HashFast announces specs for new ASIC: 400GH/s - page 509.

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Quote from: DeathAndTaxes on October 20, 2013, 04:56:47 PM

Quote from: Puppet on October 20, 2013, 03:05:30 PM

Its also pretty darn stupid to pull air in from the back of the rack where everything else is dumping its heat. THe PSU would be breathing in warm air, heat it further, then dump that inside the cabinet where it cant get out.

The PSU (like evey PSU made) exhausts out the "back". If installed as shown in HF model it would intake from the outside and exhaust out the back. If you flip the PSU 180 it would instake from the inside and still exhaust out the back.

I got it -- you didn't read the entire thread (don't blame you).
Cypherdoc claimed that the power supply *exhausts* where normal PSs intake air. Completely backwards. Leading us to suspect that he was pulling things out of ... Angry

Edit: As far as PSs being fine with sucking on hot air, i'm not so sure. Making them do it just because people were too lazy to think about proper air management is absurd.

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Quote from: DeathAndTaxes on October 20, 2013, 04:56:47 PM

The PSU (like evey PSU made) exhausts out the "back". If installed as shown in HF model it would intake from the outside and exhaust out the back.

Thats not what whateverhisname claimed HF told him. But since it makes completely no sense, I agree and he probably got it wrong.

As for the cooling 50-70W inside a PSU; Im not disputing that the PSU will work fine and not have trouble with slightly elevated air temperatures, but your analogy with the lightbulb is flawed. First of all, how hot does a 60W lightbulb get under normal circumstances ? googling suggests ~110C above ambient. Inside your PSU enclosure without active cooling it would likely heat up to 160-170C, hot enough to start melting solder.

Secondly, 60W also happens to be the power of my favorite soldering iron, and its not even pulling 60W constantly. As you may have guessed, surface area matters.

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Quote from: DeathAndTaxes on October 20, 2013, 04:52:00 PM

Quote from: crumbs on October 20, 2013, 04:00:21 PM

What's funny about the whole layout is the radiators/fans are at the front of the case, dumping the hot air *inside* the case, making the PSs suck in hot exhaust when the PSs are flipped 180.

Every single rackmount server pulls in warm case air to cool the PSU. PSU these days are highly efficient they don't need ultra cold air or high RPM fans. A low airflow of hot (90F+) air is well within design spec. It is a non-issue. At 600W load and 90% efficiency you are talking 54W of heat. It is more expensive (due to the amount of metal in larger heat sink) but they make passive power supplies because 54W in a space the size of a power supply is nothing it is less than a lightbulb in a space 10x larger.

Well no. These servers are not preheating the air at the intake & toasting the case with it. The heat is generated halfway down the case, at the CPUs, VRMs, etc., etc. The air is also *managed*, it's routed -- not just haphazardly splashed all over the place. The power supplies don't suck preheated air, as they would in this design. Here's a random gif i just dug up -- certainly not the best-planned case, but an example of what i mean. Notice the PS getting cool, fresh air

Edit: Just looked closer at the pic i chose -- dual P3s Cheesy

Crankin'!

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Gerald Davis

Quote from: Puppet on October 20, 2013, 03:05:30 PM

Its also pretty darn stupid to pull air in from the back of the rack where everything else is dumping its heat. THe PSU would be breathing in warm air, heat it further, then dump that inside the cabinet where it cant get out.

The PSU (like evey PSU made) exhausts out the "back". If installed as shown in HF model it would intake from the outside and exhaust out the back. If you flip the PSU 180 it would instake from the inside and still exhaust out the back.

DeathAndTaxes

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Gerald Davis

Quote from: crumbs on October 20, 2013, 04:00:21 PM

What's funny about the whole layout is the radiators/fans are at the front of the case, dumping the hot air *inside* the case, making the PSs suck in hot exhaust when the PSs are flipped 180.

Every single rackmount server pulls in warm case air to cool the PSU. PSU these days are highly efficient they don't need ultra cold air or high RPM fans. A low airflow of hot (90F+) air is well within design spec. It is a non-issue. At 600W load and 90% efficiency you are talking 54W of heat. It is more expensive (due to the amount of metal in larger heat sink) but they make passive power supplies because 54W in a space the size of a power supply is nothing it is less than a lightbulb in a space 10x larger.

DeathAndTaxes

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Gerald Davis

The power supply is a non issue.

Outside of datacenter. Use it as shown in the photo. Draw in cooler outside air, exhaust out the back.

Inside datacenter (w/ restricted side access). Flip PSU 180 degrees. Draw in warmer case air, exhaust out the back.

As far as PSU can't handle the heat load. It will handle it just fine. MOST PSU draw in warm case air. Take a look at any rackmount server PSU. They ALL draw in heated case air. In a datacenter the power is likely 208V. At 208V/240V PSU tend to be 1% to 2% higher efficiency. At 90% efficiency you are looking at 50W heatload. It is like the ultra difficult task of cooling a lightbulb in 90F air. You know like what happens every single day outside in the summer.

SeaSonics are built like a rock. Open one up or look at reviews which show internals. Massive heat sinks, giant transformers, oversized Japanese caps. I ran a farm of GPU in a 90 deg garage for better part of two years using SeaSonics. Not a single one died, not a single one underperformed. We are talking 1200W units, 90F ambient, dusty conditions, 95%+ load. They just work.

cedivad

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Quote from: DPoS on October 20, 2013, 04:37:41 PM

no chips...no case...no design...no refunds...

But the best pr ever.

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no chips...no case...no design...no refunds...

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Quote from: Micky25 on October 20, 2013, 03:50:49 PM

Quote from: cedivad on October 20, 2013, 03:14:45 PM

Exhausts on the side doesn't make any sense in any way you look at it. Datacenter racks are death easy: cold air on the front, warm on the back; there is no side intake or bs like that, there are other servers on the side.
Just flip the psu 180 degrees and you have a working design.

The 180 degree flip would probably be the better way of doing it...

What's funny about the whole layout is the radiators/fans are at the front of the case, dumping the hot air *inside* the case, making the PSs suck in hot exhaust when the PSs are flipped 180.

The whole thing seems like 0 thought went into design.

Edit: Nitpicking now, but the VRMs put out a decent amount of heat, too. With air cooling, there's air spilling from the heatsink -- enough to cool them. With waterblocks & no airflow planning, combined with the case being cooked by hot exhaust -- possible/unnecessary problems.

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Quote from: cedivad on October 20, 2013, 03:14:45 PM

Exhausts on the side doesn't make any sense in any way you look at it. Datacenter racks are death easy: cold air on the front, warm on the back; there is no side intake or bs like that, there are other servers on the side.
Just flip the psu 180 degrees and you have a working design.

The 180 degree flip would probably be the better way of doing it...

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Quote from: Micky25 on October 20, 2013, 03:23:11 PM

Servers do that as well but put it back there.

Id like to see a rackmountable server that pulls in air from the back. Maybe it exists, but Ive never seen it, and I certainly dont believe it would be for a high power density design.

Micky25

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Quote from: Puppet on October 20, 2013, 03:05:30 PM

Its also pretty darn stupid to pull air in from the back of the rack where everything else is dumping its heat.

Servers do that as well but put it back there.

Quote from: cedivad on October 20, 2013, 03:14:45 PM

I don't care about the PSUs. I care about the fact that they don't know how a PSU and a rack works. Who have i paid? Elementary school boys?

Maybe they should call it an innovation and make a press release Cheesy

But of course you guys are right.

cedivad

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Quote from: Micky25 on October 20, 2013, 02:41:00 PM

Quote from: cedivad on October 20, 2013, 11:02:27 AM

Exhausts on the side doesn't make any sense in any way you look at it. Datacenter racks are death easy: cold air on the front, warm on the back; there is no side intake or bs like that, there are other servers on the side.
Just flip the psu 180 degrees and you have a working design.

Admittedly a rather maverick design idea of hashfast, but probably no big problem. The PSUs only have to exhaust their own heat, which should be negligible.

I don't care about the PSUs. I care about the fact that they don't know how a PSU and a rack works. Who have i paid? Elementary school boys?

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Quote from: pwnyboy on October 20, 2013, 10:37:41 AM

Quote from: perezoso on October 20, 2013, 09:41:04 AM

Hashfast never finalized a case design

You're acting like that's somehow an asset. It's not.

Nah, not an asset.

What I'm saying is that people shouldn't have made presumptions about the location of components in the absence of a final design.

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Quote from: Micky25 on October 20, 2013, 02:41:00 PM

Admittedly a rather maverick design idea of hashfast, but probably no big problem. The PSUs only have to exhaust their own heat, which should be negligible.

Not quite negligible. The PSU powering 2 boards would have to provide 520W. With an efficiency of 87% (http://www.hardwaresecrets.com/article/Seasonic-X-Series-850-W-Power-Supply-Review/1169/7) that still means its burning up ~70W that is has to vent through holes that may be partially blocked.

Its also pretty darn stupid to pull air in from the back of the rack where everything else is dumping its heat. THe PSU would be breathing in warm air, heat it further, then dump that inside the cabinet where it cant get out. May not be a problem if you have one sierra per rack, but try to fill a rack with it and see how well it works if 1500W from the PSU and perhaps many times that from sucking in warm exhaust air, is heating the sides of cabinet on either side.

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So are we going to get some guidance on a more accurate ship date from HashFast seems like today, Oct. 20th, was the original best estimate ship date.

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Quote from: crumbs on October 20, 2013, 09:55:16 AM

Lol, you <3 your BFL pre-order so much, you didn't want to break the losing streak & signed up for moar surprise butsecs. Cheesy

Actually, I made money with BFL. Wasn't a lot of equipment, but I mined it a couple weeks and sold on ebay. About 250% profit. You call that a "butsec"?

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Quote from: cedivad on October 20, 2013, 11:02:27 AM

Exhausts on the side doesn't make any sense in any way you look at it. Datacenter racks are death easy: cold air on the front, warm on the back; there is no side intake or bs like that, there are other servers on the side.
Just flip the psu 180 degrees and you have a working design.

Admittedly a rather maverick design idea of hashfast, but probably no big problem. The PSUs only have to exhaust their own heat, which should be negligible.

DigginDeep

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Quote from: perezoso on October 20, 2013, 09:41:04 AM

Deep breath, people. Relax.

Hashfast never finalized a case design and hasn't missed any dates yet.

There are strong indications are that they will hit their end of the month promise, or come very very close.

Don't start beating the crap out of them before they've had a chance to deliver, it hurts your credibility if you need to seek compensation later, as you come across as being the kind of person that will bitch and moan no matter what happens.

Save the hysterics and vitriol for when they really deserve it. But right now, we're still 10 days from the end of their projected shipping window.

And yes, I was a BFL customer, and yes, I am a batch one customer.

LMAO i love how ignorant people here are...... Really? 10 days and all they have to show is some computer renderings? I bet you believe in santa claus and the Easter bunny to.

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Quote from: perezoso on October 20, 2013, 09:41:04 AM

And yes, I was a BFL customer, and yes, I am a batch one customer.

Stockholm Syndrome?

Topic: HashFast announces specs for new ASIC: 400GH/s - page 509. (Read 880479 times)