Readit Newsnuriaion commented on Compression Attached Memory Modules may make upgradable laptops a thing again arstechnica.com/gadgets/2... · Posted by u/WithinReason
What does the "Compression" in the name mean? Is it compressing data, RAM Doubler style? Or does it mean the physical form factor is smaller? Or what?
It's physically pressed down to the pads on the motherboard with screws.
Does the writer really think laptops are not upgradeable because of technical issues? Laptop makers convice people to buy more computer than they need as they can't be upgraded, making more money and waste in the process.
There is an issue if you want to create a small laptop with a long battery life as SODIMM will use more space and power as LPDDR. (The SODIMM module and connector are very bulky and have a bad electical layout. CRAMM will be somewhere between the two)
nuriaion commented on HVDC transmission line to connect three ISO regions pv-magazine-usa.com/2023/... · Posted by u/1970-01-01
HVDC can be made cheaper by making the voltage higher...
As voltage goes up, the thickness of metal needed goes down. The insulator thickness goes up - that either means taller towers or thicker plastic.
Conversion from regular AC grid voltages to high voltage DC was previously very expensive, with custom made semiconductors costing millions.
With the advent of electric cars, there are now off the shelf cheap power electronics. They can be stacked, perhaps 20x in package to get to 10kV, and then 100x packages to get to 1 million volts.
That should dramatically reduce the cost of moving large amounts of power long distances.
I think that would actually be more expensive as you still have the all the hard problems. Like how do you isolate the power electronics. You can use air which is cheap but needs a lot of space. (i learned that you need 1mm per 1kV)
You need a lot of space which has to be very secure.
etc
Additionally you need to control 5000 converters without getting oscillations etc. (probably over glas) Also they will probably need a lot more space.