Any info about the USB programming option? It would be a lot easier to upgrade the bitsream with USB.
Is there a bitsream inside the board when you ship or is it my job as a customer to load it with JTAG? That means I need to purchase a JTAG connector?
Topic: Cairnsmore1 - Quad XC6SLX150 Board - page 122. (Read 286370 times)
please use molex connector.
the pcie connector is very limited per psu.
What?the pcie connector is very limited per psu.
The "molex" connector (i.e. peripheral device connector) is only good for about 35 watts, if I remember correctly. The PCIe 6-pin connector is good for 150 watts, however.
Both wrong. Molexes are good for 60 watts 12v and 25 watts 5v. 6 pin PCI-E is good for 75 watts 12v, and 8 pin is 150 watts.
You're half right. Yes, they both have 3 12v lines, but the extra two grounds on the 8 pin plug signal that the wiring is lower gauge (ie, higher current) and that there is also sufficient grounding available. Putting 150w on a 6 pin PCI-E connector is a good way to fry shit.
It should also be noted that the wire gauge makes a big difference. Claiming that you can put 50W through the Molex connector may be true, with optimal wiring. But when you see power supplies with 5x molex all daisy chained on a single strand of 18AWG wire, putting 250W through a single strand of 18AWG is a BAD idea
(just saying)So people need to be aware of the connector limit, and the wiring limits, and PSU Rail limits, and so on. Looking at only one specific component is bound to start a fire.
(But yes you are correct, I'm simply pointing out that many people will read that and go "OH I can use this cheap chinese supply that says it's 600W and has 9 molex on a single strand, so I can run 450Watt through that strand for this rig running on my carpeted floor in my home" and expect not to burn their house down)
Also it should be said that while that's the rating for the connector, poorly made connectors which may not provide reliable contact are notorious for arcing inside the housing, and causing thermal damage (eventually resulting in a fire, melted parts at the least)
please use molex connector.
the pcie connector is very limited per psu.
What?the pcie connector is very limited per psu.
The "molex" connector (i.e. peripheral device connector) is only good for about 35 watts, if I remember correctly. The PCIe 6-pin connector is good for 150 watts, however.
Both wrong. Molexes are good for 60 watts 12v and 25 watts 5v. 6 pin PCI-E is good for 75 watts 12v, and 8 pin is 150 watts.
You're half right. Yes, they both have 3 12v lines, but the extra two grounds on the 8 pin plug signal that the wiring is lower gauge (ie, higher current) and that there is also sufficient grounding available. Putting 150w on a 6 pin PCI-E connector is a good way to fry shit.
Both of you have your point.
With the following guessings:
*one of this quad boards is over 60-65W (with fan/fans)
*PSU is "big" enough ie: AX850
*(with good stock cables) of enough gauge
Could we connect safely two boards to the same pci-e psu cable ( we use only 6 pines but they are nice "gauged") ?
Thank you.
Any estimate when these will be ready? I'm looking to start delving into building a small FPGA farm and may consider getting the BFL single if this project is going to be long delayed (keeping in mind that BFL's time to delivery is long as well).
please use molex connector.
the pcie connector is very limited per psu.
What?the pcie connector is very limited per psu.
The "molex" connector (i.e. peripheral device connector) is only good for about 35 watts, if I remember correctly. The PCIe 6-pin connector is good for 150 watts, however.
Both wrong. Molexes are good for 60 watts 12v and 25 watts 5v. 6 pin PCI-E is good for 75 watts 12v, and 8 pin is 150 watts.
You're half right. Yes, they both have 3 12v lines, but the extra two grounds on the 8 pin plug signal that the wiring is lower gauge (ie, higher current) and that there is also sufficient grounding available. Putting 150w on a 6 pin PCI-E connector is a good way to fry shit.
please use molex connector.
the pcie connector is very limited per psu.
What?the pcie connector is very limited per psu.
The "molex" connector (i.e. peripheral device connector) is only good for about 35 watts, if I remember correctly. The PCIe 6-pin connector is good for 150 watts, however.
Both wrong. Molexes are good for 60 watts 12v and 25 watts 5v. 6 pin PCI-E is good for 75 watts 12v, and 8 pin is 150 watts.
please use molex connector.
the pcie connector is very limited per psu.
What?the pcie connector is very limited per psu.
The "molex" connector (i.e. peripheral device connector) is only good for about 35 watts, if I remember correctly. The PCIe 6-pin connector is good for 150 watts, however.
Both wrong. Molexes are good for 60 watts 12v and 25 watts 5v. 6 pin PCI-E is good for 75 watts 12v, and 8 pin is 150 watts.
To pre order send an email to bitcoin AT enterpoint DOT co DOT uk with address and contact details.
Yohan
Yohan
You have pre-order mail
cheers
To pre order send an email to bitcoin AT enterpoint DOT co DOT uk with address and contact details.
Yohan
Yohan
How do we express interest in a preorder?
Payment will only asked for when the unit is more or less ready to ship. In reality what we will probably do is look how many boards go through test in any one day and ask the next set of people for the money at that point with the idea of packing those units the day after. The only exception to that will be the bypass that we are going to try and give everyone 1 unit on an early shipment.
As the list of people is getting very long we will probably have to freeze the list for the early ship offer very soon.
As said we are looking at Bitcoins but initially we will use our traditional payment methods which are bank transfer, PayPal, credit or debit cards.
Yohan
As the list of people is getting very long we will probably have to freeze the list for the early ship offer very soon.
As said we are looking at Bitcoins but initially we will use our traditional payment methods which are bank transfer, PayPal, credit or debit cards.
Yohan
It's an already existing company with already existing products, so my guess is the methods of payment they already support will be supported but they're examining if paying with bitcoins can be an extra option.
Quick question. Do we have to pay full price at once or what? Also can we start paying already?
thank you.
thank you.
I believe yohan has said that you won't be expected to pay for your pre-order until they are either close to ready, or ready to ship. But I assume at that point, payment in full will be required.
Also I don't believe it's possible to pay right now (they are still sorting out possible payment methods and such).
But I'm just speculating based on previous posts in this thread.
Quick question. Do we have to pay full price at once or what? Also can we start paying already?
thank you.
thank you.
Pre-order is still open but we may pause it for couple of days sometime this week whilst we take stock on a couple of the more minor components and whilst we see how many we can "grap" either from our other projects or find from the general components market.
For existing pre-orders there isn't a problem unless we are let down by one of our suppliers. The highest risks at the moment in this respect are the heatsinks and fans which there are other option albeit possibly not so good options compared to those we have selected.
For existing pre-orders there isn't a problem unless we are let down by one of our suppliers. The highest risks at the moment in this respect are the heatsinks and fans which there are other option albeit possibly not so good options compared to those we have selected.
Nice addition of PCI-E and temp sensors....
I'd pre-ordered one of your boards but after your enhanecements I would like to get 4 more. are pre-order still open??
Thank you. I think at the end I've found my EU zone "shop".
I'd pre-ordered one of your boards but after your enhanecements I would like to get 4 more. are pre-order still open??
Thank you. I think at the end I've found my EU zone "shop".
There 3 ways of puting 12V into this board. The first is a jack either 2.1mm or 2.5mm (TBD). There is hard disk drive connector (usually refered to as Molex) and there is also a PCIe (6way) graphics power which incidentially is also made by Molex.
It is also possible to use the disk drive connector as an output to power a second board when using the PCIe graphics as an input. I would not recommend more than 1 power chained this way except when they are the dual or single versions of Cairnsmore1.
Depending on who makes a disk drive connector, and the mating half, the contacts are rated between 5A and 10A. On 12V input that gives a range of 60-120W. We also have a possibility to run on a slightly higher voltage (to be confirmed) say 15V and power then scales 75-150W. It's the current that matters on these connectors.
On power supplies it may be worth considering a single rail industrial style power supply for racks. We are going to look at this and it may be a more cost efficient path for arrays of boards.
Yohan
It is also possible to use the disk drive connector as an output to power a second board when using the PCIe graphics as an input. I would not recommend more than 1 power chained this way except when they are the dual or single versions of Cairnsmore1.
Depending on who makes a disk drive connector, and the mating half, the contacts are rated between 5A and 10A. On 12V input that gives a range of 60-120W. We also have a possibility to run on a slightly higher voltage (to be confirmed) say 15V and power then scales 75-150W. It's the current that matters on these connectors.
On power supplies it may be worth considering a single rail industrial style power supply for racks. We are going to look at this and it may be a more cost efficient path for arrays of boards.
Yohan
please use molex connector.
the pcie connector is very limited per psu.
What?the pcie connector is very limited per psu.
The "molex" connector (i.e. peripheral device connector) is only good for about 35 watts, if I remember correctly. The PCIe 6-pin connector is good for 150 watts, however.
I guess he meant the number of PCIe6 connectors per PSU is limited, i.e. a somewhat standard one has maybe 1-2*PCIe6 but 8*Peripheral. You'd need to split the PCIe to power up to 4 Quads.
I'm pretty sure it has molex and a pcie connector it will use either one for power.
We will look at something more complex with Ethernet and a few other ideas but we won't do much on this for few weeks or a couple of months. We have lots of non-Bitcoin projects to keep on target as well.
In the short term we are going the other way and going to offer Cairnsmore with 1 or 2 FPGAs only as lower cost entry level system options. It's not quite modular but an option some people might like. I add some info on these in the next couple of days.
In the short term we are going the other way and going to offer Cairnsmore with 1 or 2 FPGAs only as lower cost entry level system options. It's not quite modular but an option some people might like. I add some info on these in the next couple of days.
Efficiency of most regulators varies with output current. At low currents they are usually poor. At high currents they lose some efficiency. That's copper conduction losses mainly. The best place to operate tends to mid capacity e.g. about 6A in out 12A circuit case.
I guess that's why many power supplies have their peak efficiency at 50% load? So you will be having oversized regulators then?I like how you can completely disable an individual device at the power regulator level without affecting the others. This is something I don't think I have seen on other boards, although it could be the case on BFL's Single. They have what appear to be 2 banks of 8 MOSFETs (One per FPGA).
Will the controller device that interfaces with USB also have the capabilities of running its own operating system? I guess there aren't plans for Ethernet on this board, but that might be something to consider in the future if others want it.
Jump to: