SigmundA

62 ms·

781.
by SigmundA 5y ago
I had the issue when going from driving my two 4k monitors with usb-c directly to going through a thunderbolt 4 hub that then did HDMI out (Caldigit). After some searching it seems HDMI conversion can trigger it. Switched to a TB4 hub that
782.
by SigmundA 5y ago
Previous discussion: https://news.ycombinator.com/item?id=27218029
783.
by SigmundA 5y ago
Really a $100 for 900 amp input 450 amp output boost DC power supply?
784.
by SigmundA 5y ago
CCS chargers above 50kw are usually liquid cooled as well. Above 200amps it really needs it for manageable cable size and CCS goes to 500 amps while Tesla goes to 800 amps. CCS goes to 1000v too which is theoretically 500kw.
785.
by SigmundA 5y ago
Nice site, only about 250 total, Wyoming, South and North Dakota have none, closest one near me in Florida is about 40 miles away. Is amazing how fast the infrastructure is going in. Seems much easier to build charging stations than gas sta
786.
by SigmundA 5y ago
Are you sure? They clearly state not all are 350kw but they seem to obfuscate how many are, it would be nice to know, they should have a map filter specifically for it: https://www.electrifyamerica.com/how-ev-charging-works&
787.
by SigmundA 5y ago
800v adds some complications, if the pack is 800v you need a boost converter to charge from 400v or the pack needs to dynamically reconfigure with contactors or something. On the Porsche Taycan which has an 800v battery you have to pay extr
788.
by SigmundA 5y ago
"The batteries alone weigh about 1,800 pounds, Ford officials told President Joe Biden during a tour of the Rouge Complex in Dearborn, Michigan, where the truck will be assembled." https://www.motortrend.com/news&#
789.
by SigmundA 5y ago
Diesel already increases cost and weight over gas and are pretty efficient which is why you don't see any hybrids. Electric motors don't compliment diesel like they do gas which can go Atkinson cycle allowing the gas motor to get
790.
by SigmundA 5y ago
Looks like roughly 130kwh battery for 230 miles and 180kwh for 300 miles. Large battery is 1800lbs, about twice the size and weight of a Model 3 battery. Towing range is always a problem with BEV's, to get good range they they usually
791.
by SigmundA 5y ago
This is the BMW tank I got those figures from which looks to be manufactured by Air Liquide [1]: "To stay a liquid, hydrogen must be cooled and maintained at cryogenic temperatures of, at warmest, −253 °C (20.1 K; −423.4 °F). When not
792.
by SigmundA 5y ago
Double walled high vacuum tanks that vent hydrogen gas if left unused for less than day and empty themselves after 10 days. Liquid hydrogen at -253c that is more energy intensive to make than high pressure. Not sure I see that being practic
793.
by SigmundA 5y ago
If however you have developed for mobile and specifically iOS you have a big head start: https://developer.apple.com/documentation/metal/gpu_features...
794.
by SigmundA 5y ago
They have been talking up the advantages of unified memory so my guess is they will stick with integrated, but I would imagine they will end up supporting AMD or Nvidia discrete to some degree.
795.
by SigmundA 5y ago
No I don't however I was much more skeptical of them in the past and also the math still lets me know Elon's timelines are lets say "optimistic", however the math also told me they where not completely full of it vs Niko
796.
by SigmundA 5y ago
Yep if you have a hydrogen pump nearby it will probably fill faster than a charger. Not sure if they need attendants like a propane fill. If you have a plug at home though thats much more convient at least to me when going to work.
797.
by SigmundA 5y ago
Tile based deferred renders help with memory bandwidth requirement (partly why UMA mobile GPUs and the M1 use it). The M1 has 16mb of cache coherent with CPU and GPU and then there is tile memory in each core.
798.
by SigmundA 5y ago
Drag isn't the only thing in play. They both are driving below highway speeds, one more so than the other, I wish there was some data for a Tesla at 40 mph vs 25 or 48 to compare more directly the difference. The Tesla will have betwee
799.
by SigmundA 5y ago
Yes I always like to do my own math it has sniffed out the BS many a time from the likes of Tesla, Nikola and so on. Not always right, but amazing how many times theirs is wrong especially if marketing something. You should alway try to und
800.
by SigmundA 5y ago
Lithium batteries still seem to have a way to go in energy density currently at around 250-300 wh/kg and going up year over year with a theoretical maximum (Sulfur cathode) of above 2500 wh/kg. At around 2000 wh/kg you are eq
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by SigmundA 5y ago
Really would like to know more about the GPU and Ram. At 128 gpu cores vs the 8 in the M1 you talking 16 times the potential GPU power which could put it up there near the top of discrete GPU's.
802.
by SigmundA 5y ago
Lithium self discharges at 1-2% per month, not an issue in most circumstances, not sure where it would be an issue, if it was just have a maintaining solar panel nearby.
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by SigmundA 5y ago
I agree also perhaps for grid scale storage
804.
by SigmundA 5y ago
Splitting water with electricity then recombining in the fuel cell back to electricity is extremely inefficient compared to just charging a battery with eletricity.
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by SigmundA 5y ago
Electrons are more energy dense than hydrogen unfortunately you need a heavy battery to store and use them properly. However hydrogen needs high pressure tanks and fuels cells to store and use it properly so there is basically no energy den
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by SigmundA 5y ago
Ok so go to the Model Y which is slightly heavier (Actually closer to the Nexo) and the worse aerodynamics than the Model 3 should have minimal effect if hypermiling at low speed, which also helps the Nexo vs Model 3. Model Y will blow the
807.
by SigmundA 5y ago
Or just charge a battery with the solar panels at much greater efficiency.
808.
by SigmundA 5y ago
This is at 66.9 km/h (40 mph) in order to greatly increase its range due to lower drag compared to normal highway speeds. As a comparison a Tesla Model 3 got 975km (606 miles) at 40 km/h (25 mph) [1]. I can't seem to find any
809.
by SigmundA 5y ago
First API's don't support it, can't pin memory (which is what a PBO does). Then oh well they are not taking advantage of it. Move the goal post much? TBDR came to prominence in UMA mobile architectures, it's a big part o
810.
by SigmundA 5y ago
I believe most of the benchmarks where Metal based in the Anand article, also PBO have been around for quiet a while in OpenGL: https://developer.apple.com/library/archive/documentation/Gr... Any back and for

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