Since the 8th didn't activate, that means it IS a power issue.

Remember that USB hubs after the 4th port tend to just add another "hub" to the 4th port to give you another three.  Since the computer is so old I suspect that the USB ports don't give enough power (despite the power block) to power the ASICS.  Not to mention that you should be able to only run 8 on this rig (anyways) since there isn't enough current to power all 10.  Each ASIC requires .5 A and 5V for a total of 2.5W.  The hub's power supply can give (at max) 4A.  This doesn't account for additional current draw from the USB port.  Basically to get a ten port HUB you have to use three hubs. 

PC USB -> Hub 1 (3 ports available)
Hub 1 port #4 -> Hub 2 (3 ports available)
Hub 2 port #4 -> Hub 3 (4 ports available)

3 + 3 + 4 = 10 ()

Now for a little on the HUB.  Remember that when using a HUB the USB ports of the HUB (without power supply) must share the .5A/.9A/1.5 A (in order USB 2.0/3.0/Dedicated charge) across all of the ports.  However when you throw a power supply into the mix the amount of available power per port drastically increases.  Older motherboards may only give .5A (USB 2.0) which would at best allow you to add in one more device but this is also used to power the additional "hubs" to get more ports.

What confirms this is a power issue IS that it works on a newer rig.  Many new motherboards and systems have what's called "dedicated charge" ports along with USB 3.0.  With the move to USB 3.0 the total current draw was increased to 900mA and dedicated charge ports are rated up to 1500mA.  However, on an XP machine I doubt that you have USB 3.0, most likely (99.99% chance here it's) USB 2.0.  USB 2.0 is rated at 500mA maximum, not counting dedicated charge ports which on an XP era machine were RARE (usually a different colored port to check-> yellow/blue as red indicated eSATA/USB combo).  With the additional .5A you *could* run 9 ASICs but that's NOT taking into account the power that the hubs require, which is probably around .5A since you can't use more than 7 ASICs on the XP machine.

On the newer rigs USB 3.0 ports tend to put out around .9-1.5A (if dedicated charge) so people can charge tables and such without having to use a wall outlet.  So if we add 1.5 A (i3) + 4 A(hub) = 5.5A/.5A (per device) = 11 devices on a dedicated charge port.  However, even if we use the .9A that's 4.9A which gives you ~9.8 ASICs powered.  Since we know that the hub uses ~.5A you still have enough room to power the 9th device (with some wiggle) on a .9A port and 10 on the 1.5A but NOT enough to power a 10th/11th accordingly (I know the hub is 10 it's just a part of the explanation).  Normally I'd say use one less than the max possible (available Amps / .5A) but since you have to subtract 1 device (or .5A) to account for the HUB this is taken care of for you since in most configurations you'll have MORE than the needed power for MAX-1 ASICs but not enough to fully power the last (-1) ASIC.

So, this can't be a driver issue or Hub issue since 7 of the ASICs work and this shows that Windows XP is detecting the devices since if it was a driver issue NONE of them would work.  Because the 8th just doesn't do anything, it tells me that the older USB port just can't provide enough power to run the additional device.

As for your question about testing, unfortunately manufacturers are greedy and like to cut corners.  If they reduce the power to a USB port (or use the absolute minimum) they can reduce some heat that goes through the system (along with wasted power).  They also like to include power supplies that *just* barely have enough power to power the system under load (sometimes not even that).  So it's going to be hit or miss on this. 

I'd recommend trying to find a mid-2011 mac mini (obviously used) since in 2011 Apple implemented 1.5A per port so you could charge your i-devices without issue.  Currently I am running 36 ASICs off of two ports, daisy chaining the hubs a bit (7 port hubs) to give me enough connections and it's been running smoothly (with no hiccups) for about a month now.  However, I do have enough USB ports to add in 10 more ASICs but since the power supply is only 3A I can run at max 6 (but the 6th doesn't have enough power since I have to daisy chain to power so many on this rig) so I'm only able to run 5 per HUB.

So while I'd love to tell you that this is a driver issue and windows XP is just not doing it right, this really is a power issue.  Go buy another USB hub and save yourself the headache.

Ok, so there's actually a few things.

1.) This should be fine for what your doing.
2.) Ok, you can most likely put 3 ASICS on the back of your PC but I wouldn't recommend doing that, good way to fry a motherboard should the current be more than what it can handle.
3.) The two ports can host ONE miner.  That is all.

4,5,6)  This hub isn't going to be powerful enough to run all of these.  At most you could put 7.  Yes, the math (2.5W = 5V * .5 A) means that you *could* put 8 ASICS in this one hub (4000ma = 4A/.5A = 8 ASICS possible) but really you can't.  The ASICS user power to both mine AND send/receive data.  The draw will be too high and the hub might not be able to compensate even if it pulls more from the computer.

7.) it's an older model which confirms that the USB ports might not be up to snuff.  Manufacturers like to cut corners with power and the best place (was) to under power the USB ports.  Though they can run USB 2.0 devices most devices require less than the maximum power to run.

As a test, try plugging in 7 devices into the hub, then get mining running.  Once it's stabilized (wait like 5 minutes) try to add one more ASIC and WAIT until the light stops flashing on it and turns a solid green.  If your mining software detects it and starts work, great try adding one more until it stops working.  If it stays green see below:

If your using bfgminer you must get the com port that the new device is running on (open device manager while adding it) and press M then + (manage devices, add new device) then type in the corresponding COM port (e.g. //com8).  If it says No New Device (or no device found) then the device can't initialize and however many you've added to the HUB is the max that HUB can support.

If your using CGminer (with ASIC support) it should automatically detect the new device and just start working.  Keep trying to add (once the 7 are stable) until NO additional devices are recognized.  This is the max that the HUB can support.

BTW.  For all of you who say it's a driver problem your wrong.  His computer "sees" 7 of them, which means the drivers are working correctly.  3 (assuming OP bought 10 for a 10 port hub) don't have enough power to run.  He needs to either get another HUB and run 7 in each OR try using the ports directly on his motherboard (not recommended).  It isn't a driver issue here it's simply that the ASICS aren't getting enough power to run.

On a side note, try stopping the mining software and plugging them all in, they should all light up (solid green) because with NO work they only require a very small amount of power.

Also as otsaku said, try plugging each device in (alone) to the hub and see if it can start mining if it doesn't it might be bad (DOA).

Please let me know if this helps you.

Hey so I know your out of FTC and that the block chain went down, but my account still says I'm in the negative.  It's been three days and I'm starting to get a little worried.

NP, I love helping the community and though I'm still a "Noob" i've actually been pretty active.  I currently work with a small group of people who run a conglomerate of different hardware and currently get about .72TH/s and one of our devices is the Jupiter Miner.

However I will say this, don't pay too much more for the device than it's actually worth.  He's selling it for more as a convenience since KNC is currently sold out of both their Saturn and Jupiter so getting it through him gives you the opportunity to get it faster than if you waited for KNC.

I will say this though.  Be careful with this guy.  As stated in the item description he is holding the payment for 30 days so that your window to complain to eBay or Paypal closes.  Personally I would ask that he ship the item sooner and provide a tracking number and proper weight information for the device.  By waiting the 30 days he is literally free to do whatever he wants with your money and not ship the device as the transaction has cleared on paypal and eBay.  Just a word of caution.  I hope you win and get started mining.

Hey, could you please detail your rig?

Please give us the following so I can help you better.

1: Operating System
2: Onboard USB Ports
3: Front Panel USB Ports*
4: Ports on Hub
5: Hub Power Supply Details (typically on the power brick's sticker)
     -Input Voltage
     -Input Amps
     -Output Voltage
     -Output Amperage
6:  Where you are plugging these miners into (which ports on the HUB and the computer itself)
7:  If applicable: Computer Brand and Model Number

*3, front panel ports are usually connected via a cable to the motherboard and the available power is typically less then that from a USB port on the motherboard.  On my system I have two sets of Front end ports, 1 set of USB 3.0 and 1 set of USB 2.0.  Since they both require separate headers I can plug one USB miner into them no probrm (giving me the ability to use 2 miners on the front ports of the system).  I cannot test more because of the placement of the ports (their horizontal not vertical (grumble grumble)).

You have stated that your system is Windows XP so the motherboard *may* not be up to the task of supplying the proper power to the devices.  If the HUB isn't powered then your probably never going to get them working.  Please get me (at least some) of this information so I can help you more.

The USB asics can be a bit annoying to get running.

Personally I've found a few things that help.

1. Use cgminer as it is more reliable reconnecting miners that disconnect (for whatever reason).  bfgminer isn't as good at doing that.
        Link to Latest binaries as of this time -> https://github.com/kanoi/cgminer-binaries/tree/master/3.8.1
        if you are using cgminer, then please try updating.  If your on linux try compiling it from source.  If you need help with that let me know.

2. Make sure that your usb hub can power however many you are plugging in.  If these are the USB Block Erupters they require .5 A per device so a 3A power supply can power 6 devices (3A/ .5A).  They also require 5V so ensure that the power supply outputs at least that much.

3. If your on windows please, please, please update your drivers.  This solved all my issues.  Here's a good guide: http://bitcoinrigs.org/mining-resource/how-to-setup-asic-block-erupter/

4. When running it (via cmd, terminal, etc.) ensure that you are running as an ADMINISTRATOR.  Windows doesn't like to give access to com ports (IIRC it gets annoyed) unless your admin and linux sometimes adds the devices as root.  On linux to see who owns the devices (if these are USB Block Erupters) type ls -al /dev/ttyUSB* (please type the USB in caps).  This should show all of the devices on the TTY (com) and what ports.  IF their not there then something is wrong.  If they are and they are owned by root (or some other group than your username) be sure to run the miner using sudo (runs as root).  Alternatively you can chown the devices on linux:

(replace username with your username)

5.  Try a different HUB.  TigerDirect has a Dlink HUB (DUB-H7) that outputs at 3A with 6V (IIRC) and I use them to run 6 miners per hub (7 port hub) and they work beautifully.  Note if your using a Raspberry PI or some other device like that, PLEASE use no more than 5 per hub (Dlink) as it has MAJOR stability problems (i mean major) as apparently 6 pulls just enough Voltage to require some from the Pi and when you daisy chain them, it isn't enough to run multiple miners.

6.  Be sure to update linux (if your using it) as well with



(reboot is there to ensure that everything is updated as sometimes it has to reboot to finish)

I hope these tips help, and happy mining

Hey, first and foremost I'm going to tell you to be careful with buying/selling things on ebay.  Their really sticklers about anything with the word bitcoin in the name.  Additionally, if something doesn't feel right, back out.

That being said,

The KNC Jupiter is worth it depending on the price.  You should look up some calculators http://www.bitcoinx.com/profit/ is a good one and see what the cost is vs. the expected income.  Be sure to look up the power utilization for it as well so you know what your getting into.

Just know that he is up charging by $1,000 from what you'd pay to KNC but you get it faster.  Also know that this thing will be loud.  However a simple look at the calc:

Cost: $5999.99
Power Consumption: 1W per GH/s (note: not ghz) = 550W
Power Cost: assumed $0.15 (get this from your electric bill, they usually show you the average USD/kwh)
Hash Rate: 550 GH/s (note that this can vary based on a bunch of factors but should average out to around this)

Note: the conversion rate used on this site is from Mt. Gox (IIRC) and it's running a touch low.  Currently BTC-E.com is trading at $913.2/BTC and BTC China is trading at $1061.12/BTC so this field depends on where you are trading.  The conversion rate only affects how "fast" you recoup your expenses see below for more info.

Mt. Gox conversion rate:
Potentially Recovered Expenses in: ~20 days
Potential First month net profit: 3243.83 USD
Potential Second month net profit*: 8868.35 USD

BTC-E conversion rate:
Potentially Recovered Expenses in: ~17 days
Potential first month net profit: 4666.41 USD
Potential Second month net profit*: 10233.52 USD

Bitcoin China conversion rate:
Potentially Recovered Expenses in: ~15 days
Potential first month net profit: 6265.16 USD
Potential Second month net profit*: 11767.77 USD

*: Note that the second month profit assumes a stable difficulty (with a low increase) and that the USD/BTC stays the same (which is unlikely, it will fluctuate).  However this shouldn't discourage you as the possibility to mine using this is still great.  Additionally the second month profit shows the profit from the second month ONLY.  I got this by calculating one month, then subtracting the first month from the second to get the profit for the second month.  The calculator automatically removes the cost of the hardware from the first month's profit.

So, as to your question, yes this is a good starting device IF your willing to put up with the noise and the potential risk in the market (fluctuating USD/BTC rates).  Currently it is one of the better miners out there.  If your willing to wait though you could go through butterfly labs who is making a PCI card that mines at 600GH/s.  Both will require a fairly beefy power supply (pick one up from your local computer store or online).  KNC recommends a 1200W power supply with at LEAST 4 PCIe power connectors for their November Models so be sure to ask which month this was produced in.  The connector information will be shown on the specs for the power supply, and I recommend you spend the money on the 1200W version should you get this. 

If you opt for the butterfly labs PCIe card, be sure to have at LEAST an 800W, possibly more if you want to run additional cards.  On a side note I don't recommend the PCIe card for many reasons that are merely technical in nature, however I will warn you that butterflylabs has a rather odd track-record with the BTC community as many people are waiting for their orders from a while ago and now their about to ship these new ones so it's a 50/50 that they'll hold up (they ship just REALLY slowly).

As for lasting for months to come, I can't say for sure.  With the rate the global hash rate is jumping and with the difficulty rising you will most likely be buying another to keep up quite soon.  The good news is that the longer you have the first one mining the more money you can make which could actually pay for another one of these in just a few months (even with rising difficulty).

I hope this helps,

AJ

So i've been looking around for information on this but I can't seem to find any.

I'd like to create a remote system that uses PHP and calls to my servers to start/stop/monitor them.

Currently I have the RPC setup so I can monitor the miners.  This is the easy part since they have RPC calls to get status from them.  However, I was wondering if it was possible to send commands to them?  I can use PHP's exec to start and stop them (since it's not hard to get the PID).  However, I can't find a way to send them information.

e.g. update pool information, update worker information, etc.

IF this isn't possible I'll just use PHP to stop, then recall the instance using exec but if there is a "cleaner" way I'd appreciate it.

((Yes I get that I could write a class to do all of this for me, but I'd rather not at this time)).

Extra Info:

I manage 30+ miners that mine both BTC and LTC and we (the group I work with) use multiple workers per miner.  I know load balancing exists but I'm unsure of how it works/what it is.  I doubt it applies since we like to manage workers individually but it's worth a shot.

Thanks in advance for any information.

AJ

Ok, so I have been trying to get le litecoin reaper up and running.

Problem is I have everything setup right, well at least the CPU part of it is.  For the life of me I can't figure out how to get my graphics card up and running.  

Currently I have an AMD 4350 in one machine and a 4850 in another (I know their old don't care).

My reaper.conf is the default with just device 0 added (force gpu) except it doesn't do anything.

kernel reaper.cl
save_binaries yes
enable_graceful_shutdown no
long_polling yes

device 0
mine litecoin


Litecoin.conf is below

host litecoinpool.org
port 9332
user xxxxxx
pass xxxxxx


protocol litecoin

worksize 256
aggression 18
threads_per_gpu 1
sharethreads 18
lookup_gap 2
gpu_thread_concurrency 6144


Can anyone explain to be what I need to change to get this running?

Ok,

So now that I've gotten over the newbie restriction,

I saw in this post  https://bitcointalk.org/index.php?topic=76372.0 that Tittiez fixed the hashrate issue in mmcfe.  I have everything up and running but I can't for the life of me figure out how to fix this problem, it's acutally getting on my nerves at this point. Also, if anyone can recommend any other frontend that works, as in NOT simplecoin (working on getting that one up) please let me know because I have everything up and running... except for the front end.