[Announcement] Block Erupter USB - page 32.

BlackLilac Grant

member

Activity: 72

Merit: 10

Quote from: erk on May 17, 2013, 06:30:21 PM

Quote from: yxt on May 17, 2013, 06:27:20 PM

GPU: + x W host PC
USB: + x W r-pi

BFL 5GH/s + R-Pi ($350 approx)

Magic = 1,000,000 TH/s free!

There is no product you can buy from BFL that hashes at 5 GH/s and will ship any time this year, if ever. Comparing a real in-hand product to vapourware is silly.

erk

hero member

Activity: 826

Merit: 500

Quote from: yxt on May 17, 2013, 06:27:20 PM

GPU: + x W host PC
USB: + x W r-pi

BFL 5GH/s + R-Pi ($350 approx)

yxt

legendary

Activity: 3528

Merit: 1116

GPU: + x W host PC
USB: + x W r-pi

erk

hero member

Activity: 826

Merit: 500

Quote from: HTML5 Gordon on May 16, 2013, 09:03:34 PM

But the 7950 uses 300w vs. only 10w for the two USB Erupters (they use ~5w each). So ~600MH/s for each, but vastly different power usage.

10Watts, lol, you convinently omitted the power consumption of the host computer on which the USB device depends. The cheaper price of the GPU pays for an lot of electricity. The point I am trying tp make is the USB devices are overpriced, the ASIC chip on them is worth under $10, and I bet all the rest of the parts are too. Look at how many parts you get on a video card by comparison.

alibert

full member

Activity: 196

Merit: 100

In Germany 1 kwh costs about 0.27 Eurocent, so GPU mining makes no sense.

muyuu

donator

Activity: 980

Merit: 1000

Quote from: arklan on May 17, 2013, 12:02:45 PM

Quote from: GodHatesFigs on May 17, 2013, 12:01:21 PM

The 7970 card will still be worth a couple hundred dollars in a year; these USB sticks won't be worth anything.

sentimental value? Cheesy

They will be in museums. A piece of history Cheesy

arklan

legendary

Activity: 1778

Merit: 1008

Quote from: GodHatesFigs on May 17, 2013, 12:01:21 PM

The 7970 card will still be worth a couple hundred dollars in a year; these USB sticks won't be worth anything.

sentimental value? Cheesy

GodHatesFigs

full member

Activity: 557

Merit: 101

The 7970 card will still be worth a couple hundred dollars in a year; these USB sticks won't be worth anything.

CumpsD

sr. member

Activity: 476

Merit: 250

Quote from: razorfishsl on May 16, 2013, 07:45:33 PM

Don't buy these cheap 10-12 way hubs, they are Cu**t designs

open one up and take a look
The PCB layout is along the lines of :

CHIP: con:con:con:con :CHIP:con:con:con

Rather than
con:con:CHIP:con:con: con:con:CHIP:con:con

So the USB lines are twice as long as they need to be, and they run 4*USB signals in parallel tracks side by side with no Guard bands

Then the PSU is just plugs STRAIGHT into the powerfeed for the chips... and back into the computer no VARs no blocking diodes.....

To safely power down your driving CPU you have to UNPLUG the USB cable first...........

The whole design has been thrown together by some cock sucker in a rice field.

Which hubs would you recommend? Powered with lots of ports

I'd like to power a Raspberry Pi from it, as well as some Ztex modules and the future Erupter USB sticks Wink

SpaceCadet

full member

Activity: 165

Merit: 100

Just mining my own business...

Quote from: mdude77 on May 16, 2013, 08:25:01 PM

For $400 you can get a 7970 that can easily get 600mh/s with a lot of power drain.

While I still think the Erupter is somewhat overpriced, the 7970 example only works if you already have a mobo (with ram and HD) and PSU rated to handle it. So you need to add at least $200 for that (assuming a headless, chasis-less configuration). With the Erupter (and hopefully the less expensive usb miners that will follow it!), you can pop them into any old device you already have lying around (or your laptop, for that matter!). Can't do that with a 7970!

erk

hero member

Activity: 826

Merit: 500

Quote from: PeZ on May 17, 2013, 01:25:40 AM

Quote from: erk on May 16, 2013, 08:53:07 PM

I get over 600MH/s off a 7950 that costs $300 and the USB device does only 300MH/s and costs 1.99 BTC= $235 or $470 for two.

Use your website calculator and you'll find the video card has about the same ROI time as two of these devices. Once you get to ROI, you will be making more bitcoin due to lower energy costs. With a video card you have to put up with heat, noise, bigger electricity bill, and one useless computer.

Anyways, if you are mining with a video card you should not be mining bitcoin.

Yes that's true, you normally mine what's the most profitable on the day, mainly scrypt coins, then convert to BTC.

PeZ

sr. member

Activity: 297

Merit: 250

Quote from: erk on May 16, 2013, 08:53:07 PM

I get over 600MH/s off a 7950 that costs $300 and the USB device does only 300MH/s and costs 1.99 BTC= $235 or $470 for two.

Use your website calculator and you'll find the video card has about the same ROI time as two of these devices. Once you get to ROI, you will be making more bitcoin due to lower energy costs. With a video card you have to put up with heat, noise, bigger electricity bill, and one useless computer.

Anyways, if you are mining with a video card you should not be mining bitcoin.

Henchman24

sr. member

Activity: 378

Merit: 250

Quote from: erk on May 16, 2013, 08:53:07 PM

Quote from: mdude77 on May 16, 2013, 08:25:01 PM

Hmm. Something is wrong with this picture.

For $400 you can get a 7970 that can easily get 600mh/s with a lot of power drain.
For $400 you can get two of these that gets the same with a fraction of the power drain.

How is a GPU ROI faster?

M

I get over 600MH/s off a 7950 that costs $300 and the USB device does only 300MH/s and costs 1.99 BTC= $235 or $470 for two.

There is another aspect I wanted to bring up. Having only recently acquired a couple of BFL FPGAs, I never realized how wonderfully low maintenance a dedicated device is, when compared to GPUs.

I spent 3 minutes doing a firmware flash, plugged them into the USB port and I'm getting an almost identical rate of 873MH/s from each device

No core/memory tweaking, no voltage mods, no afterburner, no gpu-z, no overheating vrams, no proprietary fans to replace,...

HTML5 Gordon

full member

Activity: 184

Merit: 100

Quote from: erk on May 16, 2013, 08:53:07 PM

Quote from: mdude77 on May 16, 2013, 08:25:01 PM

Hmm. Something is wrong with this picture.

For $400 you can get a 7970 that can easily get 600mh/s with a lot of power drain.
For $400 you can get two of these that gets the same with a fraction of the power drain.

How is a GPU ROI faster?

M

I get over 600MH/s off a 7950 that costs $300 and the USB device does only 300MH/s and costs 1.99 BTC= $235 or $470 for two.

But the 7950 uses 300w vs. only 10w for the two USB Erupters (they use ~5w each). So ~600MH/s for each, but vastly different power usage.

erk

hero member

Activity: 826

Merit: 500

Quote from: mdude77 on May 16, 2013, 08:25:01 PM

Hmm. Something is wrong with this picture.

For $400 you can get a 7970 that can easily get 600mh/s with a lot of power drain.
For $400 you can get two of these that gets the same with a fraction of the power drain.

How is a GPU ROI faster?

M

I get over 600MH/s off a 7950 that costs $300 and the USB device does only 300MH/s and costs 1.99 BTC= $235 or $470 for two.

You can do even better than that if you use cheaper video cards like a 5830 for $65 that does 300MH/s

see https://en.bitcoin.it/wiki/Mining_hardware_comparison for some examples.

The USB ASICs get more cost effective if you have several, however if you are going to go down that path you are probably better off waiting for a Klondike board or one of the other numerous Avalon chip projects on this forum.

abracadabra

hero member

Activity: 956

Merit: 1001

Quote from: mdude77 on May 16, 2013, 08:25:01 PM

Quote from: Xian01 on May 16, 2013, 08:23:04 PM

Quote from: erk on May 16, 2013, 08:16:44 PM

These things are not very profitable compared to a normal video card. The ROI on a video card is normally 2 months.

If you factor in electrical costs, it's more-than-likely a wash. I agree they are a little bit on the pricey side, but not egregiously so considering this is a first gen device.

Hmm. Something is wrong with this picture.

For $400 you can get a 7970 that can easily get 600mh/s with a lot of power drain.
For $400 you can get two of these that gets the same with a fraction of the power drain.

How is a GPU ROI faster?

M

IMO, the residual value of the 7970s is higher than that of the Block Erupter USBs.

Xian01

legendary

Activity: 1652

Merit: 1067

Christian Antkow

Quote from: mdude77 on May 16, 2013, 08:25:01 PM

For $400 you can get a 7970 that can easily get 600mh/s with a lot of power drain.

That's where it gets a bit more difficult to figure out. A 7970 will do at least 680MH/s overclocked for ~$400. Don't know the wattage off the top of my head.

Two Erupter USB's will pull a bit north of 600MH/s @ < 1W ?

I'm not good enough with stats and math to figure out efficiency of a 7970 vs 2x Erupters, but I'm guessing the 2x Erupters will ROI faster than a single 7970 if you take electrical costs into consideration.

mdude77

legendary

Activity: 1540

Merit: 1001

Quote from: Xian01 on May 16, 2013, 08:23:04 PM

Quote from: erk on May 16, 2013, 08:16:44 PM

These things are not very profitable compared to a normal video card. The ROI on a video card is normally 2 months.

If you factor in electrical costs, it's more-than-likely a wash. I agree they are a little bit on the pricey side, but not egregiously so considering this is a first gen device.

Hmm. Something is wrong with this picture.

For $400 you can get a 7970 that can easily get 600mh/s with a lot of power drain.
For $400 you can get two of these that gets the same with a fraction of the power drain.

How is a GPU ROI faster?

M

Xian01

legendary

Activity: 1652

Merit: 1067

Christian Antkow

Quote from: erk on May 16, 2013, 08:16:44 PM

These things are not very profitable compared to a normal video card. The ROI on a video card is normally 2 months.

If you factor in electrical costs, it's more-than-likely a wash. I agree they are a little bit on the pricey side, but not egregiously so considering this is a first gen device.

erk

hero member

Activity: 826

Merit: 500

These things are not very profitable compared to a normal video card. The ROI on a video card is normally 2 months.

Plug in 300Mhz into this calc and see for yourself, don't forget to put in the power consumption of the host system and your electricity price.

http://www.bitcoinx.com/profit/

The ROI I got was over 7mths.

Topic: [Announcement] Block Erupter USB - page 32. (Read 251926 times)