Suggestions

[dmnd]

Hello everyone,

Browsing the hardware forum, I have been unable to find a thread that suits my needs. I'm looking to build a machine -- which GPU should I purchase? How many should I purchase? 6900? 7970?

I'll spend $1500. Is this a good price point? I'm willing to spend up to $2000. What can I purchase with this? Is there anywhere I can receive information that lists the exact hardware to buy?

This machine will be used to crack MD5.

Thank you in advance

[K9]

Here:
http://golubev.com/gpuest.htm
http://www.gat3way.eu/est.php

[Mem5]

Buy 4xhd7990 when available.

[dmnd]

(07-15-2012 08:44 AM)K9 Wrote:  Here:
http://golubev.com/gpuest.htm
http://www.gat3way.eu/est.php

Thanks for the links, very helpful!

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(07-15-2012 10:08 AM)Mem5 Wrote:  Buy 4xhd7990 when available.

I was reading about 7990 before I posted the thread, hopefully they release it in august. With 4 of those, do you have a estimate at how many it can crack per second? I read in another thread on here that 2x7990 is ~35 billion hashes a second? Is that true?

[atom]

dual gpu cards clock lower, alot is depending on this. so it will be more like 30 billion/s on md5 with -lite.

[forumhero]

if they made desktop motherboards with 8 pcie slots than definitely 8xhd7970 than say 4xhd7990. not to mention you'd have to build a custom case using pcie raiser cables, multiple power supply, etc.. can get complicated. the biggest advantage with four dual gpu cards is that you can fit them in a standard full size ATX case using a single high wattage PSU without any customization. the trade off is it won't be as fast.

on a related note, i've been reading of bitcoin miners making the switch to FPGA from GPUs. mainly due to significant cost savings on power since they run their boxes 24/7. if you plan on a lot of hash cracking and will be running your computer 24/7, then perhaps it might be an option for you. of course you'd have to look for another app that support FPGA and the hash algorithm you want to crack.

[atom]

there is no such thing, for good reasons. it might work for simple incrementing generators as in SL3 or bitcoins but not like with complex stuff like rule-engines. this might change if they actually release an OpenCL runtimes like altera announced recently, but currently.. no..