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. 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. 4.1 RX 480 reference card PCI Express power limit violations.

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