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Received the e-mail yesterday that all prior BitMain customers should have received coupons towards purchasing several BitMain products, including the S4.
I had purchased (2) S3s back in September directly from BitMain - so believe I qualify as a prior customer.
When did people start receiving these coupons? I ordered my S4 on November 14th and wonder if I should be pushing for a rebate due to the failure of them giving me one?
Cassey
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How so on the SP20? Lower output, similar power requirements....
Power is always the primary concern for cost over time. Real world numbers ... 15% more power = 15% less profit or 15% longer to get a positive ROI assuming initial costs are equal. 1200w for 1.7TH 0.7 +0.8 for S3 S4 Ask the question, why it's difficult to get hold of a spondoolies but easy to buy a bitmaintech. Why are we still stuck on batch 11 for the s3's. Why are they giving such great deals at the moment. End of life products. (within the month most likely) 1200W for 1.7Th = 706 W/TH for SP20 1400W (worst case) for 2.0Th - 700W/TH for SP4 Where are you getting 15% difference? |
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How so on the SP20? Lower output, similar power requirements....
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I'm assuming there is no issue with stacking S4s? Or would running them vertical (PSU intake side up) be preferable?
They have rack mount ears--they are designed to be mounted in a DC horizontally. What I meant was stacking them directly on top of each other, without a cabinet supporting the weight of each unit. Although not the strongest case I've ever seen, I'd be comfortable doing 4 deep so long as the bottom one was well supported. e.g Sitting on a solid shelf, not front finger mounted support by 6 small screws. I wouldn't go more than 2 deep if the bottom one was only finger mounted. Also note they vibrate a bit - so use the rubber feet on the bottom one. |
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So back on topic... moved my box, freaked out when only one blade came fully online with a few chips on each of the other showing up. Powered down, open the case, and didn't see anything amiss. Closed it back up, powered it back up, and everything magically appeared! Had it running back at 200MH stock speed, at 0.72 volts, overnight and noticed just a couple of HW blips, so just nudged it up to 0.725 to see if that makes it 100% clean. Oh, also discovered the reason the alarm was randomly going off, hashing going to zero, and then recovering... the multicoinpool I used switched coins! Disabled the alarm for the nth time. Vaguely related: http://www.multicoinpool.org now has a 2048 min. diff port (3321) setup for SHA256 miners like the S3 and S4. We have noticed the S4 jumping up to 4096 occasionally, but the 2048 min. seems to have addressed the poor performance after a coin switch. FWIW: that was done per my request - great sysop there! Cassey update: After 90 minutes of runtime, my S4 is running at an 8192 diff on multicoinpool. |
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I use one called "Decobel 10th". Its free, but ad driven.
btw - my electrical room, where I put two GAW Black Widows some time ago, was running 75DB - and that was after I did some minor mods to change the pitch from a whine to a roar. Put the S4 in there last night. About 78DB in that room now.
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Defining LOUD: (measurements per my iPhone DB app)
Room with a number of computers, including (2) S3s: 60 DB - fairly quiet, no problems hearing people on the phone
Add (1) S4 running at 100MHs: 65 DB - Even with headphones, they better be talking pretty clearly
Running at stock 200MHs: 70 DB - Eh? What? Can't hear you.
Would be a great test for noise cancelling headphones with a directional mic.
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Ah, that makes sense. See that URL, the power consumption goes up in a hurry - they would have had to put a lot larger PSU into it to handle it.
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Ok - was just reading from the previous posted chip spec.
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Wow! http://puu.sh/cWvE3/072f5ed8f1.pngStock is 0.72V, at 0.85V the chip is pulling more than double the power for a 22% increase in performance. Presuming the GH/s is based on clock rate, that would be: 0.75V at 222MH 0.80V at 244MH and 0.85V presumably to add stability at the same 244MH, but at a 30% bump in power for that stability. |
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Running on www.multicoinpool.org in their profit switching pool. So far, so good. The sysop is setting up a high diff queue as we speak to help optimize for S3s and S4s. |
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Thanks - looks like I'm one rev out of date. Pulling now.
Running at 100mh and find the noise tollerable, scared to think of what 225 would generate. Really need to figure out some sound deadening approach around my rack.
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Just received my S4, ordered on the 14th, paid with bitcoin, received in the mid-west USA on the 18th.
First impression: My God its LOUD!
Startup: Seemless. Plugged it into a waiting 220V 30amp power strip and it came right up, connected to my DHCP subnet (10.x) and responded to my web-browser. Off and hashing on my chosen pool in minutes.
Questions:
1) Presume running at stock 200Mhs is a reasonable balance of speed vs. power (and obviously is within warranty)
2) Running 3.4.3.0 hardware and 4.6.1 cgminer. Is this the latest? If not, where do I download new code from?
3) Any sound-proofing ideas that won't impact cooling? System is rack mounted.
Thanks!
Cassey
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Add me in for $500, "Valued" at $780 due to reinvestments.
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ok,thx Cassey..i guess will continue mining with wallet,good luck finding something for windows ,if not we will Better Call Saul;)
But be shy about continuing your quest and posting success here! Surely somebody has a CPUminer compiled for Windows that came from the current github tree? |
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can somebody share his/hers settings how to mine over pools,i try everything from cgminer to vertminer,i think i tried 150 miners,but cant put it on work,i have amd fx-6300 cpu and sapphire r9 280x toxic cards...anyone...Cassey....!?
ps..you can even put it like riddle,i think i would faster make it work then this:))...btw,windows 8.1 i have..thx
You are currently limited to mining with the wallet given your configuration. Under windows, CUDA miner works, and under Linux both CUDA and Pooler's CPUminer (aka. minerd) work just fine. Alas, CUDA is only relevant if you have a NVidia GPU. I'm continuing to try and find a Windows version of CPUminer that will accept the scrypt:n parameter, but have not found one yet. I'm trying to build on from the github repository, but building under windows is proving challenging. Other miners like sgminer can not handle N=16 due, I believe, to their allocation of scratchpad space from the stack instead of the heap. They seem to break on any N > 14. Cassey |
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A bit of good news: one of the developers modified http://mpos.imacredit.org to display in Hash instead of KHash. Now you can track what your miners are really doing... Please do spread the load between pools if your not inclined to solo mine (preferred). The pool is up mostly so people can verify they are working, we are fine with temporary visitors. Cassey |
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{
"blocks" : 3690,
"currentblocksize" : 1000,
"currentblocktx" : 0,
"difficulty" : 0.00078303,
"errors" : "",
"generate" : true,
"genproclimit" : -1,
"hashespersec" : 0,
"networkhashps" : 15318,
"pooledtx" : 0,
"testnet" : false
}
Which looks quite heathly - about 3X the minimum hashrate to insure target block times. |
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Those rates seem right on. I have a number of machines that vary from 0.01kh to 0.08kh.
Having one of the dev's modifiy mpos.imacredit.org to report things in hash instead of k-hash. Will then start doing some testing around improving a motherboards performance by using dual memory instead of single, using a GPU instead of the onboard CPU based graphics (which shares memory with the CPU).
Will post when I get some results. Just thinking this might be the perfect excuse to buy some micro-ATX boards and hang them off my ASIC power supplies that are not using the motherboard power cables...
Cassey
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