Hi
I have a client looking to buy 200 S9 antminers. We source these machines for him and take a % commission of the sale price (from the buyer NOT from the seller)
Please message if interested
Seller will be paid via btc escrow service ideally - I am new to this forum but I'll have a look for a trustworthy user to oversee this sale. Both parties have to be happy with the user that provides the escrow service
To clarify, we don't buy these machines but act as middlemen for it and take a % commission
p.s. if you have <200 S9s for sale please get in touch as buyer may still be interested
ideally seller from US but will consider international sellers
Well if you're not just bait, then you'll want to use OgNasty. You,d have more luck buying batches of S5-S7 though. Larger deployments usually don't dump their current gen gear. |
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Are the new batches of S9's so inferior to the current ones, that they warrant buying older S9's at full price? o.o;
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I would take it before it got down to 20 dollars, of course as a Canadian i don't have a US shipping address, so.  (I do have a 280 dual-x that died on me recently) |
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Is aliexpress safe place to buy antminers? They are china company but is bitmain officially selling their products here? I haven't checked it but I have seen that prices are more lower and also shipping costs. So what's about threads subject, that electricity price is really good to start mining and in my town, Bitfury is paying that price on electiricity and while there was created their biggest datacenter and millions were invested, it means it is profitableand to my mind even with low budget it worths but it will be better to buy latest antminer. Yes its good, yes its safeish. Aliexpress is a China Ebay, basically. If you pay with CC you can always chargeback so... I have no personal experience buying Antminer there, but thats usually where i pick up my risers at half price. |
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I doubt, the sensors have been its own chip on the board in the past, not embedded at all. Switching the airflow only changed the readings because the chip was getting less backdraft. Since you're describing the same results and conditions as older antminers, it would be safe to assume its the same effect occurring.
Might be a good idea to buy a cheap digital/laser thermometer.
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You might want to consider lowering your prices. For your Civilization VI key price is 32$, if you look at g2a.com price is 35$ and not to mention that they accept BTC payments too.
I should lower my prices, because they're lower than G2A? Lol I'm not sure what this guy is saying either, but do the game keys activate on steam after you get them from the amd site? Yeah, or your money back. I was told AMD is starting to introduce some extra validation steps though so i will need to check if i need to redeem the code myself and gift the game. |
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Virosa, I don't doubt your experience one bit. We're making broad generalizations here, and generally speaking ATX PSU's don't last as long or as consistently as server PSU's at any level of load in my and most others' experiences (hello S2 PSU's!). You are definitely right that quality goes a long way, but you pay dearly for it. Also, ATX PSU's are typically built for peak draw demands and aren't expected to operate at over 90% load for extended periods of time. Server PSU's are designed to operate in steady states of load, and I imagine even in server settings that load level is expected to be considerably higher than that of a typical PC. It's about intended usage. Just out of curiousity, what is the voltage at the plug that your ATX PSU puts out under 100% load? In my experience the voltage starts to drop off above even 50-60% load. I wouldn't be surprised that @ 100% you are at or even slightly under 12.0V.
One thing ATX PSU's have as an advantage over server PSU's is their fans/cooling and resulting ATW efficiency. 80+ efficiency ratings do not take fan draw into account, and since ATX PSU's aren't as restricted in form factors as their server counterparts, they can use lower power fans to manage similar wattage ratings.
Was more to fill the gap than throw out the previous recommendations. 12.04~ ish, they dont budge much at load, +- 0.02v, And that may just be the multimeter i use. These PSU have 10years warranty, i've been using the f out of them for years(often at TRUE DC 100% load), its a love story. These are EVGA G2/P2/T2. I pity anyone that get cheap ATX PSUs, it seem a lot of people cheap out on their ATX PSU, pay the price, and are better told to just not do it. Thats not ATX PSUs as a whole  , dont give me dearie a bad name! But i do have hard reasons to use ATX, and its not to save money lol. |
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Hey Fuzzy, Fin,
I really respect your opinions. What would you say to using a 'high end' consumer psu - one listed above - running at most 60% of max load instead of 80+%? Like a 1600W psu running a 900W miner?
Not ideal but if you already have the PSU then it should do well and be in its sweet-spot for efficiency. Again, even the high-end ATX supplies are not made for supplying only 12vdc at rated wattage. Part of that rating includes a couple hundred watts of 5v and 3,3v power expected to be used by CPU's, memory, etc. Throw in the usually too-thin PCIe cables used, the price of AXT supplies, the fact that many high wattage ones have 2 or more 12v rails, and things are not good. My 1600w PSU does 100% 12v just fine. Its rated for 1599.6w on the single 12v rail. Don't buy a shitty ATX psu and you will be plenty fine, minus the 300% markup/watt versus a server PSU, that is. |
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You might want to consider lowering your prices. For your Civilization VI key price is 32$, if you look at g2a.com price is 35$ and not to mention that they accept BTC payments too.
I should lower my prices, because they're lower than G2A? |
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Where are you located? I don't really need assistance or anything but if the price is quite cheaper than sourcing a rig myself... I could pick them up.
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Just got the R4
THE GOOD 8077GH USING 821 WATTS
THE BAD not whisper quiet and no freq or fan speed control
I get 62 db give or take 2 db
Thanks phil, well it is as figured. Silence for Chinese = 60dB. Their are all deaf from their 90dB mines. Could you show a screen of the dashboard? Maybe its overcooling the thing and we could hack it down somewhat? |
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You do realize that 7990 are very rare and hard to come by. I don't think anyone has 10-20 quantity.
Look for 7970 or 470 instead, there are loads of those.
Why are they desired in the first place? Price vs yield of hashrate for mining is better than these more expensive cards? I doubt so, considering how cheap 7970 pops up as refurb. But some people may want the GPU density i guess? Having power houses sound fun but its not very nice for deployments. |
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Beside, i'm pretty sure they still take order and are still fulfilling orders for bigger and private buyers. They're apparently much more considerate when dealing with people buying their miners by the palette, as well |
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Lol i'm going to bookmark this. What's the dB on them at 100%? These look like the sort of things i could hack a dial on and put 6 to 8 on parallel, could totally work if embedded in a sheet of plywood if they can run on reverse. Could split half on their own dial and switch to intake and or exhaust without messing with the "install". Then install a metal mesh on the exterior side to wrap low performance air filter to prevent snow and maybe some light rain from coming in and also preventing your neighbor from wondering wtf.  It would definitively beat the 110$ 20" metal box fan i just bought in term of setup solidity and versatility. Hell i could even hook the dial up to a raspi or arduino and control them remotely or with a script. |
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Your big concern with the setup, I think is that you want to have an in and out fan beside each other,
Your best bet will be to pipe in the outside air to the back side of the room.
You could likely run 2 5" dryer liners in over and down the back wall, and get away with a large exhaust fan.
As for the CFM you are after, you will never get a silent version. That's going to be hella noisy lol
Yes let me just explain to my landlord why i want to take down a wall from his apartment so i can have two windows And i never said silent, two box fan at full speed arent silent at all and the CFM is plenty, they just dont have enough pressure so a bit of wind and BAM they basically stop their spin. A metal equivalent with more angled blade would be quieter, but much more performant! I'm sorry did I say take down a wall??? If you are going to be rude, read the fucking comment. I said pipe the fan for intake an exhaust to different parts of the room. That's a matter of running a line, not using a second window. I also stated use a furnace fan, but I see you thank someone else for that. I'm done helping. Good luck There is no need for that. And Bye. What are the dimensions of the room (LxWxH) and dimensions of the windows and quantity?
There's a lot of HVAC calculators out there for air exchange CFM requirements, if you want to do it right this is how you do it.
Having a pile of miners running with the air just blowing willy-nilly in the room is going to create hot and cold spots, you want to read up on fluid dynamics, turbulence, what causes dead zones, and visualize the airflow in the room.
Put the big furnace style blower as an exhaust fan in one window and an array of cheap box fans to keep the air moving from the inlet window, if you can create a wind tunnel effect across the miners you will be better off, but I don't know the layout of the room and what we're working with here.
Draw it up or post pics or both.
Well i think its overcomplicating it, since 2 box fans are doing the job. But have too low pressure to keep the air going when the wind hit them or if i add a filter to catch the snow. But i'll add some details at the end of this post. Thats an interesting idea. The blower type fan i saw were extremely loud, i wonder if i could build an array of them (slower/quieter ones) and pipe the exhaust to a wooden frame that would hold the exhaust in the window. Way too expensive setup for my usage but maybe for my next place. Hrm. Definitively noted. Virosa this is a good idea. I was looking into larger industrial exhaust fans like this: http://www.princessauto.com/en/detail/18-in-single-speed-ventilating-fan/A-p0772343e;jsessionid=YjEYeEHB2F0F3ZtnGxZTpI37.pal-prod-com1 for myself, but it would probably be too loud for your application. Actual furnace fans aren't that loud, or they wouldn't be tolerated in homes. Why don't you try to find a trashed furnace and salvage the fan out of it to see how it does? It can't be worse than the plastic box fans, and can be ducted way easier. No idea where to find that, its illegal to loot scrapyards here. They're fenced and shit. ---  The window opening is 16inches by 48~ inches. The room is small, like 3x3x2.5meters. Red is hot spots, circles is because there are portable rigs sorta spread out, but not really like in the pic. Yellow arrow is box fan airflow. The red line is a rack, 80% of the heat come from there. And top right is the window, the top box fan push heat out and the bottom one pull cold air in. I'm pretty sure the metal 20" box fan will be good enough replacement for the intake fan + a filter to prevent snow from snowing on my rigs. |
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Your big concern with the setup, I think is that you want to have an in and out fan beside each other,
Your best bet will be to pipe in the outside air to the back side of the room.
You could likely run 2 5" dryer liners in over and down the back wall, and get away with a large exhaust fan.
As for the CFM you are after, you will never get a silent version. That's going to be hella noisy lol
Yes let me just explain to my landlord why i want to take down a wall from his apartment so i can have two windows And i never said silent, two box fan at full speed arent silent at all and the CFM is plenty, they just dont have enough pressure so a bit of wind and BAM they basically stop their spin. A metal equivalent with more angled blade would be quieter, but much more performant! I mined with ~5kw of gear in an apartment before. After going through a bunch of fans I eventually got this one. It is a beast; by simply running it on high with a second window open elsewhere ( otherwise you get mixed pressures ) it would lower the temperature in the apartment by 30 degrees in under a minute. Can run as intake or exhaust without moving the fan. One of these should do the trick; 2 of them for sure. https://www.amazon.com/Lasko-2155A-Electrically-Reversible-16-Inch/dp/B00FXOFNYQ/I saw these before, seemed flimsy and low CFM. I didnt try them because they seem to be built around fitting the shroud in the window opening and mine is 16.5inch~. But i was hoping to find a reversible fan like that, made from metal, that would fit my windows. I wonder if i could remove some excess mounting material so i can fit 2 in the kitchen (much bigger window) come summer. I could maybe turn the place into a farm and go live somewhere else. Hrm. I went with the 20inch metal boxfan since it has several time more pressure as the plastic ones, it should be able to pull air through a filter (so the snow doesnt get in). Thats an interesting idea. The blower type fan i saw were extremely loud, i wonder if i could build an array of them (slower/quieter ones) and pipe the exhaust to a wooden frame that would hold the exhaust in the window. Way too expensive setup for my usage but maybe for my next place. Hrm. Definitively noted. |
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Had no idea you had close to 20,000 Watts of gear in a small apartment, free power FTW.
But honestly with that much heat, no idea if any of those fans will work unless its a huge blower fan but those are crazy loud. When temps get down to -30C you shouldn't have an issue then.
No idea how you survived the summer.
Its a big appartment And i'll get even bigger next year. And I dont have that much yet but close, 15kW~ atm at full power, but i'm planning ahead. Up to 80 AMPs 250v, but that would mean no Oven like 1 year ago Who need a cloth washer/dryer when you can have a farm, right? Summer was easy, Both 20" on exhaust and living room window open, patio door open etc. So outdoor temp = indoor temp more or less. It worked very well. But i can't do that during winter, that would mean sub zero in my living room... |
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@Everyone You are all (mostly) linking me plastic toys fan, not understanding i need to vent close to 60000BTU so i will re-iterate, since i guess i wasnt clear enough; I already have two big 20inch fan in parallel in exhaust configuration, i need website sites where i can buy something better or similar heavy duty fans that i might have missed that i can get, at least as good as the one i linked in OP. I can find them all over ebay, but for some reason, i can't seem to find retail for them. So i must of missed some. If its -10C outside you really shouldn't need any fans, the high pressure/low pressure should force the cold air inside your room. Maybe open the door to your room so there is cross ventilation.
So, you think you can cool 20kW without fans? That won't do. I already have two 20inch box fan in parallel and its not enough, ergo the need for upgrade to metal window fans. Yeah i can't use these, its not even good CFM I thought of using 12 inches one in parallel but its not cost effective. Beside i have a 17*50 window opening, no reason to use something that compact |
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Can't you just wait another month until the snow falls and -30C weather ?
Also I use the same crappy $25 fans as you and they never vibrate. You can take them apart and lubricate the bearing and see if it fixes any issues.
I added a filter on intake to prevent the snow from coming in and one without for exhaust (but i want to put one on both to sorta hide the Boxfan during the winter). I have to run them on max for the farm not to overheat. They hum like a old fridge and they barely pull any air through the filter. One is only 1 month~ old as the one before just died. The farm get at >80C with near maxed gpu fan speed with -10C outdoor temp. What is your indoor temp ? 36C at -3C Outdoor, with both fans at speed 3, one out of two filtered. GPU fans at 75 to 100% and temps are 80C~ Ah yes, i got one of those bionaire. They basically don't do anything, it has about 1/10th the CFM of a box fan or 1/25th of a metal one and near negligible pressure, But while they are useless at extracting heat, they are useful for blowing air in between GPUs. |
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