scrypt requires a memory bank, doesnt it? where is that going to come from for this design? every other scrypt asic has talked about the need for high-end DDR5 memory, and lots of it
It's on the chip.
Topic: Gridseed GC3355 -Hybrid Scrypt/SHA256 ASIC - page 18. (Read 107972 times)
It's on the chip.
scrypt requires a memory bank, doesnt it? where is that going to come from for this design? every other scrypt asic has talked about the need for high-end DDR5 memory, and lots of it
Interested as well.
Samples?
Board design contest?
Keen to roll out a prototype 24 x GC3355 Wasp.
Board design contest?
Keen to roll out a prototype 24 x GC3355 Wasp.
Sign me up
Samples?
Board design contest?
Keen to roll out a prototype 24 x GC3355 Wasp.
Board design contest?
Keen to roll out a prototype 24 x GC3355 Wasp.
I guess this one will be the first but there are more (interesting ones) coming
https://litecointalk.org/index.php?topic=2702.msg68596#msg68596
That would be around 75W for the same result with the GC3355 plus some pocketchange in btc
https://litecointalk.org/index.php?topic=2702.msg68596#msg68596
Quote
My understanding of that GPU is ~750khs per card. Which runs about 300$. Energy consumption, by massive amount yes. Price will be based on kh per unit. We will be selling @ 0.90$ per khs (Which we have achieved in relation to profitability.) As for kh/s, easily and with only a single unit. Our conservative numbers are 960kh/s with 3.5 watts consumption. I would say we have beaten its numbers pretty thoroughly.
That would be around 75W for the same result with the GC3355 plus some pocketchange in btc
Deffo gotta get my hands on some of this gear, should be an interesting little thing.
works. in english
http://www.gridseed.com/main.php
http://www.gridseed.com/main.php
Any one know more about this chip?
specs are here
https://github.com/gridseed/gc3355-doc/blob/master/GC3355_DataSheet.pdf
And holy shit, it claims to do 59.6 KH/s while using 0.44 W
This is 0.00738 W/KH/s versus 0.300 W/KH/s for a GPU -- a 40.7 fold increase in efficiency. This is about the same increase in efficiency as compared to BTC when ASICMINER first introduced its chips; I'm curious to see how they did it.
electricity efficiency is awesome. put me in for 10 units.
the domain is still not ready.
Works for me:
http://www.gridseed.com/
Any one know more about this chip?
specs are here
https://github.com/gridseed/gc3355-doc/blob/master/GC3355_DataSheet.pdf
And holy shit, it claims to do 59.6 KH/s while using 0.44 W
This is 0.00738 W/KH/s versus 0.300 W/KH/s for a GPU -- a 40.7 fold increase in efficiency. This is about the same increase in efficiency as compared to BTC when ASICMINER first introduced its chips; I'm curious to see how they did it.
electricity efficiency is awesome. put me in for 10 units.
the domain is still not ready.
If these are cheap and people can run a lot of chips at once then this could be a game changer. I want a few hundred myself. lol.
the price of dev boards and chips so far is not cheap, but not fixed. they will sell at the price people will pay for shovels, supply&demand..next machine contains ~208 chip for total ~12/mhs scrypt and 330g sha256 or 450g sha256 and 8mh/s scrypt depending on mode
How much?
If these are cheap and people can run a lot of chips at once then this could be a game changer. I want a few hundred myself. lol.
the price of dev boards and chips so far is not cheap, but not fixed. they will sell at the price people will pay for shovels, supply&demand..next machine contains ~208 chip for total ~12/mhs scrypt and 330g sha256 or 450g sha256 and 8mh/s scrypt depending on mode
If these are cheap and people can run a lot of chips at once then this could be a game changer. I want a few hundred myself. lol.
Not long at all. Probably all ready hashing. Just need to refine the software would be my guess .
.
I wonder how much these will cost and how long it will take to get them into a working machine. Any theories?
Scrypt requires high speed access to memory so I'm gonna say this is bull until there is some evidence it works. 
its demonstrated already..
I find it interesting the similarities between this chip and the Avalon gen2 chip.
Even the pin outs are similar
Even the pin outs are similar
avalon gen2 is designed by this team
Not too shabby if these only cost about $5-10 each to produce on 55 nm QFN-48.
it's not QFN-48 and cost less than 1$
It is possible to do scrypt with a fpga, so that implies asic is possible too. I have seen a POC. With that said I am extremely skeptical if it can hit above 60k/s rate. Let alone even 10k/s scrypt hashing rate.
My FPGA is hashing at 60Kh/s, granted, it's a 5000$ fpga, but it is possible.
Litecoin will work fine on asic with on-die sram. You can even calculate the hash rate based on known factors.
Code:
200 / (2048 * 8) * Ncores = scrypt hashrate in Mh/s based on 200Mhz clock speed
It appears what they've done to keep the chip small is to implement 4x 256Kbit on-die memories for hashing as I haven't seen anything mentioned about an off chip memory. At 55nm 1mbit of sram is about 7.63mm2. At 28nm 1mbit of sram is 3.88mm2. The max size for QFN-48 (which is a 7x7mm package) silicon is around 4x4mm so have roughly 16mm2 of space. They couldn't have implemented 4x 1mbit as it would be to large (with an exception for the 28nm which would be 15.52mm2, but even then there wouldn't be enough room for all those bitcoin hashers). The speed and stats are certainly within the realm of possibility.
Looks like their site is up. Didn't work the first time.
55nm chip, so definitely within the realm of possibility.
Hey senseless, which code are you using for LTC? Thanks a lot
I find it interesting the similarities between this chip and the Avalon gen2 chip.
Even the pin outs are similar
That's just them being cautious. If we're familiar with the pinout, it's easier for us to design a board to support it.Even the pin outs are similar
I really want to get my hands on a chip to develop. It's kinda painful how difficult it is to get dev samples of new chips these days.
I find it interesting the similarities between this chip and the Avalon gen2 chip.
Even the pin outs are similar
Even the pin outs are similar
It appears what they've done to keep the chip small is to implement 4x 256Kbit on-die memories for hashing as I haven't seen anything mentioned about an off chip memory. At 55nm 1mbit of sram is about 7.63mm2. At 28nm 1mbit of sram is 3.88mm2. The max size for QFN-48 (which is a 7x7mm package) silicon is around 4x4mm so have roughly 16mm2 of space. They couldn't have implemented 4x 1mbit as it would be to large (with an exception for the 28nm which would be 15.52mm2, but even then there wouldn't be enough room for all those bitcoin hashers). The speed and stats are certainly within the realm of possibility.
Looks like their site is up. Didn't work the first time.
55nm chip, so definitely within the realm of possibility.
Looks like their site is up. Didn't work the first time.
55nm chip, so definitely within the realm of possibility.
That's interesting. If they did implement the SRAM on chip, I guess the could maximally fit 14 scratchpads (14 x 128 KB). If with 8 they could reach 84 KH/s at let's say a theoretical 0.750 W, we'd max out on a single chip at 147 KH/s and 1.3 W. Not too shabby if these only cost about $5-10 each to produce on 55 nm QFN-48.
I'd guess they aren't using straight up scratch pads, though, but rather the TMTO desynchronization trick from Solar Designer. Regardless, the physical limitations as above should still be the same.
On second look, they are using QFN-64 not QFN-48 so they do have some extra wiggle room and may have even been able to do 4x 512Kbit scratchpads.
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