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It's fascinating watching you guys discus all of this. I wish I could contribute, but it's a good country mile above my head. Here's hoping a way to adjust voltage is found, since B8 definitely doesn't respond to increased 12V from the PSU as earlier batches do.
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Swap PSUs on S7 that doesn't turn on with the working S7's PSU. If it still doesn't turn on, RMA time. Good luck with bitmain....
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Fantastic progress, lightfoot. I just bought a cheap SMD rework station partly because of this thread. Hoping to fix a Titan cube and a few Neptune cubes with this info. Now for the n00b questions: When you say you pulled the caps, I assume it goes without saying that you replaced them with new ones. Did you use caps with the same values as stock? I'm wondering what I need to order before attempting any of this. Sorry if this is a dumb question, I've never done this type of work before. If you ever feel the urge to post pictures showing what you replaced, don't hold yourself back.   |
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I'd hate to see the other employees if King shit #2 only makes 40k a year.
Stupid idea op.
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Here's something to get out of the way right away;
1. Hash Rate: 4.73 TH/s ±5%
2. Power Consumption: 1293W
3. Power Efficiency: 0.25 J/GH
1293/4730 = 0.27~ Efficiency. So it is 0.25 efficient or not. It says +10% at the wall, as if you have to add it to the 1293W, then that would be even less efficient. So what is the truth?
They do give it a percentage where at the wall it is higher like you mentioned. 1. Hash Rate: 4.73 TH/s ±5% 2. Power Consumption: 1293W + 10% (at the wall, with APW3, 93% efficiency, 25C ambient temp) 3. Power Efficiency: 0.25 J/GH + 10% (at the wall, with APW3, 93% efficiency, 25°C ambient temp) I will send them a email to verify if it is closer to .27 on actual at wall. (It's weekend in China I might not have a instant anwser). Don't bother, they aren't to be trusted. We need to measure these things our selves. I'll eventually get around to measuring DC and AC on my B8 and post results. |
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The PSUs are quite profitable for them, not very high quality but it helps capture more revenue and profit per unit given the convenience for buyers of S7s
I don't know why you mention that the PSU is not very high quality. IMO The PSU is v+good quality, on par with quality of Seasonic 80PLUS gold PSUs. For e.g. they use top notch Nippon Chemicon high temperature capacitors, the cooling fan is a Delta part, etc. What they have skimped on is features for home miners, like foolproof PCI-E plugs, adjustable fan speed, 110V input, power switch. These PSUs are not noob friendly, but for the seasoned miner who knows their stuff. https://bitcointalk.org/index.php?topic=1060439.200I reallllllly doubt they are anywhere near the level Seasonic are at. We're talking about bitmain here.... And comparing them to one of the top dogs in the PSU industry. The 1600w bitmain PSUs aren't bad, for sure, but we haven't had a proper review of them. We have no clue what the regulation or ripple numbers are. I wish bitmain would send a sample in to jonnyguru. |
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Got a batch 8 in today, disappointed with it. Only runs at 4.6Th/s.  hows the power consumption? can you confirm the control board has removed connections? thanks Didn't have time to get measurements for power use yet. Yes, control board is missing 6 data ports and 4 fan headers. Notice the very high hardware errors at stock settings. bitmain is selling us cheapened out to the max, overclocked junk. Thanks, bitmain.  wow are you running it in a really cold room ? Heres what I noticed, put fan speed on manual, and play around with it. I went from 4500ghs to 4700ghs depending on which fan speed setting I have. soft reset until you get it, and then dont touch it. edit: your hw rate is too high. you must bring those temps up a bit, or play around with fan speed. I run at 35%, 3000-3120 rpm, its 4700ghs and 58 to 60 temperature. I had bad ghs before and same hw rate as you. now its 0.0032%. Got a batch 8 in today, disappointed with it. Only runs at 4.6Th/s. Hi Prelude, I did notice that was only 35 minutes of mining. I'm assuming you have reboot the rig from the system menu after startup and configuring the pools? I've found earlier batches I have had to be reboot sometimes a couple of times before getting stated hash rate. I know you have mined a long time, Sir. I'm just curious if you had already done those things? EDIT: I also noticed the HWE's [While not high] are higher than a lot of other rigs I have at 0.0012 to 0.0089 for many of my rigs. My HWE's would be about where yours is now but lower after a reboot from system menu. Brought the temps up by lowering the fan speeds, and quite a few restarts brought me to this:  Doesn't seem to get any better. Guess I have a lemon. |
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It's another way for bitmain to save pennies.
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Got a batch 8 in today, disappointed with it. Only runs at 4.6Th/s. hows the power consumption? can you confirm the control board has removed connections? thanks Didn't have time to get measurements for power use yet. Yes, control board is missing 6 data ports and 4 fan headers. Notice the very high hardware errors at stock settings. bitmain is selling us cheapened out to the max, overclocked junk. Thanks, bitmain. |
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Got a batch 8 in today, disappointed with it. Only runs at 4.6Th/s. |
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Are you switching all your PSU's to server PSU's?
If i "sell" those two 1100w server PSU (Quakefiend's) we discussed a few days ago, it would be to buy EVGA G2/P2.
If you're trying to do the same, but to selling EVGA's to get Server PSU's, maybe we should just swap?
Sent you a PM. |
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You can't buy knowledge. Spend a few dozen hours educating yourself before you proceed with your venture.
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I upgraded my 4.86TH/s S7 to firmware v 20151211 with no problems. Anybody know what improvements or fixes were made since oct.?
No idea thanks to bitmain's legendary incompetence. |
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Maybe not the right place to post this question, but what is the max load (at the wall) 2880 W PSU can handle day in and day out?
90% of 2880W, 100%?, 110%?
They can be run 100% without issue. I'd even say pulling 3000w from them wouldn't be a problem. |
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Pretty much. The 3% power savings with a platinum on 230v vs a gold unit can make a lot of sense when running 24/7 with a bunch of miners depending on your price per kw/h. |
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No, it's rated for 125v. I'm just saying that it also works on 240v.  |
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