- Sep 27, 2013
The rumours suggest a move to AMD but what are your guesses?
Well if I was ever going to buy a 5K iMac, I would want to edit 5K video as well as I edit 1080p video on my iMac, and as well as people edit 1440p video on their 27" iMac's. Until the price of this drops, mainly pro-users will want this and it needs to more than just eye candy.I do not expect a 5K iMac to have any more powerful GPU btw, experience shows that no substantial horsepower is needed for common desktop composing tasks. Memory bandwidth is more important!
This, no other mobile GPU is suitable for 5K display at this point. The new 900 series from Nvidia puts most AMD cards to shame in terms of performance per watt. There is no reason to go AMD at this point especially for machine like iMac. They need to keep it cool as possible and the best way to do it is by using less power.It has to be a 980M, nothing else will be acceptable.
There was a lot of buzz about the M295X this summer and then even after full specs were released, nothing more. As it's still unreleased, maybe this is why. I think this is the most plausible outcome. The M295X should be slightly more powerful than the GTX 880m, much cheaper than a 980m (which is still unreleased) and possibly tweaked to suit the retina iMac.AMD tonga R9 m295X. I guess they'll want to leverage OpenCL performance with 4k content on Adobe CC and FCPX.
What issues? Honest question, it's the first time I hear there are major issues with AMD mobile GPUs (recently, at least).To be honest if Apple did jump ship to AMD for the next refresh, I think I'd give it a miss until they re-adopt NVidia; there's just too many issues with AMD mobile cards and I don't want to go back there with heat etc as well.
there it is... http://wccftech.com/amd-20nm-r9-390x-feautres-20nm-hbm-9x-faster-than-gddr5/I'm not sure what AMD have planned for the future of their mobile graphics line, but I'm sure that it would have to be something pretty substantial in order to compete with NVIDIA's offerings.
Those are desktop graphics cards. It's unlikely that Apple will put desktop class graphics in the iMacs since they've never done it before, and the heat would be too much. Power consumption would also go up.
There really isn't much issue if you don't live in a CUDA world. Maxwell is great compared to last gen ATI but that's kinda the point new will of course be better than old. There are rumors of a die shrink for the for the 3xx ATI cards as well as stacked memory and if you combine that with Apple OpenCL or bust and the Mac Pro having ATI I'd imagine the odds of ATI in the new iMac are better than 50%. I think in general it's a wash either way whatever Apple chooses will be enough to do what they believe the typical work load is combined with their own projected SW optimizations.What issues? Honest question, it's the first time I hear there are major issues with AMD mobile GPUs (recently, at least).
The only benchmark we have for the 980m shows it about 21% behind the 780TI. Maybe 980m SLI is 10% behind the 980 but not the 980m. And after Apple underclocks it, the gap widens.i really hope for the 970M and BTO 980M
980M 2048 CUDA cores with 8 Gb vRAM
Nvidias mobile division has been slowly but surely catching up with its desktop counterparts as the generations and architectures progress. According to a slide by Nvidia, the 980 and 980M are only ~10% apart.
But the GTX 970 only needs around 140 watts - see a comparison here.Those are desktop graphics cards. It's unlikely that Apple will put desktop class graphics in the iMacs since they've never done it before, and the heat would be too much. Power consumption would also go up.