The sharp-eyed rumor hawks over at Videocardz have spotted listings at a couple of web shops for purported Radeon RX 580, RX 570, and RX 550 cards from Sapphire, MSI, and Asus. Both 4GB and 8GB memory capacities are represented for the RX 570 and RX 580, while the RX 550 appears to come in 2GB or 4GB varieties.
We've heard nary a peep about an upcoming Radeon refresh from official sources, but the existence of these cards isn't entirely surprising. With the looming launch of the Radeon RX Vega, system integrators and OEMs will likely want freshly-branded cards to use in lower-end products. Videocardz thinks the RX 570 and RX 580 are likely based on the same Polaris 10 GPU as the RX 470 and RX 480. The RX 550, on the other hand, is probably based on that rumored Polaris 12 GPU.
Notably missing from the leaks is an RX 460 analog, presumably to be called the RX 560. That might indicate that the rumored Polaris 12 is performing well enough that a supposed RX 560 became redundant, or it might point to another vendor chomping up AMD's supply of the petite and power-efficient Polaris.
There aren't a tremendous number of details about the new cards, unfortunately. Sapphire might be introducing a new "Pulse" branding, and that all of that company's Polaris 10-based cards will include two HDMI and two DisplayPort connections. There also appears to be a "Mini" model coming from Sapphire. MSI's cards follow the standard Gaming X nomenclature, while all of Asus' listed Polaris 10 offerings are ROG Strix models.
The listings at Videocardz show prices, but the site cautions readers not to panic at the high numbers since they're likely placeholders. These cards are purportedly expected to be in stock April 10, so if these listings are accurate, we don't have long to wait.