qupada

joined 1 year ago
[–] qupada@kbin.social 5 points 5 months ago

It is a good question.

Where I live, electricity costs around $0.28/kWh, but generation is typically >85% renewable (predominantly hydroelectric).

My heat pump (4.7 COP when heating) would cost $0.06 to run for every 1kWh of heat it produces, with only 0.03kWh of that electricity coming from fossil fuel sources.

Gas - which I don't have at my house - would have pricing in the neighbourhood of $0.15/kWh. Even at 95% efficiency getting 1kWh of heat from gas would cost $0.16, using 1.05kWh of gas.

35x the fossil fuel usage and 2.5x the price, for the same quantity of heat. Some luck of living in a moderate climate where an air-source heat pump almost never loses efficiency, to be fair.

[–] qupada@kbin.social 3 points 5 months ago (1 children)

Probably best to look at it as a competitor to a Xeon D system, rather than any full-size server.

We use a few of the Dell XR4000 at work (https://www.dell.com/en-us/shop/ipovw/poweredge-xr4510c), as they're small, low power, and able to be mounted in a 2-post comms rack.

Our CPU of choice there is the Xeon D-2776NT (https://www.intel.com/content/www/us/en/products/sku/226239/intel-xeon-d2776nt-processor-25m-cache-up-to-3-20-ghz/specifications.html), which features 16 cores @ 2.1GHz, 32 PCIe 4.0 lanes, and is rated 117W.

The ostensibly top of this range 4584PX, also with 16 cores but at double the clock speed, 28 PCIe 5.0 lanes, and 120W seems like it would be a perfectly fine drop-in replacement for that.

(I will note there is one significant difference that the Xeon does come with a built-in NIC; in this case the 4-port 25Gb "E823-C", saving you space and PCIe lanes in your system)

As more PCIe 5.0 expansion options land, I'd expect the need for large quantities of PCIe to diminish somewhat. A 100Gb NIC would only require a x4 port, and even a x8 HBA could push more than 15GB/s. Indeed, if you compare the total possible PCIe throughput of those CPUs, 32x 4.0 is ~63GB/s, while 28x 5.0 gets you ~110GB/s.

Unfortunately, we're now at the mercy of what server designs these wind up in. I have to say though, I fully expect it is going to be smaller designs marketed as "edge" compute, like that Dell system.

[–] qupada@kbin.social 2 points 6 months ago

Unfortunately what's shipping today seems it would offer maybe half that.

For the batteries that were announced this past week, a larger-than-refrigerator-sized cabinet held a capacity of around 15kWh.

Around half the energy density by mass of Lithium batteries, and in the order of a sixth of the density by volume.

Now if only we could come up with a system where your car could be charged while stopped at traffic lights, we might be onto a winner (:

Considering however that the price of sodium is around 1-2% that of lithium, I expect we will see significant R&D and those numbers quickly start to improve.

[–] qupada@kbin.social 24 points 6 months ago (4 children)

I genuinely hope you enjoy all the negative reviews you're about to receive, Sony.

[–] qupada@kbin.social 24 points 6 months ago (7 children)

I've been seeing a lot about Sodium-ion just in the past week.

While they seem to have a huge advantage in being able to charge and discharge at some fairly eye-watering rates, the miserable energy density would seem to limit them to stationary applications, at least for now.

Perfect for backup power, load shifting, and other power-grid-tied applications though.

[–] qupada@kbin.social 21 points 6 months ago* (last edited 6 months ago) (1 children)

I was about to say. A third of a cup is more than the ENTIRE VOLUME OF DRESSING I'd consider putting in a salad... that would serve four people.

Maybe a teaspoon of sugar to balance the acidic flavours in the dressing. Maybe.

Looking at that recipe, it reads like "quick pickles" which are normally made with a hot mixture of white vinegar and sugar (and admittedly quite a lot of sugar), but in those the critical step is you drain the pickled vegetables before serving, so the actual amount of sugar retained by the food is still relatively low. No mention of draining before serving here though, so perhaps it is just artificially-sweetened cucumber and vinegar soup? Blergh.

[–] qupada@kbin.social 4 points 7 months ago

Came to post the same. Seems like the most awkward possible way to phrase that.

Your "Disks not included" suggestion, or heck, just "empty" would surely be better.

[–] qupada@kbin.social 11 points 7 months ago* (last edited 7 months ago)

Interestingly, looking at Gentoo's package, they have both the github and tukaani.org URLs listed:

https://github.com/gentoo/gentoo/blob/master/app-arch/xz-utils/xz-utils-5.6.1.ebuild#L28

From what I understand, those wouldn't be the same tarball, and might have thrown an error.

[–] qupada@kbin.social 11 points 7 months ago

I too have an oddly specific one of these, which is tartare sauce.

I actively dislike all three of mayonnaise, gherkins, and capers. Mix 'em together though? Brilliant.

[–] qupada@kbin.social 4 points 7 months ago

Sharp also make great commerical-grade printers that are 100% Linux compatible, we're using these at work: http://global.sharp/products/copier/products/bp_70c65/index.html

They don't really make anything small enough to be a "home" model, this looks like their smallest printer: https://global.sharp/products/copier/products/mx_c358f/index.html (and that's around $1000, if you could even find someone to sell you one).

[–] qupada@kbin.social 2 points 8 months ago

Without giving Amazon too much of the benefit of the doubt here, I've noticed they love to offer you "coupons", generally with a midnight expiry.

I expect it's 100% a tactic to get you to commit to something you've looked at a couple of times but might be on the fence about buying.

I get the same as OP's logged-out price (nothing hidden) while logged in, perhaps if they are offering a coupon it would take it below the minimum advertised price.

Definitely stupid, but it's the only way I can see of arriving at this situation.

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