R9 380 (Older R9 285) for build?
#1
Question 
I'm building a VM focused Linux rig on a budget that has to do occasional GPU number crunching and have been looking at the R9 380 as a mid range card.  XFX do a 2Gb DD Black Edition (1030Mhz) for £150.

I have some slight concerns that I'm hoping you guys could shed some light on. 

I'm happy with the benchmarks for the 380, but I am thinking that putting it in to practice on a 120 hour+ crack will be quite different given rising temperatures and the potential for AMD's PowerTune to interfere.  I don't want to spring for the card if I'm going to be forced down to 100KH/S WPA.

Does anybody have any practical experience with this card?  What is it actually like over extended periods?

Are there better recommendations for the price bracket?
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#2
There's really no good reason to use an AMD GPU in a new build. Should be able to find a GTX 970 for around the same price.
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#3
(09-07-2015, 09:03 AM)epixoip Wrote: There's really no good reason to use an AMD GPU in a new build. Should be able to find a GTX 970 for around the same price.

Thanks for your input, I'm in the UK and the 970's are going for £100+ on the R9 380's. Comparable prices here are the GTX 960 but according to this: http://gpuboss.com/gpus/Radeon-R9-380-vs...ce-GTX-960 FLOPS and Shaders aren't even close to a 380 with a stock clock speed of 918Mhz.

If I understand correctly, the price/performance of the R9 380 is very good on paper.

What would you say are bad reasons to consider purchasing one?
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#4
They are different architectures so you cannot directly compare the number of shaders. For example, the GTX 970 has 1664 cores and capable of 3.5 TFLOPS, while the R9 290X has 2816 cores and capable of 5.6 TFLOPS. Yet for password cracking their speeds are nearly identical.

GTX 960 should pull around 110 KH/s on WPA while drawing ~ 110W of power.

Also keep in mind the R9 380 is an old card, it's just a re-branded HD 7950. So if that's the card you want, you can probably pick of a pair of used 7950s for the same price as one R9 380.
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#5
I'm not fussed on which card I want per se, my criterea is basically thus:

Must be able to crack 8 char singlecase alpha within 8 days
Must be £150 or less
TDP isn't really a factor for me, very willing to overlook if it has the potential to knock a day or more of the brute speed of a single hash.

I'll do some more digging
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#6
(09-07-2015, 01:47 PM)Bishop Wrote: Must be £150 or less

You care about cost.

(09-07-2015, 01:47 PM)Bishop Wrote: TDP isn't really a factor for me

You don't care about cost.

Just sayin'
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#7
(09-07-2015, 02:27 PM)rico Wrote:
(09-07-2015, 01:47 PM)Bishop Wrote: Must be £150 or less

You care about cost.

(09-07-2015, 01:47 PM)Bishop Wrote: TDP isn't really a factor for me

You don't care about cost.

Just sayin'

As I said in the OP, cracking will be infrequent so an ATI card might cost an extra £10 over the course of a year which is neither here nor there.  The quickest time at 8 days or less is what is most important to me as the machine will be basically unusable whilst hashcat is busy, which I don't like Smile
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#8
Fair enough so.

(09-07-2015, 03:09 PM)Bishop Wrote: the machine will be basically unusable whilst hashcat is busy, which I don't like Smile

FYI, you can play around with the -n and -u parameters to make the screen less/more responsive (with a hash rate trade off). You can absolutely use the machine whilst cracking.

If performance is ultimate then scratch using the screen though Smile
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