Thanks for the info guys. Running 280v is a great idea -- I'll see if my panel has room. I was going to have a new circuit pulled anyway, that would probably make sense. (I ordered multiple machines and have crappy old electric.)
Looking into the redundant server PSUs, those seem to be designed to hit the max rated wattage, e.g., not be run in parallel -- the ones that are rated 750W state that combined they should never exceed 750W. If that's the case, it's probably beyond where I want to go with this.
Maybe if I stick to OC 10% and hit somewhere like 1200W or less PSU it might be somewhat helpful, but not break the bank (or the X-3).
Topic: Power Supply to Overclock Prospero X-3? - page 2. (Read 3776 times)
Also, have you preordered it yet? I'm trying to preorder it and the website is saying they don't ship to the US. I'm not able to complete the checkout due to the shipping address I entered.
Yes, but I ordered from MinerSource.net. They're located not far from me in St. Louis.
Typically, overclocking and overvolting means an exponential increase in power consumption. The power draw in a typical CMOS IC is actually mostly charge displacement from turning on and off transistors, which said charge increases with voltage and the number of displacements increases with frequency.
As an example, my max-overclocked Blades run 16.384MHz at 1.25V and consume about 135W of power, at 9W/GH
The stock blade runs 12MHz at 1.05V and consumes about 85W, at around 8W/GH. The power draw does not increase linearly with the speed increase, or with the voltage increase, but with both.
To be safe, looking for a 20% increase in speed, I'd opt for a (1.20*1.20=)1.44x increase in power supply output just in case. This is probably overkill, but overkill also means safety margin.
Since you're not terribly likely to find any 1500W supplies for less than entirely-too-many dollars, I'd look into getting two smaller server supplies (750-1000W) and running them in parallel. Most server supplies are built as redundancies, where two or more are run together in the same machine and are built to load-balance outputs between them.
As an example, my max-overclocked Blades run 16.384MHz at 1.25V and consume about 135W of power, at 9W/GH
The stock blade runs 12MHz at 1.05V and consumes about 85W, at around 8W/GH. The power draw does not increase linearly with the speed increase, or with the voltage increase, but with both.
To be safe, looking for a 20% increase in speed, I'd opt for a (1.20*1.20=)1.44x increase in power supply output just in case. This is probably overkill, but overkill also means safety margin.
Since you're not terribly likely to find any 1500W supplies for less than entirely-too-many dollars, I'd look into getting two smaller server supplies (750-1000W) and running them in parallel. Most server supplies are built as redundancies, where two or more are run together in the same machine and are built to load-balance outputs between them.
Your amps are right. There are calculators online to calculate that. I'm too lazy to find one right now...
you can possibly run 208V single phase if your panel will handle it. I think the X-3's will run on that. If you've got a hot tub, electric stove, oven or dryer, you may be running it already. Tap in there. get a multimeter for 15 bucks and check your voltages.
In terms of overclocking, that seems right, although you'd probably want to go higher than the advised 20% or you're going to blow out your PSU if it's running 100% duty cycle. I'm stocking a spare as it is. I do not think you can just piggyback supplies, so you're likely going to have to get a single beast if you're going to go this route, although I could be wrong.
I'm not planning on OCing mine, as I don't want to be shipping it back and forth and hoping they fix it if I cook chips, but good luck with that. Keep it cool and you might get away with it....
you can possibly run 208V single phase if your panel will handle it. I think the X-3's will run on that. If you've got a hot tub, electric stove, oven or dryer, you may be running it already. Tap in there. get a multimeter for 15 bucks and check your voltages.
In terms of overclocking, that seems right, although you'd probably want to go higher than the advised 20% or you're going to blow out your PSU if it's running 100% duty cycle. I'm stocking a spare as it is. I do not think you can just piggyback supplies, so you're likely going to have to get a single beast if you're going to go this route, although I could be wrong.
I'm not planning on OCing mine, as I don't want to be shipping it back and forth and hoping they fix it if I cook chips, but good luck with that. Keep it cool and you might get away with it....
I read/heard somewhere that 20A is pretty standard per circuit in the US, Don't quote me on it, I would like a definite answer as well.
Also, have you preordered it yet? I'm trying to preorder it and the website is saying they don't ship to the US. I'm not able to complete the checkout due to the shipping address I entered.
Also, have you preordered it yet? I'm trying to preorder it and the website is saying they don't ship to the US. I'm not able to complete the checkout due to the shipping address I entered.
I realize this is kind of speculation, but if overclocking the X–3 is practical, I’d suspect it would be pretty worthwhile for the first month or two. At least until all the TH/s miners get out and installed.
In the specs for the X–3 there’s this note:
And later:
Given: Power Consumption (Watt): 1050
Can we assume that we would need a PSU with 1050 + 20% = 1260W capacity? Is there any chance that a second, low capacity PSU could be added, rather than purchasing a 1200+ unit for several hundred dollars?
Should I expect this to be plug-and-play to swap the new power supply in? I’ve built a PC before, so am ok with that, if that’s about the skill level that would likely be required.
Finally, does this look right for power in the US, with 120 volt service? 1200 Watts / 120 volts = 10 amps. So I’d need service with at least 10 amps per machine?
Thanks!
-Tom
In the specs for the X–3 there’s this note:
Quote
Note: In theory the ASICs could be overclocked up to 128 Ghash/second but we cannot guarantee this until thorough testing. This would raise the speed up to 2560 Ghash/second but will increase the power dramatically which will not be supported by the supplied PSU.
And later:
Quote
It has been designed to be: Over-clocked with around 20%. Increasing the voltage might be required. If voltage is increased, the efficiency will drop.
Given: Power Consumption (Watt): 1050
Can we assume that we would need a PSU with 1050 + 20% = 1260W capacity? Is there any chance that a second, low capacity PSU could be added, rather than purchasing a 1200+ unit for several hundred dollars?
Should I expect this to be plug-and-play to swap the new power supply in? I’ve built a PC before, so am ok with that, if that’s about the skill level that would likely be required.
Finally, does this look right for power in the US, with 120 volt service? 1200 Watts / 120 volts = 10 amps. So I’d need service with at least 10 amps per machine?
Thanks!
-Tom
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