According to AMD, their prime target with the design of Polaris was energy efficiency: Polaris 10 was initially planned to be a mid-range chip, to be featured in the RX 480, with a TDP of around 110-135W compared to its predecessor R9 380's 190W TDP. The GPU replaces the mid-range Tonga segment of the Radeon M300 line. Polaris 10 features 2304 stream processors across 36 Compute Units (CUs), and supports up to 8GB of GDDR5 memory on a 256-bit memory interface.
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On 8 December 2016, AMD released Crimson ReLive drivers (Version 16.12.1), which make GCN-GPUs support VP9 decode acceleration up to and twinned with support for Dolby Vision and HDR10. It includes new hardware schedulers, a new primitive discard accelerator, a new display controller, and an updated UVD that can decode HEVC at 4K resolutions at 60 frames per second with 10 bits per color channel. This series is based on the fourth generation GCN architecture. Vulkan 1.2 requires GCN 2nd gen or higher with the Adrenalin 20.1 and Linux Mesa 20.0 drivers and newer. Vulkan (API) ĪPI Vulkan 1.0 is supported for all GCN architecture cards.
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Any OpenCL 2.0 conformant card can gain OpenCL 2.1 and 2.2 support with only a driver update. OpenCL 2.0 is supported with GCN 2nd gen. OpenCL 1.0 to 1.2 are supported for all chips with Terascale or GCN architectures.
OpenCL allows use of GPUs for highly parallel numeric computation accelerates many scientific software packages against CPU up to factor 10 or 100 and more. Therefore, for example, the RX 460 indicates that it has at least 1.5 teraflops of performance, 100 GB/s of memory throughput, has a 128-bit memory bus and will be able to achieve 60 FPS in the previously mentioned games at 1080p. Finally, the third numeral will indicate whether the card is in its first or second revision with either a 0 or 5, respectively. The highest tier, tier 9, will feature a memory bus greater than 256-bit and shall be aimed at 4K gaming. Tiers 7 and 8 will each have a 256-bit memory bus and will be marketed as 1440p cards.
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Tiers 5 and 6 will have both RX prefixed and non-RX prefixed cards, indicating that while they will both feature a 128-bit memory bus and be targeted at 1080p gaming, the latter will fall short 1.5 teraflops of performance. Tier 4, the weakest tier in the 400 series, will lack the RX prefix and feature a 64-bit memory bus. Like previous generations, the first numeral in the number refers to the generation (4 in this case) and the second numeral in the number refers to the tier of the card, of which there are six. The RX prefix is used for cards that offer over 1.5 teraflops of performance and 80 GB/s of memory throughput (with memory compression), and achieve at least 60 FPS at 1080p in popular games such as Dota 2 and League of Legends.