Wednesday, September 12, 2018

iPhone prices

I guess all those rumors that Apple was going to cut prices turned out not to be true.  Anybody want to spend $1300 on a smartphone?

https://youtu.be/vjxvrG_t-Rs

Apple's new ad is cool.


That's what it looks like when you spend 5 billion dollars on a building.
Every time I post an ad to Craigslist, I immediately get text messages from scammers. It is almost instantaneous, which means that they are using bots.

However, their latest pitch is rather clever. They claim that they want to verify that I am not a scammer, so therefore they are going to send me a verification code, which I should send back to them. This makes very little sense if you think about it, but what they are trying to do is connect to my email account and use the the forgot password feature to send a passcode to my phone. Then if I send them the code they get access to my email. How this does them any good I'm not entirely sure about, but I suppose they could use the account to spam or propagate other scams.

Just based on the craigslist ad, I'm not sure how they know what my email account is.  

Wednesday, August 29, 2018

Battery advancement

Chemists have successfully resolved two of the most challenging issues surrounding lithium-oxygen batteries, and in the process created a working battery with near 100 per cent coulombic efficiency. The new work demonstrates that four-electron conversion for lithium-oxygen electrochemistry is highly reversible. The team is the first to achieve four-electron conversion, which doubles the electron storage of lithium-oxygen, also known as lithium-air, batteries


Thursday, July 5, 2018

Wednesday, June 27, 2018

Fwd: Using wireless signals to set humans through walls

MIT has given a computer x-ray vision, but it didn't need x-rays to do it. The system, known as RF-Pose, uses a neural network and radio signals to track people through an environment and generate wireframe models in real time. It doesn't even need to have a direct line of sight to know how someone is walking, sitting, or waving their arms on the other side of a wall.


APPLE IPHONE 2018'S CHIPS HIT PRODUCTION LINES, TO BE BUILT ON 7 NM PROCESS BY TSMC

The A11 processor on the iPhone 8/10 is more powerful than my desktop computer, but Apple isn't stopping there.


Saturday, June 23, 2018

Comparing AMD CPU's (corrected)

Much attention has been made in the press over the new AMD Threadripper CPU.  With 16 cores and 32 threads, this thing is a monster.  But it debuted at $1,000 just for the CPU, and I saw that some computer builds were costing like $4,000.  It seems that buying the most expensive CPU also means that the parts to make it work are also just as pricey.

But if we look at its benchmark, https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+Threadripper+1950X&id=3058, compared with the next lower chip, which has half as many cores and less than half the cost, https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+7+2700X&id=3238, there is not enough difference between them that would justify the extra cost.

When I bought my Core-i7 iMac in 2010 it was close to top of the line, https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-860+%40+2.80GHz&id=6, but now it is more like average at best.  After eight years I am wanting more power.  I am also wanting more graphics power, because what little graphics power that came with my late 2009 iMac is pretty terrible, and these all-in-one computers are not upgradable.

If someone wants to do gaming on budget, there are videos on youtube telling you how to build a gaming PC for around $500, using the Ryzen 3 2200G https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+3+2200G&id=3186.  This and the 2400G have gotten much attention because they are 'APU's', that have some limited graphics capability built into the processor.  Because of the low cost of the 2200G, it has gotten the most attention, but the 2400G seems like a big step up at just $70 more in cost.   https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+5+2400G&id=3183   Since the processor is only a small part of the overall cost, it seems to me like it would be worth it to spend marginally more to get a more powerful system.

Likewise AMD has some older slightly slower processors that are lower in cost, but considered a good value.  However, I don't see the value in settling for slightly less power to just save a few bucks on the processor.

If you want more power than what the 2200G and 2400g can deliver, then you have to give up the built in graphics and buy a seperate video card, for which you can expect to spend $300 to $500, or more, just for the card.  That is the problem.  People are claiming that graphics cards are coming down in price, but we are not really seeing it yet.  Graphics cards have been very expensive because people have been buying them for cryptocurrency mining.

So I would like to build a Ryzen APU based computer for relatively low cost.   My current computer occasionally shuts down for no apparent reason, but after I cleaned the dusty vents it seems to be doing better.  I figure that eventually I will have to repair it or replace it.  I would rather replace it.

According to AMD, they are coming out with new APU's in both 2019 and 2020.  Newer probably means more power, which is what I want.  I should try to hold out until at least 2019 to see what they come out with.

I want to do much more with a computer than just play games, but if that is all you want then the Microsoft XBox One X is graphically pretty powerful for its $500 price tag.  An equivalent computer might cost $1,000.  The XBOX One X also uses a custom AMD APU, but you can't buy that processor;  It is only available on the XBOX One X.

--

Comparing AMD CPU's

Much attention has been made in the press over the new AMD Threadripper CPU.  With 16 cores and 32 threads, this thing is a monster.  But it debuted at $1,000 just for the CPU, and I saw that some computer builds were costing like $4,000 to $5,000.  It seems that buying the most expensive CPU also means that the parts to make it work are also just as pricey.

But if we look at its benchmark, https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+Threadripper+1950X&id=3058, compared with the next lower chip, which has half as many cores and costs half as much or less, https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+7+2700X&id=3238, there is not enough difference between them that would justify the extra cost.

When I bought my Core-i7 iMac in 2010 it was pretty much top of the line, https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-860+%40+2.80GHz&id=6, but now it is more like aveage at best.  After eight years I am wanting more power.  I am also wanting more graphics power, because what little graphics power that came with my late 2009 iMac is pretty terrible, and these all-in-one computers are not upgradable.

If someone wants gaming on budget, there are videos on youtube telling you have to build a gaming PC for around $500, using the Ryzen 3 2200G https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+3+2200G&id=3186.  This and the 2400G have gotten much attention because they are 'APU's', that have some limited graphics capability built into the processor.  Because of the low cost of the 2200G, it has gotten the most attention, but the 2400G seems like a big step up at just $70 more in cost.   https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+5+2400G&id=3183   Since the processor is only a small part of the overall cost, it seems to me like it would be worth it to spend marginally more to get a more powerful system.

Likewise AMD has some older slightly slower processors that are lower in cost but considered a good value.  However, I don't see the value in settling for slightly less power to just save a few bucks on the processor.

If you want more power than what the 2200G and 2400g can deliver, then you have to give up the built in graphics and buy a seperate video card, for which you can expect to spend $300 to $500 just for the card.  That is the problem.  People are claiming that graphics cards are coming down in prices, but we are not really seeing it yet.  Graphics cards have been very expensive because people have been buying them for cryptocurrency mining.

I would like to build a Ryzen APU computer for relatively low cost.   My current computer occasionally shut downs for no apparent reason, but after I cleaned the dusty vents it seems to be doing better.  I figure that eventually I will have to repair it or replace it.  I would rather replace it.

According to AMD, they are coming out with new APU's in both 2019 and 2020.  Newer probably means more power, which is what I want.  I should try to hold out until at least 2019 to see what they come out with.

I want to do much more with a computer than just play games, but if that is all you want then the Microsoft XBox One X is graphically pretty powerful for its $500 price tag.  An equivalent computer might cost $800.  The XBOX One X also uses an AMD APU, but you can't buy that processor.  It is only available on the XBOX One X.

--

It is unbelievable to me how much processing power and storage these guys use.

Monday, June 18, 2018