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Author Topic: 750 KH using 5mW?  (Read 1337 times)
P4man
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November 17, 2011, 08:48:14 AM
 #1

Edit: got it wrong by a few orders of magnitude. Corrected.

These guys have built a test chip essentially for testing SHA-3, but they also included an SHA 2 core:
http://rijndael.ece.vt.edu/sha3/sha3chip.html

The chip is just 5mm2 using standard cells 130nm process, the SHA2 core is only a tiny percentage of that. Now look at the data sheet:

http://rijndael.ece.vt.edu/sha3/chip/sha3-asic-datasheet.pdf

Scroll down to page 14. For 512 bit blocks it says throughput is 1.51 Gbps @200 Mhz . Next page reveals a power consumption of 5mW.

So we are looking at 0.75 MH/s for 5mW ?

Scale that up and you get 750MH for 5W and still have a chip thats pretty damn small.

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2112
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November 17, 2011, 07:23:06 PM
 #2

Can you write down your arithmetic that computed 750kH/s? Do you assume same chips looping data back to itself or a pair of chips working as a pipeline?

I see a design with 200MHz clock, 16-bit wide streaming data input/output and 68 cycles of latency. 512-bit width of block shouldn't matter, this is an internal detail. From my place I can't get the #1 citation in this paper: "A hardware interface for Hashing Algorithms".

Please comment, critique, criticize or ridicule BIP 2112: https://bitcointalk.org/index.php?topic=54382.0
Long-term mining prognosis: https://bitcointalk.org/index.php?topic=91101.0
P4man
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November 17, 2011, 07:31:23 PM
 #3

I uploaded it to google docs, hopefully you can access that:
https://docs.google.com/document/d/1l7nHZr4OeXZZwt9xbbDovmIv4q9RtM3X6tFsRWv4q5w/edit

Then Ill let you provide the correct arithmetic Smiley

P4man
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November 17, 2011, 11:20:56 PM
 #4

Its a research chip to compare various SHA3 implementations, its not a commercial product. Its also not an FPGA, but an asic. But if you want,  "Free SHA-3 sample chips are available upon request. ". Go right ahead and start mining at 5mW Smiley

DeathAndTaxes
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November 17, 2011, 11:26:49 PM
 #5

Scroll down to page 14. For 512 bit blocks it says throughput is 1.51 Gbps @200 Mhz . Next page reveals a power consumption of 5mW.
So we are looking at 0.75 MH/s for 5mW ?
Scale that up and you get 750MH for 5W and still have a chip thats pretty damn small.

Actually I think it is 1.5MH/s @ 5mW.

Right?

1.51 Gbps = 1510Mbps / 512 bits per clock = 2.95MB/s.  Bitcoin megahash is actually 2 SHA-256 hashes (2 blocks) so 2.95/2 ~= 1.5MH/s @ 5mW.

1.5MH/s / 0.005W = ~300 MH/W.
deslok
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November 18, 2011, 01:32:38 AM
 #6

Its a research chip to compare various SHA3 implementations, its not a commercial product. Its also not an FPGA, but an asic. But if you want,  "Free SHA-3 sample chips are available upon request. ". Go right ahead and start mining at 5mW Smiley

i wonder how many sapmles we're allowed

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