Maybe something like this would be ideal: http://www.silverstonetek.com/product.php?pid=257&area=en
Topic: X6500 Custom FPGA Miner - page 22. (Read 220057 times)
Yay, glad to be in the FPGA subforum!
Yes, I have a bunch of those heatsinks. I'll set up a rev3 board with them for a test (it's nice to get actual temperature measurements instead of just guessing which heatsink works better). I'll see if Cablesaurus will sell them. There aren't a lot though, maybe just enough for the rest of your build.
Glad you got some improvements with the epoxy! I'm surprised you're still stuck down at 180 MHz with that board, though... Are both FPGAs acting up, or is one of them worse than the other? You may want to try another experiment with "tunneling" the air. If you took a piece of cardboard and angled it down to sort of funnel the air from the fan down to a smaller cross-section at the opposite end of the board, it should increase the air speed over the heatsinks. Lemme see if I can sketch that...
Ok, maybe something like this (airflow moving left to right):
fizzisist: do you have any of the blue heatsinks left over from the last batch? could you put them up on cablesaurus when the heatsink-less boards become available? Alternatively, where did you source them?
My arctic silver adhesive arrived a while back, just got around to doing the heatsinks on mine.
couple pics of the gluing procedure just for fun:
...
Results: previously 166 max board now does 180 (with 4% invalid), and previously 180 max board now does 200 (with 0% invalid).
I had to crank the fans up to 12V (were on 7V) to keep the invalids down on the under-performing board, which is consuming about 3 more watts.
My arctic silver adhesive arrived a while back, just got around to doing the heatsinks on mine.
couple pics of the gluing procedure just for fun:
...
Results: previously 166 max board now does 180 (with 4% invalid), and previously 180 max board now does 200 (with 0% invalid).
I had to crank the fans up to 12V (were on 7V) to keep the invalids down on the under-performing board, which is consuming about 3 more watts.
Yes, I have a bunch of those heatsinks. I'll set up a rev3 board with them for a test (it's nice to get actual temperature measurements instead of just guessing which heatsink works better). I'll see if Cablesaurus will sell them. There aren't a lot though, maybe just enough for the rest of your build.
Glad you got some improvements with the epoxy! I'm surprised you're still stuck down at 180 MHz with that board, though... Are both FPGAs acting up, or is one of them worse than the other? You may want to try another experiment with "tunneling" the air. If you took a piece of cardboard and angled it down to sort of funnel the air from the fan down to a smaller cross-section at the opposite end of the board, it should increase the air speed over the heatsinks. Lemme see if I can sketch that...
Ok, maybe something like this (airflow moving left to right):
fizzisist: do you have any of the blue heatsinks left over from the last batch? could you put them up on cablesaurus when the heatsink-less boards become available? Alternatively, where did you source them?
My arctic silver adhesive arrived a while back, just got around to doing the heatsinks on mine.
couple pics of the gluing procedure just for fun:
Results: previously 166 max board now does 180 (with 4% invalid), and previously 180 max board now does 200 (with 0% invalid).
I had to crank the fans up to 12V (were on 7V) to keep the invalids down on the under-performing board, which is consuming about 3 more watts.
My arctic silver adhesive arrived a while back, just got around to doing the heatsinks on mine.
couple pics of the gluing procedure just for fun:
Results: previously 166 max board now does 180 (with 4% invalid), and previously 180 max board now does 200 (with 0% invalid).
I had to crank the fans up to 12V (were on 7V) to keep the invalids down on the under-performing board, which is consuming about 3 more watts.
Are you still offering volume discount on these units.
Yes, the bulk prices in the first post are still valid! Email [email protected] to arrange a bulk order.
what's your shipping costs to germany?
thx
thx
This would be a question for Cablesaurus. Email [email protected], or I'll let him know to reply here in the thread.
I want to buy a few of these, but does it make sense to buy these if i get free electricity anyway and could buy used cards instead? power is not such a factor.
Maybe heat is.
I found out the hard way that it is incredibly difficult to dispose of the heat generated by, say, eight mining rigs in a small room (window wide open to the point of being an invitation for thieves) or just three mining rigs in a small room where the window doesn't open.
Also, space might be a factor. I've never seen anyone quoting hardware based on MH/volume, but the X6500 is roughly 8x9x2.5 cm^2, or 2.22 MH/cc. Bitcowok's planned setup is 30 of them in a what looks like a standard ATX tower. That would give about 12 GH/s, and consume about 500 W. I'd say that opens up the possibility of mining in a lot more apartments, dorm rooms, etc.
I want to buy a few of these, but does it make sense to buy these if i get free electricity anyway and could buy used cards instead? power is not such a factor.
Maybe heat is.
I found out the hard way that it is incredibly difficult to dispose of the heat generated by, say, eight mining rigs in a small room (window wide open to the point of being an invitation for thieves) or just three mining rigs in a small room where the window doesn't open.
I want to buy a few of these, but does it make sense to buy these if i get free electricity anyway and could buy used cards instead? power is not such a factor.
Depends on how much power you can realistically draw for "free". With GPUs you can pay them off much quicker and typically get a higher MHs/$ ratio BUT the increasing difficulty might hit you sooner than it would a FPGA miner for example. Then again you have free power so I don't think you'd care. There would be a point where it might not make sense to keep the ovens (gpus) running for say a meager BTC per day reward and there will also be a point where you can't expand much more given the power limitations that are imposed on you (depending on your location).
If I was you I'd buy cheap ass GPUS as many of them as I could and use a portion of the profits to slowly invest in FPGAs. Investing in FPGA is a long term investment in the future of bitcoin because it will take you at least 9 to 10 months to pay them off (just with the earnings they make)
I want to buy a few of these, but does it make sense to buy these if i get free electricity anyway and could buy used cards instead? power is not such a factor.
Unlike some of your other competitors. I won't say their name. 
Nor are they 4 months behind....Is it because the X6500 is just listed as "out of stock" at cablesaurus, and people don't know that there's a new batch coming in?
I don't see a ROI in 17 months as profitable,now 7 months I can deal with & no warranty makes it a moot point for me
I do not have money just layin around to wait over a year for a return,just me.
what's your shipping costs to germany?
thx
Are you still offering volume discount on these units.
New wesbite!
We're rolling out a complete overhaul of fpgamining.com today. Check it out!
I'm especially proud of the Gallery with user photos! Anyone else have pics they want to show off there?
We're rolling out a complete overhaul of fpgamining.com today. Check it out!
I'm especially proud of the Gallery with user photos! Anyone else have pics they want to show off there?
Fizzisist can you set up a donation pool for the algorithmic bitstream for the X6500?
https://bitcointalksearch.org/topic/algorithmically-placed-fpga-miner-255mhschip-supports-all-known-boards-49971
I'd love to see the X6500 get up around the BFL at a quarter of the power...
https://bitcointalksearch.org/topic/algorithmically-placed-fpga-miner-255mhschip-supports-all-known-boards-49971
I'd love to see the X6500 get up around the BFL at a quarter of the power...
I'd love to see that too! I think I'll wait until some more details are available though about how eldentyrell is planning to handle publishing it. If it will be fully open source and helpful to everyone using a Spartan 6, I think all the FPGA miner vendors should chip in. I don't think it should be up to customers to pay for it, but I wouldn't try to stop you guys from donating!
Have you decided on what cooling solution to offer with the rev boards?
Not yet, but tests are running as we speak. I'll keep you all updated!
Fizzisist can you set up a donation pool for the algorithmic bitstream for the X6500?
https://bitcointalksearch.org/topic/algorithmically-placed-fpga-miner-255mhschip-supports-all-known-boards-49971
I'd love to see the X6500 get up around the BFL at a quarter of the power...
https://bitcointalksearch.org/topic/algorithmically-placed-fpga-miner-255mhschip-supports-all-known-boards-49971
I'd love to see the X6500 get up around the BFL at a quarter of the power...
I saw that cablesaurus no longer has these on there website. Are they not taking orders for them anymore.
No, I think they're just preparing for listing the rev 3. Hopefully, this will be very soon!
Have you decided on what cooling solution to offer with the rev boards?
I saw that cablesaurus no longer has these on there website. Are they not taking orders for them anymore.
No, I think they're just preparing for listing the rev 3. Hopefully, this will be very soon!
I saw that cablesaurus no longer has these on there website. Are they not taking orders for them anymore.
They are currently out of stock, yes.
A new batch of 100 boards has been built and is currently being factory tested, and will ship to Cablesaurus soon.
I saw that cablesaurus no longer has these on there website. Are they not taking orders for them anymore.
Lytro pic of my x6500 miners: https://bitcointalksearch.org/topic/taking-lytro-pictures-of-my-fpgas-68115
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