How i can undrervolt Ant minter s1 ????????????

[jelin1984]

  ::)If undrervolt
Or under clock
S1 how much will be the power of watt per gh??

[jelin1984]

any details

[klondike_bar]

underclocking, you could probably get the S1 to be stable in the area of 150GH/250W. any lower and you need to undervolt it as well.

undervolting requires modification to the resisters associated with the TPS53355 chip(s). 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]

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/?

[jelin1984]

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

[klondike_bar]

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

[Littleshop]

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. 

[crazyates]

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?

[nexus99]

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.

[noise23]

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.

[crazyates]

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.

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.

[kendog77]

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]

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]

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.

[Syke]

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.

[jelin1984]

any details how i can exactly do these???


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

[Syke]

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]

150gh how much 200watt or not?

[crazyates]

150gh how much 200watt or not?

I'm gonna play armchair engineer for a few minutes, so bear with me.

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

Looks like DC/DC power conversions are somewhere around 35% inefficient on the S1 boards, and I'm guessing that's because of how hot the VRMs run. You've seen those thermal images that showed the VRMs as the hottest part? Well heat is nothing more than escaping (wasted) energy.  Then you add power for the controller board, fans, sensors, etc, and you're right at the 360W power draw a stock S1 pulls.

If you're undervolting, and pushing less voltage/power through the VRMs, I bet think they would not only run cooler, but also more efficient. Say you went with the slowest, most efficient voltage/clock setting, moved from 35% inefficient to ~20%, and then re-added the fixed power consumption stuff like the controller board and fan (running at a lower setting). That's almost the same 1W/GHs The S2 are doing.

Each S1 has 64 chips, 32 on each side, and they're using the bottom one, the least power efficient. I estimated the frequency of the chips assuming that frequency is directly linear with hashrate. Here's what happens if they were to use the other frequency/voltages in an S1:

Frequency(MHz)(estimate)	Voltage(V)	Hashrate(GH/s)	Power(W)(chip level)	Total Power(W)(estimate)
350	1.10V	179.2	236.8	355
320	1.00V	160	180.5	265
260	0.85V	128	108.2	165
205	0.75V	102.4	68.5	115

In fact, I bet that's what the S2s are doing. They're running hundreds of chips, at a low voltage, with better VRMs, inside a giant 4U case with huge heatsinks, and fewer fans. BAM there's your power improvements.

But none of this accounts for OC room. 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).

[jelin1984]

These how I can do at my antminter


320   1.00V   160   180.5   265