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I already ordered a Mac Pro with D700 and it ships for February. I don't think anyone really got their hands on one Mac Pro yet, usually it ships first to cities in the US and I'm in NYC. I'll post hash rates as soon as this Mac comes to my desk.
You can expect a very low hash rate compared to the original AMD FirePro W9000 because these cards in the cylinder are underclocked (over-heating I guess) from factory and even if you could (somehow) unlock it for overclocking I WILL NOT even dare to change the clock and memory speed.
If you had the original AMD W9000, overclocked, you could expect a STABLE +1000Kh/s with 2048 stream processors and 6GB memory.
The R9 290 has 2560 stream processors for 860Kh/s stable and the 290X has 2816 streams processors for 940 Kh/s stable, both with 4GB memory each.
So the new Mac Pro has a DUAL, UNDERCLOCKED W9000 so instead of getting +2000Kh/s I'm expecting something under 1,500Kh/s IF THERE IS NOW HEATING ISSUES. If there are heating issues then I could probably get something just over 1000Kh/s.
You are not going to buy this Mac just for mining BUT it can definitively help you pay off some of the initial costs over a 12-month period. I bought it for Graphics and Video work and to show my wife that I'm still the man in the house... :-) And I'll sell my current i7 Intel 16GB memory 27" iMac to help pay for the new cylinder and monitor.
I built a windows mining rig with $3,500 with three R9s, one 7950 and one 7850. The 7850 and 7950 was a mistake, I should have gotten 4 R9s. My hashrate is just under 4,000Kh/s.
I hope this helps,
Alejandro
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