Added more cards, Price edits.

http://imgur.com/a/fUz2d


2 x 7970  $90 Ea  Both are reference and clocked at 925Mhz
1 x 7950  $80   Ea  This card is also reference but has a 7970 cooler attached to it.

Added pictures of the 760ti's.

Hi,

I have some Black arrow Bitfury boards.  16 Chips per board at about 40 Gh per board.  Think I have about 40-50 of them including the ribbon cables.

These two 760ti's in SLI where besting a 970 overclocked in benchmarks we ran.  The 970 was clocked at 1500Mhz too.

I am downsizing due to an impending move.  Looking to sell most of my farm.  Will list GPUs here and continue to add to the list if a have more to sell.  Amounts will be in US dollars but I will accept Bitcoin (Coinbase rate).  You can pay me directly or use an escrow that we both agree upon.  Will ship anywhere but shipping is to be paid buy the buyer.

Edit (3/28): I also accept Ethereum, Expanse, and Zcash as well.  I use Poloniex exchange rate at time of sale.

Here is what I have presently.

1X 290x 4GB reference.  Sappire with Accelero Xtreme cooler branded.                                             $200  Ea plus shipping

1x 295x2  Use this card in a crossfire setup for gaming.  8Gb card (2 x 290x)                                     $495 Ea plus shipping

1 x 7970  Reference and clocked at 925Mhz                                                                                 $90  Ea plus shipping

5 x 380x  These are Gigabyte G1 gaming cards.  Purchased new and have boxes.                               $145 Ea plus shipping (added 3/8)

All cards are tested and confirmed fully functional.  These cards have been tested in games and mining.  This is not all.  I will be adding more
cards as I test them and take pictures.  Cards will be cleaned/vacuumed but may still contain small amounts of dust. Will include boxes if I have
them.

Here are some of the cards I will add.

7990's, 290's, more 280/280x's and 7950/70's.  Maybe some 270/270x's.

Link to pictures:

http://imgur.com/a/2bcJL
http://imgur.com/a/o7Aga

Will add more pictures later.  Please PM for details.  Thanks for looking!

Edit: added Bitcoin Asics:

Original block erupters with packaging, various colors.
49 port BE usb 2.0 hubs with boxes.
Many BFL monarchs.  Almost all are 100% functional.  Maybe 3 parts boards.
Asicminer tubes, 800Gh each.  These include the controllers.
Some Avalon stuff.  Mostly 3rd gen.
Terraminer parts. boards and watercooling.
A Spondoolies SP31 that has 4-5 dead ASICs but hashes fine.
Many antminer S1s, 180Gh or 100Gh each. (some are underclocked/volted for efficiency)

ALL of these work.  If they don't this is noted.

Will list more/update quantities  when I look in my storage unit.

It does not. This card has voltage test points on the back edge.  While powered up, When I check the voltages this is what I get:

12V            good  This is only the power from the pci-e slot
3.3V           good  This is only the power from the pci-e slot
1.8V           good  Don't know what this is, suspect power for the PLX pci-e bridge chip
0.9V           good  Pci-e I/O
GDDR5        dead  supply for the 32 GDDR5 modules
gpu1/core   dead  This is the low resistance gpu  (1.0 ohm)
gpu2/core   good  This is the normal resistance gpu (2.5 ohm)
gpu1/mc     dead  This is the memory controller for the "bad" gpu (3.5 ohm)
gpu2/mc     good  This is the memory controller for the "good" gpu (35 ohm)

I suspect the start-up sequence this card uses is to power up the core and memory controller for each gpu first and then the memory due to it being shared.
Likely it's firmware goes:

gpu1-->good?-->no-->crowbar.
gpu2-->good?-->yes-->turn on power.
memory-->do not turn on due to gpu 1 crowbar.

Sound plausible?

I have two XFX cards.  A 280 and 280x that I got with dead shorts on the VDDC (gpu core) supply.  Turned out to be a smd ceramic cap on the back!
Found it by putting a D cell battery across the VDDC and looking at the card with a thermal camera.  The battery had just enough current to make the
bad cap glow, but not enough to damage anything.

Currently have a Devil 13 dual 290x that has some strange measurements.  One of the gpus shows much lower resistances than the other.  Looking like it might
have a fried GPU.  Do wish I could find pinouts or datasheets on these things.  I am going to try lifting the choke(s) to confirm where the shorts are.                         This card is absurd as far as the power goes.  It has 15 power phases at 40A each.  5 per gpu core, 1 for each gpu memory controller and three for the GDDR5.         That's 120A just for the memory!

All of the AMD cards I have worked on have three dc/dc supplies on them.

1) 1.5V for the GDDR5. This one is usually fixed and consists of two phases.
2) 0.9V - 1.0V for the GPU memory controller I/O.  This is controllable via firmware and is often one or two phases.
3) 0.8V - 1.2V  for GPU core.  This is always firmware controlled and is usually at least 4 phases but some cards can have 10 or more.

I have seen shorts on all of these.  I have an Asus 280x that has all THREE shorted.  I have checked the gate of each mosfet and they are all good.
Thinking about pulling the chokes but when I apply current limited power to it and watch with a thermal camera the GPU die heats up.  Strange.

One of the cards that keeps popping mosfets is an older Nvidia 760ti.  This card always blows just ONE high side fet.  It will turn on, post then a variable
amount of time later (5-10 minutes) the PSU shuts down (shorted fet).  I feel the gate controller is to blame, could be wrong.   This card has 4 core phases and it is
not always the same one that pops it's high side fet.  This card also has the same core resistance as a working card.

Nice to see you working on GPU's.  I have a few stencils coming for tahiti/pitcairn/hawaii and I will take a crack at re-balling some of the units I have.  They look
like they use 0.5mm balls.  Can send you some of my "trouble" units if you want to try to fix them.  I have a few units that keep popping mosfets.  Have been trying
to find out a way to narrow down bad memory chips on cards.  Don't even know if this is possible without changing them one at a time.

Cheers!

Was hoping to not pay more than 0.05 BTC including shipping to Charlotte, NC area.  Might also be open to trades.

Looking for a cube to round out my Neptune.  Will pay with Bitcoin or Ethereum.

I have had three exactly 10 minute dropouts this morning.  I am a Miner/Seller of Equihash.  Has anyone else noticed this?

You could repair GPU's.  I have been repairing them with good results.  Many of the ones I repair simply have shorted mosfets or smd parts knocked off the back of the card.

I have found that every piece of equipment seems to have a "maximum clockrate to efficiency" ratio.  Meaning, clock higher and you increase electrical consumption

while gaining less linearity in hashrate.  A good example where the BFL singles.  When I had these I found that by dropping the voltage/clockspeed just a small amount, the

power usage would go WAY down.  The hashrate would drop just a little.  10% less hashrate but 40% less power consumed.  You just have to do the math to find

your optimum ratio.

Not considering selling.  Going to keep on staking.

I think I will keep my coins.  At least I make 200K TEK every 30 days.

That's great.  I solo expanse and watch the block explorer as confirmation that my node is synced properly.  Thanks!

That one works. How about: http://www.expanse.tech/explorer/

This is the one that is behind.

Anyone know what's up with the block explorer?  I have not seen it update since yesterday.

Purchased this card, still looking!

What is your asking price?  Do you have pictures of the card?  You can PM me with details if you like.