SOLD - NO LONGER AVAILABLE

Hi, we're selling half of our mining operation (the altcoin/equihash half). Miners are in excellent condition and have only been used for the past handful of months in a clean Virginia host facility.

(45) Bitmain Z9 Mini Antminers $9,450 + shipping
or will sell in groups of
(5) Bitmain Z9 Mini Antminers $1,150 + shipping

(All Z9 Minis are batch 2 rated at 10ksol but these as a group average over 14ksol/ea. mostly at 650MHz)

We also have several 750W HP server PSUs with breakout boards, PCIE power cables, and PSU Power Cords (min 14AWG 15A C14 to C13) available at $40/set if needed.

Miners ready to ship out from Washington DC area within 12 hours of payment.
Shipping continental US only via tracked & insured USPS.
BTC payment via trusted bitcointalk escrow (buyer pays gift fee).
Serious inquiries only please PM.
Thanks!

Gizmoh, let me know if you find someone looking to buy 100 and I can make up the other half of the order.
I've got 54 Z9 Minis (batch 2) complete with PSUs and all power cables for sale located in VA.

I'm in the market for a kit or two and/or breakout boards for these PSUs if anyone's liquidating. Thanks.

It's a trial and error process. Your ultimate results will depend on which batch you purchased, how cool you're keeping the miner/room, and some luck. To troubleshoot, I always first reboot the miner and keep an eye on it. If it can't hold the freq that it used to be able to handle, then I try to figure out what changed. In all of my similar situations, the change was always the temperature in the room (one time I moved a miner to a hotter location, another time the A/C went out). Once I got the miner back to the same room temperature conditions it was in before, it worked like before. These boxes are a little finicky at the higher freq.

I would suggest reading through this entire thread starting at page 1. You will find all of the information on how to SSH into the miner, what the password is, the exact things to type, everything. There are various settings you can change in the config file, but the only one I've seen actually affect the miner is the fan percentage setting.

Most (but not all) batch 2 units have the new firmware - the new firmware has only one setting in the advanced performance drop down menu that says "balanced." That setting equates to a frequency of 500 MHz.

Report from a Discord thread about the new firmware:
"Tuning is way different on new firmware. Unless I didn’t notice this before, we now have balance, balance ++,factory, performance-, performance, and performance+. Tuning to performance+ now. I was getting a steady 52Ksol at factory."

Here's hoping it will solve the memory reboot/shutdown issue. I was an early adopter of the last firmware version and was disappointed that it didn't fix that. If anyone tries this one, please report. Thanks!

Thanks zuzuca, I appreciate it.

I use an HP 750W server PSU with my A9 and set the performance setting to "performance." (No other setting changes.) My sound meter shows a constant 49 db for the A9 and PSU together. Put another way, this thing is really quiet.
When it first boots up, it is loud because the fan ramps up to 100% or something. But then it settles down to 15% and the 49 db level.

I've done ZEN on zhash.pro (good experience), ZEC on flypool (minimal rejects and good experience), ZEC on dwarfpool (massive rejects), and am right now doing ZEN on luckpool with a 52-54 kSol average and 0% rejects. I've played with mining a single coin at a single pool, and also using Awesome Miner to profit switch between dwarfpool and luckpool.

My struggle so far with profit switching is a) finding good pools that have solid hash power going and that have proportional payouts, and b) losing a bit of time while the miner ramps up after a switch. The more you switch, the more time you lose. The less you switch, the less benefit you get from the profit switching method. Additionally, dealing with three different coins complicates my own calculations of daily efficiency and profitability versus just one and done.

I'm always happy to try out possible better options - what is the URL and port you're using for an ASIC on nanopool?

Brothers from another mother.

I installed the new firmware on Aug13 and my A9 still stopped hashing/went offline the other night. Lost about 6 hours of mining while I slept. A9 was still on, but pool showed the miner missing and I couldn't access the box with a browser. Requires a power off-power on reboot every few days when this happens.
I had hoped the new firmware would have fixed that issue but I guess I'm going to have to use the smart plug I bought and figure out the IFTTT method of having the switch reboot when the box goes dark.

I had two hashboards doing ~17 kSol/s each and one doing about 6.5 kSol/s. I contacted Innosilicon support via email with a screenshot of the summary page and they agreed that hashboard was bad. They gave me directions on how to send it back to them and said that when they received it, they would send me a new one. I followed their instructions on packing, took it to a DHL Express office, and sent it off. It's supposed to arrive to them in a couple of days. That shipping cost ~$100.

It's difficult to lose 6.5 kSol/s, but presuming I get a 17 kSol/s one back "soon," it will be worth it in the long run to take the hit of lost Sols+shipping cost now. The great thing about these ASIC boxes is that they can run without all of their cards (and interestingly, the controller board has more connectors so presumably one could add more boards to it). So it's at least still running at an avg 34-35 kSol/s which right now is getting me about 0.3 ZEC/day.

Whole situation just kind of stinks is all. Any hiccup has an opportunity cost (and with shipping, real cash costs too) so starting out with problems on an expensive box certainly takes some of the wind out of the sales. I feel for you guys with worse situations than this.

Thanks for the suggestion, minefarmbuy. Inno support told me that one hashboard is bad and I need to send it back to get a new one. Thankfully it doesn't look like they want the whole machine - just that one board. It'll be tough to give up even the 7 KSols it's doing while waiting for a 17 KSol replacement, but it'll probably be worth it so long as they can turn something around to me within a month or so. We'll see.

I've been running at 35% for the past few hours and my temps are 49, 49, 50.

My main problem is card #1 has only run at 6-7 KSols all day regardless of performance setting or overclocking (the other two cards run at a decent 16-17 KSols). I'm thinking I've got a dud card.