Topic: Set-up to run up to 25 ASIC units - page 2. (Read 6301 times)

You'll only need powered hubs if your running Jallies,the rest should be ok with non-powered hubs..........maybe 

What about the usb ports which attach to the rear slots and plug directly into the motherboard ?

I have msi gd70's from my gpu set-ups and have attached three of the usb add-ins directly to the motherboard which gives me 12 extra ports.

Does that solve the collisions ?

So only Avalon units have WIFI/Ethernet ? and BFL + bASICs have USB ports ?
I should have checked this out before I got a 8 port switch the other day.
Now I need to buy 1 or 2 powered USB hubs.

Agreed.

The USB root port PCI-E cards are a little pricey.  Might be worth it.

It should be pretty easy to get enough USB chips to fix scaling issues in any reasonable number. A lot of motherboards have USB3.0 through their chipset in addition to an additional chip like the VIA VL800, as well as a couple USB channels. Toss in a couple $10 PCI or PCIe USB cards and you should be able to run a few hundred thousand dollars worth of mining equipment on a single computer if your really wantedto.

I'm thinking something like this could be it and as they helpfully point out the front usb can be used internally for an OS drive. Four usb ports on the back, it is not too expensive, 25w max. power my only concern would be it is 32bit only and would that matter for running the mining software.

http://www.ncix.com/products/?sku=69271&promoid=1360

   Very interesting delimma,I hadn't even thought about this being a problem 

I hope its not true,if it is then we're gonna have to find a mobo or PC alternative with as many USB connections as possible.Any ideas,just in case 

Raspberry or such device maybe 

Bandwidth has less to do with it......., since actual bandwidth is quite small, the REAL issue is the protocol.
In another post I'd recommended that the  Chinese ASIC system could potentially scale better, since they have opted to include WIFI/Ethernet.

The problem with USB is that only ONE device can be on the buss at a time AND you have to signal connection & disconnection
Which means as the number of devices grows, so does the buss collisions.
Hubs solve F*** ALL, the same way that building more roads into a city does, all a hub does is increase the potential for collisions.

It is RAW ports that you need, since they decrease the chance of collisions by a power of the number employed.
Two RAW ports decrease the collisions by a power of two over the number of devices.(since you can split the USB tree)

Overall it is very difficult to work out HOW ASICS will impact the USB communication, because so little details have been released.

Consider the Implementation of a SIMPLE buffer scheme for returned nonces.

Take the following.....

Setup one:
Returns EACH nonce when found

Setup Two
Bundles up nonces and returns a batch every second.

consider that we find 5 nonces that are viable,
Setup Two will only negotiate with the USB ONCE every second, therefore the collisions are limited down.

Setup one will attempt to connect & disconnect ATLEAST 5 TIMES with the USB infrastructure, this will seriously impact the distribution of work to other devices, plus it is going to be exponential for each extra device.


Since the Damned ASIC vendors are telling us nothing about how the devices are implemented, we cannot plan ahead or work out anything.

HC

I use that one myself... very good unit imo. Be aware that it is infact 2 tiers of embedded (smaller) hubs.

So the only way to max out the chain is by linking 3 of these to the 3 of the 4 usb 3.0 ports on your primary.

 

I saw this http://www.manhattan-products.com/en-US/products/9583
So I think is the solution for your 25 ASIC units
24 USB2 and 4 USB3 so basically you have to buy 2.

The Porn? Or the BFGMiner?

Yeah, and a great wallpaper as well .

Too bad, that would have made some great miner-porn.

If you mean like see them in BFGMiner or something, they won't all fit on a screen, no matter how big it is (I tried for a screenshot) ... the text got so tiny as to be illegible and it still only had about 120 on the screen.

I would love to see that myself, would be awsome .

Yep, it would have to be watercooled, and come with a pad of some sort to go under it in case it leaks. With wings or something.

Gosh it's exciting to watch excitable people be excited!

162 BFL SC singles. wow. 

Oh noes,don't call it a MAXI Rig.....................PLEASE 

Watercooled MR would be sick!   Can you even consider it to be a mini-rig anymore at 1.5TH/s?

Sweet. Will the MR employ water-cooling? I believe I saw a pic of a waterblock for them a while back, IIRC.