Very interesting. It’s slightly odd that the 670 is releasing before the 680, but this may add some credibility to an iMac update this month.
Apple and AMD have a very tight relationship, and it’s not unheard of for a computer giant like Apple or Dell to demand full dies at launch. I could see a deal being made where Apple has exclusive rights for the 680 until November.
Trying not to get my hopes up, but a 9900K and Radeon Pro 680 would be a very welcome spec bump!
The Pro 670 is a cheaper part (I am guessing it would be just a Pro 680 that could not validate all 2304 cores, but does validate 2048), so getting it out the door is easier while production ramps up to full speed and AMD gets better yields for the Pro/RX 680 parts.
Yes, Apple could demand full dies at launch, but I suspect they are going to have more trouble with getting enough 9700K and 9900K deliveries (9600K part is essentially an iteration of the 8600K, so I expect it will be in decent, if not plentiful, supply). I am also wondering if Intel will have any trouble supplying enough Z390 chipsets, as it a 14nm part as well.
If and when Apple releases an updated iMac, anyone who is serious and not looking to just kick tires, may want to order one as soon as they can...I suspect that deliveries will start slipping quickly into 2019. Of course, Apple's wisest course of action would be to hold the update until Q1 2019, so there is always that possibility.