How i can undrervolt Ant minter s1 ???????????? - page 2.

philipma1957

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Quote from: Littleshop on March 15, 2014, 08:05:28 PM

Quote from: noise23 on March 15, 2014, 08:03:04 PM

Quote from: crazyates on March 15, 2014, 02:29:58 PM

Wait, I thought the BM1380 was for the S2? Do the S1 and the S2 use the same chip? Why did I think they were using different chips? I've been sick this week, and a little out of it, so my apologies for any confusion.

Yep the S1 and the S2 use the same chip.

Quote from: crazyates on March 15, 2014, 05:23:37 PM

Lets say we went with the 0.75V @ 205MHz, and OC'd it to 245MHz. Each S1 would be making 125GH/s, and pulling 82W at the chip). That means @20% inefficiencies, and adding the fixed costs = ~130W. 8 ants would be making 1TH/s while only using 1040W (from the PSU, which means 1140W from the wall).

Sounds great

We need to find out somehow where that resistor is and what resistance it should be changed to to get 0.75V!

Due to the design of the unit I would imagine you would need to change eight SMT resistors. A bit of a pain but interesting.

yeah my eyes are too old but it is doable.

maybe 100gh at 100 watts could be done.

Littleshop

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Quote from: noise23 on March 15, 2014, 08:03:04 PM

Quote from: crazyates on March 15, 2014, 02:29:58 PM

Wait, I thought the BM1380 was for the S2? Do the S1 and the S2 use the same chip? Why did I think they were using different chips? I've been sick this week, and a little out of it, so my apologies for any confusion.

Yep the S1 and the S2 use the same chip.

Quote from: crazyates on March 15, 2014, 05:23:37 PM

Lets say we went with the 0.75V @ 205MHz, and OC'd it to 245MHz. Each S1 would be making 125GH/s, and pulling 82W at the chip). That means @20% inefficiencies, and adding the fixed costs = ~130W. 8 ants would be making 1TH/s while only using 1040W (from the PSU, which means 1140W from the wall).

Sounds great

We need to find out somehow where that resistor is and what resistance it should be changed to to get 0.75V!

Due to the design of the unit I would imagine you would need to change eight SMT resistors. A bit of a pain but interesting.

noise23

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Quote from: crazyates on March 15, 2014, 02:29:58 PM

Wait, I thought the BM1380 was for the S2? Do the S1 and the S2 use the same chip? Why did I think they were using different chips? I've been sick this week, and a little out of it, so my apologies for any confusion.

Yep the S1 and the S2 use the same chip.

Quote from: crazyates on March 15, 2014, 05:23:37 PM

Lets say we went with the 0.75V @ 205MHz, and OC'd it to 245MHz. Each S1 would be making 125GH/s, and pulling 82W at the chip). That means @20% inefficiencies, and adding the fixed costs = ~130W. 8 ants would be making 1TH/s while only using 1040W (from the PSU, which means 1140W from the wall).

Sounds great

We need to find out somehow where that resistor is and what resistance it should be changed to to get 0.75V!

jelin1984

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These how I can do at my antminter

320 1.00V 160 180.5 265

crazyates

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jelin1984

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150gh how much 200watt or not?

Syke

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Quote from: jelin1984 on March 15, 2014, 04:20:19 PM

any details how i can exactly do these???

Underclock to 160GH/s, and pull ~200W each.

160 GH/s should draw 320 watts.

The file to edit is "/etc/config/asic-freq". ssh to the unit and edit that file. You can search the forum for more details.

jelin1984

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any details how i can exactly do these???

Underclock to 160GH/s, and pull ~200W each.

Syke

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Quote from: kendog77 on March 15, 2014, 03:10:21 PM

Has anyone tried just reducing the clock speed and measuring watts used at the wall?

Since overclocking increases power consumption, it stands to reason that underclocking would reduce power consumption, wouldn't it?

Yes. Over/underclocking gives a roughly linear result. If 180 GH/s draws 360 watts, then overclocking to 200 GH/s draws 400 watts, and underclocking to 150 GH/s draws 300 watts. These are just estimates, because things like PSU efficiency changes depending on power draw, and other little details.

kendog77

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Quote from: crazyates on March 15, 2014, 03:16:38 PM

Quote from: kendog77 on March 15, 2014, 03:10:21 PM

Has anyone tried just reducing the clock speed and measuring watts used at the wall?

Since overclocking increases power consumption, it stands to reason that underclocking would reduce power consumption, wouldn't it?

Undervolting is aimed to reduce power consumption while retaining the same hashrate. This doesn't do that.

If Bitmain can't even do that with the S2, I don't see how users would be able to do that with the S1. I believe Bitmain is simply using more underclocked 55 nm chips to obtain 1W/GH with the S2.

crazyates

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Quote from: kendog77 on March 15, 2014, 03:10:21 PM

Has anyone tried just reducing the clock speed and measuring watts used at the wall?

Since overclocking increases power consumption, it stands to reason that underclocking would reduce power consumption, wouldn't it?

Undervolting is aimed to reduce power consumption while retaining the same hashrate. This doesn't do that.

kendog77

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Has anyone tried just reducing the clock speed and measuring watts used at the wall?

Since overclocking increases power consumption, it stands to reason that underclocking would reduce power consumption, wouldn't it?

crazyates

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noise23

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BM1380 chip specs:

Vlotage(V)	Hash Rate(GH/s)	Total power(W)	J/GH
0.75	1.60	1.07	0.68
0.85	2.00	1.69	0.85
1.00	2.50	2.82	1.13
1.10	2.80	3.70	1.32

It would be great to figure out how to undervolt S1 properly to get the best power efficiency.

nexus99

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Quote from: crazyates on March 15, 2014, 12:28:23 PM

Quote from: jelin1984 on March 14, 2014, 11:57:39 AM

Increasing the resistance slightly (opposite of a pencil mod) would help drop the voltage from 1.1V to 0.9V which is where you would be closer to 150GH/200W

So say I buy 6 Ant S1s, which is about the same price as an Ant S2. Underclock to 160GH/s, and pull ~200W each.

6x 160 = 960GH/s
6x 225 = 1200W

Not too different from the 1000GH/s and 1000W the S2 is doing. Cooling would also be a lot easier than normal, as the chips would be running much cooler.

So what's from stopping people from buying the shit out of those S1s and undervolting?

Someone figuring out how to do it is the first hurdle.

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Quote from: jelin1984 on March 14, 2014, 11:57:39 AM

Increasing the resistance slightly (opposite of a pencil mod) would help drop the voltage from 1.1V to 0.9V which is where you would be closer to 150GH/200W

So say I buy 6 Ant S1s, which is about the same price as an Ant S2. Underclock to 160GH/s, and pull ~200W each.

6x 160 = 960GH/s
6x 225 = 1200W

Not too different from the 1000GH/s and 1000W the S2 is doing. Cooling would also be a lot easier than normal, as the chips would be running much cooler.

So what's from stopping people from buying the shit out of those S1s and undervolting?

Littleshop

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Quote from: klondike_bar on March 15, 2014, 09:46:04 AM

Im a bit confused why you simly repeated what i posted as two seperate posts.

underclocking is simple, opposite of how you overclock - SSh into the unit, and change in the hex variable you want. If you go too low, harware errors may start to spit out all over. I think you could do 300MHz (~160GH @ 260W if i had to guess), not sure how much lower than that though

I think he wants to undervolt primarily not underclock. Some units (if they are like video cards) run fine on less voltage and therefore use less power for the same hashrate.

Underclocking and undervolting at once could make these units use far less power which would be great for the long term and if you are power limited.

I am assuming the voltage control is purely in hardware and not available with software so you would have to change SMT resistors.

klondike_bar

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ASIC Wannabe

Im a bit confused why you simly repeated what i posted as two seperate posts.

underclocking is simple, opposite of how you overclock - SSh into the unit, and change in the hex variable you want. If you go too low, harware errors may start to spit out all over. I think you could do 300MHz (~160GH @ 260W if i had to guess), not sure how much lower than that though

jelin1984

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Increasing the resistance slightly (opposite of a pencil mod) would help drop the voltage from 1.1V to 0.9V which is where you would be closer to 150GH/200W

jelin1984

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underclocking, you could probably get the S1 to be stable in the area of 150GH/250W

ok how i can do that any steps by steps details or link/?

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