[Hardware] "success"

[Kris Amy]

Surely this would draw less power/result then my pc.

I get ~8.4million keys/sec and my pc draws 320W excluding monitors(but I
turn them off when I'm not using them).

That works out to be ~38watts/Mkey/sec.

Any ideas on the amount of power the fpga doing 55Mkey/sec would chew?

Cheers,
KA

-----Original Message-----
From: Dan Oetting [mailto:dan_oetting at qwest.net] 
Sent: Saturday, 21 October 2006 2:05 PM
To: Hardware
Subject: Re: [Hardware] "success"


On Oct 20, 2006, at 9:07 PM, Martin Klingensmith wrote:

> Well Kris,
> There are a lot of devices that can do it, dare I say just about any
> FPGA. But to do it fast you need a LOT of registers one way or  
> another -
> pipelined or paralleled.
> The algorithm I have nearly complete requires a device slightly larger
> than a Spartan 3 - 1.6 million "gates" device. It would only run at 55
> MHz but would run one key per clock cycle so it would theoretically do
> 55 million keys per second.
> This is just an estimate of course. Flame suit on..

Now, if you want a scary number, find the power requirement of this  
chip running at that clock speed. Then compute the required run time  
to crack RC5-72 on the device. And finally, multiply the product of  
those by the cost of electricity in your area.

-- Dan O.

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