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Still, they'll be available when supporting software eventually ships. Fan Profiles and Throttling. Much has been written since the R9 290X. Normally i would recommend the latest version of display drivers, Crimson v. But, it has caused 'page fault in non-paged area' with the new atikmdag.sys file over and over. With both the initial and the Crimson 15.11.1 beta version. Reverting back to the older 15.7.1 display driver while still using the newer Crimson control software has worked perfect.

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I did some more digging and found out that R9 M380 is not very much different from R9 M390. Yes its in the shading units - 768 vs 1280, same as with the previous generation R9 M280 vs R9 M290. But both use the same type 2 Gb of GDDR5 memory.However, the tipping point between choosing which iMac model suits you best, could be the Fusion Drive thats also included in iMac model thats 200$ more expensive.And no, you cannot upgrade the graphics card yourself.Hope this helps. I'm also shopping for a new iMac and leaning towards the M390 version with the Fusion drive. For now, until further tests and reviews on graphic cards are done. At this time, there isn't much available detailed information and benchmarks on graphic performance of these GPUs. Sources for the specifications of these 2 cards are notebookcheck.net and amd official website - so I'm only drawing conclusions from the tech specs of these 2 cards.

There are no actual performance benchmark tests on these cards that I could find.Could be worth waiting around to see how people test them out first? I am going on a holiday next week myself so it would be at least 2 weeks before I make my own purchase, Id advise to wait a bit (if you can) so people can actually test out these 2 cards/machines. It seems I am a bit late, but you can take reference to the desktop counterparts.M380 has 640 shader cores per AMD's site, with up to 96GB/s of memory bandwidth from an 128-bit GDDR5 interface.

This means it should be more powerful than R7 250X and HD 7770 on theoretical spec, assuming that it doesn't throttle by the temperature.As for M390, AMD doesn't list such a part in their site, but judging by the spec of M385X and M390X, it has a high chance to be a rebrand of M290X (1280 shader cores + 256-bit GDDR5 I/F). R9 270X and HD 7870 are the desktop parts that have a similar spec, ignoring the effect of throttling. If the engine clock is significantly lowered than 1 GHz, you may take reference to the SKUs below them, i.e. R9 270/370 and HD 7850, instead.P.S.

I doubt you can upgrade yourself. They are likely soldered, or using MXM modules which are not in the retail market AFAIK.Now for performance numbers, computerbase's numbers showed that 270X outperformed 260X by around 50% at 1080p with 4xAA. On the other hand, toms hardware's numbers showed that 260X outperformed 250X by 20-30% at 1080p in various configurations. Manual minisplit york gz 12a e1. But after taking account of M380's (250X) possibly higher memory bandwidth it could be narrowed down to like 10-20%.So by connecting the dots, you can expect M390 could be 65-80% faster than M380, but only if M390 is an SKU of the chip with 1280 shader cores. Anyway, waiting for reviews would be better than betting on the spec.ref 1:ref 2:.