It certainly does matter whether you pay $180 for a card, can you sell it for $249 or $299. (And yeah, the values come from my magic hat).
If the yields are low, then of course it is benefitical to salvage some SP's, but I believe this is not the case. I doubt any SP's will be disabled, but HD5850 to use lower binned(cheaper) GDDR5 and lower binned RV870 core.
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