soldering components that used to be easily replaceable Those memory components are now operating at much, much higher frequencies than in the good old days, and need to be mounted closer and closer to the compute units to reduce latency, making soldering them the easiest way for reliably achieving those frequencies and latencies for best performance. Especially when you look at high end (g)DDR5 frequencies for APUs and what Apple is cooking with the Mx chips. There's no way you can easily get that using DIMM slots, so soldering it is. Yeah we used to even have memory slots on GPUs back in the '90s, but those days are long gone now and it's not all due to planned obsolescence but simply due to the performance requirements whos goalposts have moved leagues and bounds since then.
- fsflover 2y agoAre you saying that the RAM on my Librem 14 is slower, because I can easily upgrade it?
- Rinzler89 2y agoI never said that. Read my comment again please.
- prmoustache 2y ago> Those memory components are now operating at much, much higher frequencies than in the good old days, Not arguing about the latency but the chips that have been soldered in that article are operating at much, much lower frequencies than some DDR5 DIMMs you can buy to slot on a desktop mainboard supporting an Intel Raptor Lake or Ryzen 7000 series CPU.
- Rinzler89 2y agoI was talking about modern day designs with high frequency and low latency memory, not that older laptop in particular. Plus, isn't that laptop also thinner than models with slotted RAM? If you're chasing thinness then soldered is the only way to go even if you're not yet limited by frequency/latency.
- patrick451 2y agoDesktops and servers are still doing just fine without soldered RAM.
- Rinzler89 2y agoThey are using slower ram. You're comparing apples to oranges. Look at the performance per watt of a modern laptop compared to a desktop or server with slotted components. Performance per watt and energy efficiency goes hand in hand with tighter integration of components.
- ac29 2y ago> Especially when you look at high end (g)DDR5 frequencies for APUs and what Apple is cooking with the Mx chips. There's no way you can easily get that using DIMM slots, so soldering it is. Apple's latest M3 processors use LPDDR5-6400. There are systems with socketed memory that do DDR5-6400, so I am not sure what you are talking about. In the server space, Intel's latest Xeons support MRDIMMs at 8800MT/s, which is even faster.
- Rinzler89 2y agoInteresting. Is there any comparisons on the difference in latencies at which those memories operate? I assume Apple's memory operates at lower latency due to it being directly on the CPU package rather than in a socket on the motherboard.
- ac29 2y agoI'm not sure if Apple is able to run tighter timings with on package memory. Maybe? The main advantage I am aware of with on package RAM is lower power consumption. Shorter traces means the memory controller PHY uses less power.
- rangestransform 2y agoM3 Max has 8 memory channels, where are you going to put 8 SODIMM slots in a laptop? Also LPDDR has lower power requirements than DDR
- ac29 2y agoYeah, this is where Apple has an advantage. It doesnt use special RAM, but what it does do is give you more than 2 channels in a laptop (on Pro/Max/Ultra). LPDDR5 does use less power than DDR5, but what I was specifically referring to is the claim that Apple gets higher frequencies than you could get with slotted memories. This isnt true.
- Crosseye_Jack 2y agoI can't remember which manufacturer it was (iirc it was either Dell or HP), but I recall a couple of engineers from that manufacturer being on a podcast saying that their DOA RMA rates dropped dramatically after switching to soldered RAM. One compromise I've seen in laptops is to have both soldered ram and a SODIMM socket. Stock config comes with soldered ram giving the end user the ability to add more ram as required. CAMM2 modules could / _should_ help in returning replaceable modules to laptops and keep the benefits of having the ram mounted closer to the cpu, but at the cost that its (atleast atm) only a single module, so if you were upgrading from (for example) 8gb to 16gb, you would be left with a unused 8gb module and try and sell it on the resale market.
- rangestransform 2y agoit would take 4 CAMM modules to have enough memory bandwidth to match M1 Max where are you going to put them in an appropriately thin chassis?