Bitcoin Forum
December 04, 2016, 12:04:06 AM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: « 1 2 3 4 5 6 7 8 9 10 [11] 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 ... 129 »
  Print  
Author Topic: Cairnsmore1 - Quad XC6SLX150 Board  (Read 251128 times)
DiabloD3
Legendary
*
Offline Offline

Activity: 1162


DiabloMiner author


View Profile WWW
May 11, 2012, 08:19:35 PM
 #201

Quote
... Again, I just said you can get a 0.5C/W or lower heatsink if you go large or loud enough....
But no one wants to do that Wink The whole idea about FPGAs is that they are smaller, cooler, less noiser than GPUs. Even if you achieve 2.7C/W top power draw shouldn't be more than 17W, commercial grade chips, 25W industrial grade chips at 25C ambient temp. Compared to 40W of one chip in BFL Single is damn small value. And we have to remember that propagation delays thru silicon raises when temperature raise. More power draw, faster MHz limit = less MH/s. There is somwhere a sweet spot and it's defenitevely below 17W thanks to high Rthjc... Are we agreed?

Yes, definitely. I wouldn't want to get nearly that close to the limit. That being said, if someone like eldentyrell releases a bitstream that does 250MH/s on an LX150 but pushes power consumption up to 15W, there are options out there that might be worthwhile to deal with that. Smiley

Thats up from 200 mhash, right? I wonder how many of these boards should have been equipped with big copper heatsinks instead.

1480809846
Hero Member
*
Offline Offline

Posts: 1480809846

View Profile Personal Message (Offline)

Ignore
1480809846
Reply with quote  #2

1480809846
Report to moderator
1480809846
Hero Member
*
Offline Offline

Posts: 1480809846

View Profile Personal Message (Offline)

Ignore
1480809846
Reply with quote  #2

1480809846
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1480809846
Hero Member
*
Offline Offline

Posts: 1480809846

View Profile Personal Message (Offline)

Ignore
1480809846
Reply with quote  #2

1480809846
Report to moderator
1480809846
Hero Member
*
Offline Offline

Posts: 1480809846

View Profile Personal Message (Offline)

Ignore
1480809846
Reply with quote  #2

1480809846
Report to moderator
1480809846
Hero Member
*
Offline Offline

Posts: 1480809846

View Profile Personal Message (Offline)

Ignore
1480809846
Reply with quote  #2

1480809846
Report to moderator
rjk
Sr. Member
****
Offline Offline

Activity: 420


1ngldh


View Profile
May 11, 2012, 09:08:43 PM
 #202

Quote
... Again, I just said you can get a 0.5C/W or lower heatsink if you go large or loud enough....
But no one wants to do that Wink The whole idea about FPGAs is that they are smaller, cooler, less noiser than GPUs. Even if you achieve 2.7C/W top power draw shouldn't be more than 17W, commercial grade chips, 25W industrial grade chips at 25C ambient temp. Compared to 40W of one chip in BFL Single is damn small value. And we have to remember that propagation delays thru silicon raises when temperature raise. More power draw, faster MHz limit = less MH/s. There is somwhere a sweet spot and it's defenitevely below 17W thanks to high Rthjc... Are we agreed?

Yes, definitely. I wouldn't want to get nearly that close to the limit. That being said, if someone like eldentyrell releases a bitstream that does 250MH/s on an LX150 but pushes power consumption up to 15W, there are options out there that might be worthwhile to deal with that. Smiley

Thats up from 200 mhash, right? I wonder how many of these boards should have been equipped with big copper heatsinks instead.
Watercool that shit.

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
ice_chill
Sr. Member
****
Offline Offline

Activity: 336


View Profile
May 11, 2012, 09:36:22 PM
 #203

lol are you guys serious water cool 15watts ? and the chip runs at 1.2v ? A passive heatsink with 120mm fan pushing air across will be enough.
MrTeal
Legendary
*
Offline Offline

Activity: 1246


View Profile
May 11, 2012, 09:39:38 PM
 #204

lol are you guys serious water cool 15watts ? and the chip runs at 1.2v ? A passive heatsink with 120mm fan pushing air across will be enough.

If a fan is pushing air across it, how is it passive? Smiley
TheHarbinger
Sr. Member
****
Offline Offline

Activity: 378


Why is it so damn hot in here?


View Profile
May 11, 2012, 09:44:34 PM
 #205

lol are you guys serious water cool 15watts ? and the chip runs at 1.2v ? A passive heatsink with 120mm fan pushing air across will be enough.

Yes, they are serious.  But not as serious as me.  Four Peltiers, then the heatsinks, then the watercoolers, all submerged in mineral oil, sealed into a 55 gallon metal drum, sunk down into Challenger Deep.  I figure I can get about a half a TH/s from each core.

12Um6jfDE7q6crm1s6tSksMvda8s1hZ3Vj
ice_chill
Sr. Member
****
Offline Offline

Activity: 336


View Profile
May 11, 2012, 09:51:17 PM
 #206

lol are you guys serious water cool 15watts ? and the chip runs at 1.2v ? A passive heatsink with 120mm fan pushing air across will be enough.

If a fan is pushing air across it, how is it passive? Smiley

I meant a case fan in the enclosure, but not a fan on the heatsink, a bit like we get passive PC video card, but still need a casefan to have the air moving.
MrTeal
Legendary
*
Offline Offline

Activity: 1246


View Profile
May 11, 2012, 09:53:08 PM
 #207

lol are you guys serious water cool 15watts ? and the chip runs at 1.2v ? A passive heatsink with 120mm fan pushing air across will be enough.

If a fan is pushing air across it, how is it passive? Smiley

I meant a case fan in the enclosure, but not a fan on the heatsink, a bit like we get passive PC video card, but still need a casefan to have the air moving.
That's not passive then if you're relying on a fan to move air. Convection should be enough. Wink
Gomeler
Hero Member
*****
Offline Offline

Activity: 635



View Profile
May 11, 2012, 09:54:51 PM
 #208

lol are you guys serious water cool 15watts ? and the chip runs at 1.2v ? A passive heatsink with 120mm fan pushing air across will be enough.

I'm seriously considering watercooling these. It depends on if a faster bitstream is released that could be thermally limited by the small heatsinks we're using on these FPGAs. If I can get another 15-30% by watercooling and keeping the core temps low then I'm all for it.

Glasswalker
Sr. Member
****
Offline Offline

Activity: 350



View Profile WWW
May 12, 2012, 12:25:15 AM
 #209

lol are you guys serious water cool 15watts ? and the chip runs at 1.2v ? A passive heatsink with 120mm fan pushing air across will be enough.

While generally yes a heat sink and fan will do fine. The reason alternatives are being considered with such a low wattage is because the FPGA package has such a poor thermal conductivity. It is a plastic chip package not a nice metal heat spreader like on gpu/CPU. So the chip core will always be quite a bit warmer than the package surface. Especially at higher power dissipation.

High heat can also impact performance and bit coin mining is already pushing these chips much harder than most other Applications do.

Anyway either way yes a normal heat sink with a fan or very good case airflow should be fine.

Send from my android phone. Please excuse typos and brevity.

Just trying to make Bitcoin a Success... One crazy project at a time. (13rwPKskyATcAq3PpnCikfFG8989DQ8M3c)
HashVoodoo Open Source FPGA Mining Bitstream: https://github.com/pmumby/hashvoodoo-fpga-bitcoin-miner
yohan
Sr. Member
****
Offline Offline

Activity: 448



View Profile
May 13, 2012, 10:04:30 AM
 #210

Dual and single versions pricing now released. Shipping from July. Seperate thread running for these versions https://bitcointalk.org/index.php?topic=81569.0 .

Yohan
Turbor
Legendary
*
Offline Offline

Activity: 1008


BitMinter


View Profile WWW
May 13, 2012, 11:15:12 AM
 #211

Dual and single versions pricing now released. Shipping from July. Seperate thread running for these versions https://bitcointalk.org/index.php?topic=81569.0 .

Yohan

Yohan, what will be the price for the quad for non preorders ?

pieppiep
Sr. Member
****
Offline Offline

Activity: 402



View Profile
May 13, 2012, 11:23:31 AM
 #212

Dual and single versions pricing now released. Shipping from July. Seperate thread running for these versions https://bitcointalk.org/index.php?topic=81569.0 .

Yohan

Yohan, what will be the price for the quad for non preorders ?
In the opening post : "After we complete the benchmarking/software work the price will increase by 50% to cover our costs in doing this work and general support."
So £600/$960/780€
Turbor
Legendary
*
Offline Offline

Activity: 1008


BitMinter


View Profile WWW
May 13, 2012, 12:06:51 PM
 #213

Dual and single versions pricing now released. Shipping from July. Seperate thread running for these versions https://bitcointalk.org/index.php?topic=81569.0 .

Yohan

Yohan, what will be the price for the quad for non preorders ?
In the opening post : "After we complete the benchmarking/software work the price will increase by 50% to cover our costs in doing this work and general support."
So £600/$960/780€

Thanks Wink

yohan
Sr. Member
****
Offline Offline

Activity: 448



View Profile
May 13, 2012, 02:36:41 PM
 #214

Currently quad is still at the offer price of GBP £400/ US $640 / 520€. Delivery is currently quoted at July but July capacity is going rapidly.
yohan
Sr. Member
****
Offline Offline

Activity: 448



View Profile
May 15, 2012, 06:02:11 AM
 #215

Schedule update

We are maintaining our schedule for production and whilst we can never rule out a problem occuring that changes this schedule, e.g. like a PCB manufacture issue, we should ship between 20-50 units in May. We will be asking payment from some of you next week.

The first week of June should see more of you get units.

The second week of June there will be few shipments partly because we are waiting for heatsinks but also the major public holidays that are in the first week of June will limit assembly output from that week which forms basis of shipment in the second week.

Week3 of June will see shipping pickup substantially once next batch of heatisnks arrive.

Yohan
Garr255
Legendary
*
Offline Offline

Activity: 952


What's a GPU?


View Profile
May 15, 2012, 06:09:03 AM
 #216

PM sent on behalf of Cognitive. Smiley

“First they ignore you, then they laugh at you, then they fight you, then you win.”  -- Mahatma Gandhi

Average time between signing on to bitcointalk: Two weeks. Please don't expect responses any faster than that!
punin
Hero Member
*****
Offline Offline

Activity: 559


View Profile WWW
May 15, 2012, 09:11:57 AM
 #217

Yohan, I think it would be a good idea for you to work together with nelisky (https://bitcointalk.org/index.php?action=profile;u=601) and ckolivas (https://bitcointalk.org/index.php?action=profile;u=19971) early on to provide CGMiner (https://bitcointalk.org/index.php?topic=28402.msg357369#msg357369) support for your boards. There already is Icarus support in CGMiner, so it shouldn't be too hard. Looking forward to getting your boards soon!

Head of Product Development
Bitfury Group
www.bitfury.com
allinvain
Legendary
*
Offline Offline

Activity: 1988



View Profile
May 15, 2012, 09:17:51 AM
 #218

Or MPBM Smiley Since MPBM already has good Icarus support I'd imagine this board should work pretty much the same if you use the Icarus bitstream.


Bitinvestor
Sr. Member
****
Offline Offline

Activity: 465


View Profile
May 15, 2012, 11:54:05 AM
 #219

Yohan, I think it would be a good idea for you to work together with nelisky (https://bitcointalk.org/index.php?action=profile;u=601) and ckolivas (https://bitcointalk.org/index.php?action=profile;u=19971) early on to provide CGMiner (https://bitcointalk.org/index.php?topic=28402.msg357369#msg357369) support for your boards. There already is Icarus support in CGMiner, so it shouldn't be too hard. Looking forward to getting your boards soon!

I second that!

Those who cause problems for others also cause problems for themselves.
yohan
Sr. Member
****
Offline Offline

Activity: 448



View Profile
May 15, 2012, 03:37:51 PM
 #220

We will be looking at this side over the next few weeks to determine who to talk to and what to do.

Do remember we are still going through a very big learning process and the hardware is only now coming in decent numbers. The hardware design and manufacturing side is something we are very good at but don't confuse that with it being simple. It takes an awful lot of people time and others resources to run such a large, rapid volume ramp, build like we are doing with Cairnsmore1 and keep it on schedule.

Yohan
Pages: « 1 2 3 4 5 6 7 8 9 10 [11] 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 ... 129 »
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!