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Topic: Gridseed GC3355 -Hybrid Scrypt/SHA256 ASIC - page 19. (Read 107971 times)

legendary
Activity: 1484
Merit: 1005
December 09, 2013, 11:19:53 PM
#33
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.

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.
member
Activity: 85
Merit: 10
December 09, 2013, 10:40:14 PM
#32
Anyone try to sign up for the Weibo feed?
hero member
Activity: 1118
Merit: 541
December 09, 2013, 10:00:18 PM
#31

Translated auto-reply from sales address:

Quote
Important Note: We currently do not have any place in the pre-sale, Taobao are fake, the official website information please prevail.

Follow weibo.com/gridseed That is our official microblogging.

Relating to the purchase, agents, price issues,
Please wait for our official website www.gridseed.com announced
If you need to apply the agent, please specify in the message header "application proxy" and described their own information, and other advantages, if only one sentence is difficult to our attention that, thank you.

For technical discussion, please www.cybtc.com gridchip zone discussion, where maintenance by our technical team.

Documents to download, go to the open source project: github.com/gridseed

If we are unable to respond to you request, please understand, because the volume of mail than we expected, but we will read every message.

I found more pictures on some chinese site:
http://www.cybtc.com/thread-3005-1-1.html




legendary
Activity: 1484
Merit: 1005
December 09, 2013, 09:47:24 PM
#30
Scrypt requires high speed access to memory so I'm gonna say this is bull until there is some evidence it works.  Wink

I'm sure someone will reverse engineer these sooner rather than later, and then we'll be looking at a lot of potential scrypt ASICs hitting the market.  SEMs aren't that costly these days.
hero member
Activity: 1118
Merit: 541
December 09, 2013, 09:43:44 PM
#29
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.







hero member
Activity: 490
Merit: 500
December 09, 2013, 09:33:59 PM
#28
Scrypt requires high speed access to memory so I'm gonna say this is bull until there is some evidence it works.  Wink
legendary
Activity: 1554
Merit: 1222
brb keeping up with the Kardashians
December 09, 2013, 09:17:53 PM
#27
When will they be available and how can I buy one?
Sy
legendary
Activity: 1484
Merit: 1003
Bounty Detective
December 09, 2013, 07:32:21 AM
#26
Yeah but i bet they don't even think about it, its alot of work to put 1 million chips into working devices - why even bother if you can just sell them at much higher instant profit  Grin just sayin, that would only double the current diff, raising the ltc diff to 10k and above is not an easy task xD
Sy
legendary
Activity: 1484
Merit: 1003
Bounty Detective
December 09, 2013, 06:53:54 AM
#25
Power efficiency is nice but the number doesn't change that much, you need 10 chips (600$?) to outmatch a 280x (300$?), yes power is the key but this is not "a game changer" just a shift in power consumption, the kh numbers are pretty much the same.
Du(al)-Coin mode up to 1.75G/s BTC Hash Rate + 60K/s LTC Hash Rate, or up to 2.25G/s BTC Hash
Rate + 38K LTC Hash Rate


comes with 1.75GH/s of BTC hash rate as well..when running 60Kh/S LTC, doubt one 280x can do that? Grin

Yep that's a neat feature, doesn't concern the ltc network at all though, ppl react like this will really hit the ltc network hard but in fact, it doesn't change much at all, availability will suck as usual - you need 1,058,750 chips to just double the current diff and bring it up to 4200...

Don't get me wrong, i'll most likely buy some of these since it's really really nice to have but it won't change things as much as most here tend to think.
newbie
Activity: 24
Merit: 0
December 09, 2013, 06:47:59 AM
#24
Power efficiency is nice but the number doesn't change that much, you need 10 chips (600$?) to outmatch a 280x (300$?), yes power is the key but this is not "a game changer" just a shift in power consumption, the kh numbers are pretty much the same.
Du(al)-Coin mode up to 1.75G/s BTC Hash Rate + 60K/s LTC Hash Rate, or up to 2.25G/s BTC Hash
Rate + 38K LTC Hash Rate


comes with 1.75GH/s of BTC hash rate as well..when running 60Kh/S LTC, doubt one 280x can do that? Grin
Sy
legendary
Activity: 1484
Merit: 1003
Bounty Detective
December 09, 2013, 06:28:30 AM
#23
Power efficiency is nice but the number doesn't change that much, you need 10 chips (600$?) to outmatch a 280x (300$?), yes power is the key but this is not "a game changer" just a shift in power consumption, the kh numbers are pretty much the same.
full member
Activity: 191
Merit: 110
December 09, 2013, 03:48:17 AM
#22
You lost me at LTC.  When you say 60K/s.. does that equate the same to 60KH/s?
hero member
Activity: 924
Merit: 1000
December 09, 2013, 01:55:45 AM
#21
Quote
1 GENERAL DESCRIPTION
GC3355 is high performance and low power SHA256 processor designed by GRIDCHIP. With
advanced technology and highly integrated design, GC3355 target to provide multiple function and low
cost solution in SHA256 application fields.
 
Key feature:
 160 BTC Units
 4 LTC Units
 BTC mode up to 2.25G/s BTC Hash Rate, with 2.4W/GHash
 LTC mode up to 60K/s LTC Hash Rate
 Due-Coin mode up to 1.75G/s BTC Hash Rate + 60K/s LTC Hash Rate, or up to 2.25G/s BTC Hash
Rate + 38K LTC Hash Rate
 Highly integrated with PLL and Pre-Calculation Engine
 Support dual configuration and report interface, UART and Custom-Defined 2-Wires Bus
 Support Crystal and Oscillator
 Fully adjustable clock frequency





http://gridseed.com
https://github.com/gridseed/gc3355-doc
https://github.com/gridseed/cpuminer
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.
sr. member
Activity: 406
Merit: 250
December 09, 2013, 01:21:04 AM
#20
getting very interesting. Smiley
legendary
Activity: 1792
Merit: 1047
December 09, 2013, 01:16:09 AM
#19
Chips and dev boards for now

Pictures confirm the release event and functionality.  One person was able to get a single chip to hash at 84 KH/s.

This could be a game changer.. at least as hardware is concerned.
sr. member
Activity: 378
Merit: 250
December 08, 2013, 11:43:43 PM
#18
hi

so who is producing it?
legendary
Activity: 1484
Merit: 1005
December 08, 2013, 08:45:23 PM
#17
Chips and dev boards for now

Pictures confirm the release event and functionality.  One person was able to get a single chip to hash at 84 KH/s.
legendary
Activity: 1121
Merit: 1003
December 08, 2013, 07:13:22 PM
#16
just chips or a miner?
hero member
Activity: 504
Merit: 500
December 08, 2013, 07:11:28 PM
#15
Very interesting !

LTC & BTC chips...i buy !  Grin
full member
Activity: 168
Merit: 100
December 08, 2013, 06:38:51 PM
#14
First chips are getting into developer hands today.

http://www.cybtc.com/thread-3226-1-1.html
google translate:
Code:
Scheduled at 10:00 on December 8, 2013, in West Street, Haidian, Beijing, 70 3W coffee (Haidian Book City, south of the membership across the sea floor), held Gridchip GC3355 chip product launches and mining machines. In addition to the chip and mine-site machine product launches, and BTC, LTC demonstration outside mining, but also on-site sales of 50 sets of single-chip development board and a few chips.

Development board: each 500 yuan
chip: 400 yuan per piece, per pack of 1600 yuan four chips

This price is only preliminary offers developers, not as a formal reference to the product price. Each person can purchase two development boards, chip purchase of two packs per person.

$65 a chip for the early pieces.
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