Is a 6990 a good GPU crunching machine? or buy more recent?

[StitchExperimen]

Is a 6990 a good GPU crunching machine? or buy more recent?
Its got 3072 Stream Processors
but only @ 880MHz Engine Clock
5.40 TFLOPs Single Precision compute power o 1.37 TFLOPs Double Precision Compute Power
And it is ONLY Open CL 1.1
???

Thanks for your Knowledge and time
The other Bruce dropping in.

[Zagen30]

Core 17, which is where the major points are at GPU-wise, runs a lot better on the 7000 and R9/R7/R5 series than the 5000/6000 series (and much better on the 600/700 series for Nvidia vs. 400/500 series). I think each GPU would get around 40k PPD, for 80k total. Or maybe it's 20k per GPU/40k total; my quick google search turned up some conflicting reports. For comparison, a stock 7950 with the latest drivers should get more than my upper estimate.

[StitchExperimen]

Thanks!

[TheHiding]

I was running a 7950 and a 6850. 7950 is giving me about 85k per day. The 6850 was about 10k.
The 6850 was taking 30 hrs per WU.
7950 was 7.5 hrs per WU.

6850 was loud, so I pulled it out.