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A couple bits of hardware info.

MICRON CUSTOMERS BEGIN SAMPLING GDDR5X MEMORY CHIPS

http://hexus.net/business/news/components/91526-micron-customers-begin-sampling-gddr5x-memory-chips/

another source: http://hothardware.com/news/micron-sampling-gddr5x-memory-for-faster-next-gen-graphics-cards

Back in early Feb Micron wrote a blog post about its intermediary GDDR5 memory technology and how it would hit mass production by summer. At that time we heard that the first GDDR5X chips would start sampling in spring – and now, nicely on schedule, daffodils at the ready – spring has come.

The Hot Hardware team claim to have got word direct from Micron that it has indeed started sampling GDDR5X to its clients. No other source was linked, and I can't find any official mention of this milestone on the Micron site at the time of writing. The sampling stage is an important step and according to that report we probably won't hear anything else from Micron until GDDR5X memory packing graphics cards are launched as summer heats up.

As Micron is said to have both 8Gb (1GB) and 16Gb (2GB) densities available for partners to sample, these partners will be able to cobble 8GB and 16GB graphics cards, ready for summer. As time moves on HBM will largely take over graphics RAM duties in the AiB industry but there are rumours that Nvidia, at least, will kit-out some high-end and mid-high range graphics cards with GDDR5X for release this summer.

 

AMD POLARIS AND VEGA: DETAILS ABOUT THE GPUS WITH FIRST SHADER DETAILS

http://www.pcgameshardware.de/AMD-Polaris-Hardware-261587/News/Vega-Details-Shader-Ellesmere-Baffin-Greenland-1190310/

As the article is in german and I've used Google translator to read it, I won't post the article but the relevant info that comes from it.

All the info comes from the source code of the latest Linux drivers.

• Ellesmere is Polaris 10, comes with 8 32-bit memory controllers, so it's a 256bit card.
• Baffin is Polaris 11, comes with 4 32-bit memory controllers, so it's a 128bit card.
• Greenland will be Vega 10 and 11.

The memory controller of Polaris 10 and 11 cards is labeled as "8.1". The Tonga (R9 285, R9 380 -/X) memory controller is 8.0(GDDR5) and Fiji is 8.5(HBM). That would suggest that Polaris could use GDDR5X memory modules.

They have found that the ID of Polaris 10 is 67DF: C4, and that there is an entry in the benchmark database of SiSoftware with that ID that labels it as having 36 Compute Units with 2,304 shader units. That's between Tonga XT, R9 380X, with 2048 and Hawaii Pro, R9 290-R9 390, with 2560. But the chip in question could be a cropped version, so a 2,560 or 3,072 is still possible.

Lastly, the smaller Vega could have 4096 shader units, the same as Fiji, while the big Vega would be the new top dog.

Of course that doesn't take into account the architectural improvements.

Edit: Videocardz also has two similar stories

AMD confirms Polaris 10 is Ellesmere and Polaris 11 is Baffin  # AMD Polaris 10 GPU specifications leaked

And they also believe that this is a cut down version of Polaris 10 with only 36 CUs, with the full chip featuring 40 CUs and 2560 Stream Processors/Shader Units.