[ANN] Bitfury is looking for alpha-testers of first chips! FREE MONEY HERE! - page 21.

ssi

member

Activity: 70

Merit: 10

Quote from: intron on September 04, 2013, 10:13:30 AM

Quote from: Tyger on September 04, 2013, 10:06:42 AM

Can someone confirm that ioref is not drawing any power, or if it is how much.

On the M-board, IOREF is connected with Vcore.
And Vcore should be a high Amp net anyways,
so current consumption of IOREF is not much of
a concern.

But there are no numbers on current consumption
as far as I know.

intron

What about Vddio consumption? I've been going overboard with current capacity on io, but it'd be nice to know the actual number.

ssi

member

Activity: 70

Merit: 10

Quote from: intron on September 04, 2013, 10:09:06 AM

Some binning of the ASICs before assembly
might be a good idea... Wink

intron

You get that binner spun yet? I'd love your layout if you're interested in making it public

intron

sr. member

Activity: 427

Merit: 251

- electronics design|embedded software|verilog -

Quote from: Tyger on September 04, 2013, 10:06:42 AM

Can someone confirm that ioref is not drawing any power, or if it is how much.

On the H-board, IOREF is connected with Vcore.
And Vcore should be a high Amp net anyways,
so current consumption of IOREF is not much of
a concern.

But there are no numbers on current consumption
as far as I know.

intron

intron

sr. member

Activity: 427

Merit: 251

- electronics design|embedded software|verilog -

Logged the hash rate of the sixteen individual
bitfurys on the S-HASH board:

Some binning of the ASICs before assembly
might be a good idea... Wink

intron

Tyger

full member

Activity: 141

Merit: 102

Can someone confirm that ioref is not drawing any power, or if it is how much.

ssi

member

Activity: 70

Merit: 10

Quote from: gingernuts on September 04, 2013, 02:34:09 AM

OK, so it sounds like everybody things internal clocks are the way to go - fair enough!

Does anyone know what the lead time is on single chips? I want to roll a board, but it probably doesn't make sense to fully populate it at 80E per chip - if the price really is being reviewed weekly, I'm half tempted to wait for the boards to come back from the fab before I pay for some samples...

The first batch of chips I ordered was shipped within 1 day. I've ordered two more batches since then, one order thursday, one order saturday, and neither has even been acknowledged yet.

gingernuts

member

Activity: 89

Merit: 10

OK, so it sounds like everybody things internal clocks are the way to go - fair enough!

Does anyone know what the lead time is on single chips? I want to roll a board, but it probably doesn't make sense to fully populate it at 80E per chip - if the price really is being reviewed weekly, I'm half tempted to wait for the boards to come back from the fab before I pay for some samples...

cscape

sr. member

Activity: 251

Merit: 250

The internal clock has some jitter, which reduces the setup/hold windows inside the chip. Theoretically, with a stable external clock you should be able to go a little bit faster. But is it worth the effort ? The internal clock has an advantage that you can tune it per chip.

BR0KK

hero member

Activity: 784

Merit: 500

Quote from: ssi on September 03, 2013, 05:33:26 PM

Quote from: Fiyasko on September 03, 2013, 05:06:54 PM

Hey just to clarify, Is ssi's design of what appears to be a pci-e 1x card with a backplane a pci card that you can stick into regular motherboards? Or is it a rack style "blade"

It's a blade... not going to work in a regular motherboard

There will be backplanes and chassis for them.

##

But it would make a nice pcie 1x card Tongue

Great work!

vs3

hero member

Activity: 622

Merit: 500

Quote from: ssi on September 03, 2013, 04:12:27 PM

Quote from: Gomeler on September 03, 2013, 03:28:57 PM

Quote from: gingernuts on September 03, 2013, 01:30:01 PM

Speaking of over-clocking, has anyone got a chip hashing with an external oscillator yet? If so, could you make it go faster than the internal oscillator would have been running at whatever core-voltage you're running?

I think bitfury had some results from externally driving the chips when he was first testing them for correctness? Would be interesting what fmax we could get out of the chips if we ignored power efficiency.

Power consumption goes up exponentially... I don't think you're going to get much beyond 3GH.

Bitfury had mentioned earlier that chips should be fine at up to about 270MHz. There were also reports of people getting 3.1-3.2GH/s with some tuning but that's the highest I've seen reported so far.

ssi

member

Activity: 70

Merit: 10

Quote from: Fiyasko on September 03, 2013, 05:06:54 PM

Hey just to clarify, Is ssi's design of what appears to be a pci-e 1x card with a backplane a pci card that you can stick into regular motherboards? Or is it a rack style "blade"

It's a blade... not going to work in a regular motherboard

There will be backplanes and chassis for them.

Gomeler

hero member

Activity: 697

Merit: 500

Quote from: ssi on September 03, 2013, 04:23:19 PM

Quote from: Gomeler on September 03, 2013, 04:21:25 PM

Quote from: ssi on September 03, 2013, 04:12:27 PM

Quote from: Gomeler on September 03, 2013, 03:28:57 PM

Quote from: gingernuts on September 03, 2013, 01:30:01 PM

Speaking of over-clocking, has anyone got a chip hashing with an external oscillator yet? If so, could you make it go faster than the internal oscillator would have been running at whatever core-voltage you're running?

I think bitfury had some results from externally driving the chips when he was first testing them for correctness? Would be interesting what fmax we could get out of the chips if we ignored power efficiency.

Power consumption goes up exponentially... I don't think you're going to get much beyond 3GH.

Exponentially with voltage, but linearly with frequency(at identical voltages), correct?

Yeah, that's correct. I'm not sure using an external clock alone is going to help that much. I'm definitely interested to see what folks come up with though!

I imagine, having no professional education on this, that the internal oscillator scales in frequency in a predictable manner. Might be linear, might be exponential, or some other function. I know bitfury showed results where at a certain voltage/frequency, the chip was returning enough errors that a lower frequency was resulting in more overall work. Perhaps the cores required more voltage at that point to be stable? Would have been really neat if the internal oscillator took in a separate Vcc pin so you could tweak each chip's oscillator and core voltage for ideal performance.

Bitfury's chips interest me greatly and make me sad I chose computer science instead of computer engineering while in school.. now I'm stuck reading up on CE/EE college websites at night while pretending I understand what I'm reading.

Fiyasko

legendary

Activity: 1428

Merit: 1001

Okey Dokey Lokey

Hey just to clarify, Is ssi's design of what appears to be a pci-e 1x card with a backplane a pci card that you can stick into regular motherboards? Or is it a rack style "blade"

ssi

member

Activity: 70

Merit: 10

Quote from: Gomeler on September 03, 2013, 04:21:25 PM

Quote from: ssi on September 03, 2013, 04:12:27 PM

Quote from: Gomeler on September 03, 2013, 03:28:57 PM

Quote from: gingernuts on September 03, 2013, 01:30:01 PM

Speaking of over-clocking, has anyone got a chip hashing with an external oscillator yet? If so, could you make it go faster than the internal oscillator would have been running at whatever core-voltage you're running?

I think bitfury had some results from externally driving the chips when he was first testing them for correctness? Would be interesting what fmax we could get out of the chips if we ignored power efficiency.

Power consumption goes up exponentially... I don't think you're going to get much beyond 3GH.

Exponentially with voltage, but linearly with frequency(at identical voltages), correct?

Yeah, that's correct. I'm not sure using an external clock alone is going to help that much. I'm definitely interested to see what folks come up with though!

Gomeler

hero member

Activity: 697

Merit: 500

Quote from: ssi on September 03, 2013, 04:12:27 PM

Quote from: Gomeler on September 03, 2013, 03:28:57 PM

Quote from: gingernuts on September 03, 2013, 01:30:01 PM

Speaking of over-clocking, has anyone got a chip hashing with an external oscillator yet? If so, could you make it go faster than the internal oscillator would have been running at whatever core-voltage you're running?

I think bitfury had some results from externally driving the chips when he was first testing them for correctness? Would be interesting what fmax we could get out of the chips if we ignored power efficiency.

Power consumption goes up exponentially... I don't think you're going to get much beyond 3GH.

Exponentially with voltage, but linearly with frequency(at identical voltages), correct?

ssi

member

Activity: 70

Merit: 10

Quote from: Gomeler on September 03, 2013, 03:28:57 PM

Quote from: gingernuts on September 03, 2013, 01:30:01 PM

Speaking of over-clocking, has anyone got a chip hashing with an external oscillator yet? If so, could you make it go faster than the internal oscillator would have been running at whatever core-voltage you're running?

I think bitfury had some results from externally driving the chips when he was first testing them for correctness? Would be interesting what fmax we could get out of the chips if we ignored power efficiency.

Power consumption goes up exponentially... I don't think you're going to get much beyond 3GH.

Gomeler

hero member

Activity: 697

Merit: 500

Quote from: gingernuts on September 03, 2013, 01:30:01 PM

Speaking of over-clocking, has anyone got a chip hashing with an external oscillator yet? If so, could you make it go faster than the internal oscillator would have been running at whatever core-voltage you're running?

I think bitfury had some results from externally driving the chips when he was first testing them for correctness? Would be interesting what fmax we could get out of the chips if we ignored power efficiency.

gingernuts

member

Activity: 89

Merit: 10

Speaking of over-clocking, has anyone got a chip hashing with an external oscillator yet? If so, could you make it go faster than the internal oscillator would have been running at whatever core-voltage you're running?

ssi

member

Activity: 70

Merit: 10

Quote from: Andreoid on September 03, 2013, 06:33:47 AM

Quote from: ssi on September 02, 2013, 10:33:37 PM

Designed to have a heatsink mounted to the back with airflow; I expect this sucker to require some cooling!

If you want to overclock them and expect to much heat, please feel welcome to contact us (anfi-tec) for some watercoolers.
Furthermore for a better packing density.

That might be a good option... I'd need a waterblock that's about 100x30mm.

gingernuts

member

Activity: 89

Merit: 10

Quote from: ssi on August 30, 2013, 04:29:27 PM

Quote from: gingernuts on August 30, 2013, 02:30:55 PM

In an SPI chain of chips, does the OUTMOSI go back to the host, or does the return data get routed back down the chain to INMISO?

The latter. output port of the final chip doesn't need to go anywhere.

Thanks.

Topic: [ANN] Bitfury is looking for alpha-testers of first chips! FREE MONEY HERE! - page 21. (Read 176728 times)