Each card occupies both 6pin on the motherboard. Can the 5870 run with no AUX power? Can each 6pin on the motherboard be split into two, so both cards share the same 6pin (power)?
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5870 _AND_ RX 580 in a 2010 Mac Pro possible?
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You need pixlas mod or separate PS to run both of those. They need equivalent of 8-pin each. (2 6-pin = 1 8-pin).
Thanks for your pointer. I'll start looking into this pixlas thingy.
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Oh well... thanks.
A follow-up question: Will OSX (or applications) be able to take advantage of a pair of non-identical video cards?
The simple answer is YES. There is no GPU pair concept in macOS (no SLI / crossfire), but simply multi GPU. OSX can drive multiple GPU at the same time, even mix AMD with Nvidia still OK.
On the software side, it very depends on how the software written. However, in general, multi GPU can only be used for compute, but not graphics. No matter how many GPU installed, only the GPU that connect to the monitor will do the graphic part. Therefore, make sure you connect the monitor to the "correct" GPU.
Okay. Like the regular Davinci or those bitcoin mining software. I guess it won't benefit my regular usage much. Thanks!
No, only very little software can use multi GPU properly. And almost none of the normal daily regular usage can utilise that. If you has a RX580, then all you need should be just the RX580, the 5870 should be quite redundant in normal daily use.