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Suggestions - dmnd - 07-15-2012

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 Smile

RE: Suggestions - K9 - 07-15-2012


RE: Suggestions - Mem5 - 07-15-2012

Buy 4xhd7990 when available.

RE: Suggestions - dmnd - 07-15-2012

(07-15-2012, 08:44 AM)K9 Wrote: Here:

Thanks for the links, very helpful!

(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?

RE: Suggestions - atom - 07-15-2012

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

RE: Suggestions - forumhero - 07-16-2012

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.

RE: Suggestions - atom - 07-18-2012

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..