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Topic: BITMAIN‘s Liquid Cooled Miner C1: It is not only cool, but it is cool - page 7. (Read 18311 times)

legendary
Activity: 1274
Merit: 1004
The RM1000 has 8 PCI-Es on 4 branches of 16AWG cabling. Its almost as good as 8 individual 18 AWG branches.
I'd disagree that a 16AWG cable with two plugs is almost as good as two separate 18AWG cables on a modular supply. Just looking at wire resistance it's close, the 16AWG will be 26% higher than two 18AWG and is obviously better than two plugs on a single 18AWG. On 17A of draw to a blade with 600mm of cable to the first connector, you'd be looking at 1.53W of loss and 90mV drop in just the cable with 16AWG vs 2.41W loss and 142mV drop with single 18AWG or 1.2W loss and 71mV drop with dual 18AWG. Not a huge difference, though one should keep in mind the contact resistance spec of the Minifit Jr connector can actually be as high as a 600mm run of 16AWG (7.9mOhms for the wire, while the contact spec is 10mOhm max initial and 30mOhm max after 30 cycles)

There's a couple disadvantages of running the two plugs on one cable though.
  • Two separate 18AWG cables will have almost twice the surface area to dissipate heat from vs one 16AWG. That's why you see ampacity in a cable go up only 56% when you move up three gauges even though the resistance halves. Flat cables help with this, of course.
  • Two plugs on a 16AWG cable pulls the entire cable current through the Minifit Jr on the PSU side. At 200W per cable this isn't terrible, but it's still a significant difference. At 17A per board that's 5.67A per pin vs half that with separate modular cables.
  • Worse fault tolerance. If you're running one cable and one pin/wire is compromised for whatever reason, you can then be pulling the full 17A through just two pins, which is over spec. If you're running two cables and one pin/wire gets compromised, you're now pulling the 17A over five pins which is still fine.

I would say two plugs on a 16AWG cable is closer to two plugs on an 18AWG than two separate 18AWG cables even if just the wire resistance seems to show they're comparable. A lot of these issues aren't a problem two plugs on a fixed 16AWG cable though. If you find yourself with a supply that has two fixed dual plug cables and four modular dual plug plug cables, use both plugs on the fixed cable and a single plug on each of the modular ones to make up your eight plugs.

Not that the RM1000 won't work, but unfortunately not all 1000W PSUs are 16AWG on the PCIe cables. For instance the otherwise excellent rated Cooler Master V1000 uses 18AWG on its four dual plug PCIe cables. Tongue In most cases even dual plugs on 18AWG won't cause an issue, but you're still more likely to melt a plug at the PSU with a modular dual plug cable than with separate cables.
sr. member
Activity: 318
Merit: 250
I may have to wait for the 2nd batch or at least until some people post feedback on the first few arrivals before I order.   Also is the liquid cooling kit link not working for everyone else?
legendary
Activity: 1092
Merit: 1000
i have to think about all these new developments.
legendary
Activity: 1666
Merit: 1185
dogiecoin.com
So the big question (and since it is early in the morning and I am skimming through these posts and I may have probably missed it........so all apologies) - what type of PSU should be used for the C1 and how much wattage should it have? I have seen all of the other details, but unlike Bitmain's other offerings, they aren't crystal clear on the C1's PSU requirements. Talk to me like I'm completely stupid and have just crawled out from under a rock

About 780w for the miner, 50W for the watercooling, requires 8 PCI-E. Still recommended to get a 1000W PSU though to get the best efficiency.
You might even want to look into one of the server breakout boards so you can get eight full cables. You probably need to get up into the 1300W+ range for ATX PSUs before you can find one with 8 individual cables, so with a smaller PSU you'd be looking at running with two plugs on a single cable. Depending on the cabling and ambient, that might be a little marginal.

The RM1000 has 8 PCI-Es on 4 branches of 16AWG cabling. Its almost as good as 8 individual 18 AWG branches.
legendary
Activity: 1274
Merit: 1004
So the big question (and since it is early in the morning and I am skimming through these posts and I may have probably missed it........so all apologies) - what type of PSU should be used for the C1 and how much wattage should it have? I have seen all of the other details, but unlike Bitmain's other offerings, they aren't crystal clear on the C1's PSU requirements. Talk to me like I'm completely stupid and have just crawled out from under a rock

About 780w for the miner, 50W for the watercooling, requires 8 PCI-E. Still recommended to get a 1000W PSU though to get the best efficiency.
You might even want to look into one of the server breakout boards so you can get eight full cables. You probably need to get up into the 1300W+ range for ATX PSUs before you can find one with 8 individual cables, so with a smaller PSU you'd be looking at running with two plugs on a single cable. Depending on the cabling and ambient, that might be a little marginal.
legendary
Activity: 1666
Merit: 1185
dogiecoin.com
So the big question (and since it is early in the morning and I am skimming through these posts and I may have probably missed it........so all apologies) - what type of PSU should be used for the C1 and how much wattage should it have? I have seen all of the other details, but unlike Bitmain's other offerings, they aren't crystal clear on the C1's PSU requirements. Talk to me like I'm completely stupid and have just crawled out from under a rock

About 780w for the miner, 50W for the watercooling, requires 8 PCI-E. Still recommended to get a 1000W PSU though to get the best efficiency.
member
Activity: 66
Merit: 10
Mining til I puke
So the big question (and since it is early in the morning and I am skimming through these posts and I may have probably missed it........so all apologies) - what type of PSU should be used for the C1 and how much wattage should it have? I have seen all of the other details, but unlike Bitmain's other offerings, they aren't crystal clear on the C1's PSU requirements. Talk to me like I'm completely stupid and have just crawled out from under a rock
member
Activity: 61
Merit: 10
Do think a 850w gold power supply rated at 70A on 12v will be able to handle the C1? I know it will run at 100% capacity but I have  no use for it otherwise.

cutting it REALLY close - good chance you'll have to underclock in order to run stable, especially if the coolant pump draws an extra ~20w. IMO get a 1000W PSU and youll be fine, and your efficiency will be a bit better (most gold PSUs are ~91% efficient at 80% load, but only ~85% efficient at 100% load)

What are these chips clocked with to begin with?


Can anyone confirm what the frequency on these chips are?

I'd like to know if there is headroom for overclocking. Trying to figure out if getting 1100gh/s or 1200gh/s will end up eating 1000w+


I have asked a few times in the past  Huh
That's because no one has one. They are the same as an S3 though, so if they're running at 1TH/s they're probably clocked at 250MHz.



This was my concern Sad I wonder if the 800watts is really 880
newbie
Activity: 25
Merit: 0
Wow nice - Bitmain has a "Pay with USD" option now upon checkout

I received
Quote
Payment in US dollars is not available for ' C1, ANTMINER S3+ -B11 In Stock, ANTMINER U3 '
.

Appears S4 USD payment only at this moment.
legendary
Activity: 1274
Merit: 1004
Do think a 850w gold power supply rated at 70A on 12v will be able to handle the C1? I know it will run at 100% capacity but I have  no use for it otherwise.

cutting it REALLY close - good chance you'll have to underclock in order to run stable, especially if the coolant pump draws an extra ~20w. IMO get a 1000W PSU and youll be fine, and your efficiency will be a bit better (most gold PSUs are ~91% efficient at 80% load, but only ~85% efficient at 100% load)

What are these chips clocked with to begin with?


Can anyone confirm what the frequency on these chips are?

I'd like to know if there is headroom for overclocking. Trying to figure out if getting 1100gh/s or 1200gh/s will end up eating 1000w+


I have asked a few times in the past  Huh
That's because no one has one. They are the same as an S3 though, so if they're running at 1TH/s they're probably clocked at 250MHz.
member
Activity: 61
Merit: 10
Do think a 850w gold power supply rated at 70A on 12v will be able to handle the C1? I know it will run at 100% capacity but I have  no use for it otherwise.

cutting it REALLY close - good chance you'll have to underclock in order to run stable, especially if the coolant pump draws an extra ~20w. IMO get a 1000W PSU and youll be fine, and your efficiency will be a bit better (most gold PSUs are ~91% efficient at 80% load, but only ~85% efficient at 100% load)

What are these chips clocked with to begin with?


Can anyone confirm what the frequency on these chips are?

I'd like to know if there is headroom for overclocking. Trying to figure out if getting 1100gh/s or 1200gh/s will end up eating 1000w+


I have asked a few times in the past  Huh
sr. member
Activity: 318
Merit: 250
Wow nice - Bitmain has a "Pay with USD" option now upon checkout
legendary
Activity: 1666
Merit: 1185
dogiecoin.com

Specifications:
* Voltage: DC 12V input, 70A recommended, no PSU

I'm confused ... is not necessary a PSU to start mining or is not included in price?


No PSU included
sr. member
Activity: 406
Merit: 250

Specifications:
* Voltage: DC 12V input, 70A recommended, no PSU

I'm confused ... is not necessary a PSU to start mining or is not included in price?
legendary
Activity: 2128
Merit: 1005
ASIC Wannabe
No need for experimenting noob,

Fluid dynamic dictates since all C1 are equal in restriction, all of them will have equal flowrate.... gee  Roll Eyes

you assume that all three C1 waterblocks are equal. Theres a high chance that there could be slight machining diferences, or slight barbs from the machining, that could cause slightly higher resistance in some units. Its not particularly likely, but it is still possible. (easy way to adjust for this if it was an issue is to put a small vavle on each loop of the coolant to compensate any flow differences
legendary
Activity: 2338
Merit: 1124
I think it will not be a problem to run three C1s with one strong pump... will give it a try :-)

With the super cheap kits being sold I'm not sure there is a reason to. Removes all your redundancy with no benefit.

I agree. However, I still have a lot of old stuff here in my basement, so I'll only have to buy some fittings and new tubes. Especially with a 9-fan-radiator and a 1800l/h-pump, I guess it should be possible. In the worst case, one miner will be super-cool while the middle will be warm and the third one overheated...


As i said many pages ago, RUN THEM PARALLEL, god damn you noobs (also since the block channels are quite small 6mm, make a cheap manifold - 1/2" to 3 x 6mm tubing)

 



Of course parallel and not serial. The available distributor I have leads from 1/4" to 3x10mm. Although the distance between the three exits is only some millimeters, I'm not sure if this will affect the flow to the third massively. It will take a bit of experimenting.

No need for experimenting noob,

Fluid dynamic dictates since all C1 are equal in restriction, all of them will have equal flowrate.... gee  Roll Eyes

Great news :-) So I can wait for my sockwarmers to come.
hero member
Activity: 658
Merit: 500
I think it will not be a problem to run three C1s with one strong pump... will give it a try :-)

With the super cheap kits being sold I'm not sure there is a reason to. Removes all your redundancy with no benefit.

I agree. However, I still have a lot of old stuff here in my basement, so I'll only have to buy some fittings and new tubes. Especially with a 9-fan-radiator and a 1800l/h-pump, I guess it should be possible. In the worst case, one miner will be super-cool while the middle will be warm and the third one overheated...


As i said many pages ago, RUN THEM PARALLEL, god damn you noobs (also since the block channels are quite small 6mm, make a cheap manifold - 1/2" to 3 x 6mm tubing)

 

Of course parallel and not serial. The available distributor I have leads from 1/4" to 3x10mm. Although the distance between the three exits is only some millimeters, I'm not sure if this will affect the flow to the third massively. It will take a bit of experimenting.

No need for experimenting noob,

Fluid dynamic dictates since all C1 are equal in restriction, all of them will have equal flowrate.... gee  Roll Eyes
legendary
Activity: 2338
Merit: 1124
I think it will not be a problem to run three C1s with one strong pump... will give it a try :-)

With the super cheap kits being sold I'm not sure there is a reason to. Removes all your redundancy with no benefit.

I agree. However, I still have a lot of old stuff here in my basement, so I'll only have to buy some fittings and new tubes. Especially with a 9-fan-radiator and a 1800l/h-pump, I guess it should be possible. In the worst case, one miner will be super-cool while the middle will be warm and the third one overheated...

Heh, we have a company we contract for that has a couple Techniwell TW700s sitting idle. I wonder how many one of those could run? Smiley

"To the moon" would get a totally new meaning....
legendary
Activity: 2338
Merit: 1124
I think it will not be a problem to run three C1s with one strong pump... will give it a try :-)

With the super cheap kits being sold I'm not sure there is a reason to. Removes all your redundancy with no benefit.

I agree. However, I still have a lot of old stuff here in my basement, so I'll only have to buy some fittings and new tubes. Especially with a 9-fan-radiator and a 1800l/h-pump, I guess it should be possible. In the worst case, one miner will be super-cool while the middle will be warm and the third one overheated...


As i said many pages ago, RUN THEM PARALLEL, god damn you noobs (also since the block channels are quite small 6mm, make a cheap manifold - 1/2" to 3 x 6mm tubing)

 

Of course parallel and not serial. The available distributor I have leads from 1/4" to 3x10mm. Although the distance between the three exits is only some millimeters, I'm not sure if this will affect the flow to the third massively. It will take a bit of experimenting.
ZiG
sr. member
Activity: 406
Merit: 250
I think it will not be a problem to run three C1s with one strong pump... will give it a try :-)

With the super cheap kits being sold I'm not sure there is a reason to. Removes all your redundancy with no benefit.

I agree. However, I still have a lot of old stuff here in my basement, so I'll only have to buy some fittings and new tubes. Especially with a 9-fan-radiator and a 1800l/h-pump, I guess it should be possible. In the worst case, one miner will be super-cool while the middle will be warm and the third one overheated...

Heh, we have a company we contract for that has a couple Techniwell TW700s sitting idle. I wonder how many one of those could run? Smiley

Are you kidding... Grin

ZiG
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