Credit: Steve Mandel
AMD’s new Polaris graphics architecture ushers in a fourth-generation graphics core, unheard of power efficiency, and perhaps more importantly for the company, hope.
The company said Monday that Polaris will pack a mostly redesigned GPU including the new fourth-gen GCN cores, a new memory controller, new multimedia cores, and a new geometry processor. Perhaps more importantly, it’ll be just as fast as a comparable Nvidia part, while using a lot less power, the company said.
In a demo to the press, AMD showed off a PC with an early Polaris GPU running Star Wars Battlefield at 1920x1080 resolution at 60 fps and consuming just 86 watts. The exact same system outfitted with a GeForce GTX 950 consumed 140 watts. AMD used desktop parts to sub in for laptop parts as it didn’t have mobile components yet, but the chip will initially be aimed at laptops and more entry-level desktop graphics cards.
Polaris chips will support both HDMI 2.0a and DisplayPort 1.3. The new chips are also capable of encoding and decoding H.265 video up to 4K resolution. That’s it for details on the new GCN, other than high-level bullet points like “improved shader efficiency,” “memory compression,” “better instruction pre-fetch,” and such.
We do know Polaris chips won’t leverage AMD’s involvement with High Bandwidth Memory, instead relying on the more common GDDR5, or a variant of it called GDDR5+. AMD officials said that decision was based on the power and cost issues associated with HBM for a mobile part today, but reiterated that they believe in HBM and will continue to use it and future iterations of it.
Polaris, at least the initial ones, will be aimed at laptops and low-power consumption tasks. AMD said it should enable performance-levels in thin-and-light laptops that have been unheard of before. Microsoft’s Surface Book, for example, features a GeForce GTX 940M variant that’s fast compared to integrated graphics but is no speed king in discrete. In theory, one should be able to squeeze a Polaris chip into something as thin as the Surface Book. Polaris should also play well in small factor PCs.
Much of the power savings can be attributed to a new fabrication process. Both AMD and Nvidia have been stuck on 4-year-old 28nm process, but this year AMD will move to either Global Foundries’ 14nm or TSMC’s 16nm process. Both feature FinFETs, which allow for better control of power leakage while offering more performance.
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