It appears as though AMD is readying a new Radeon RX 5300 XT graphics card, presumably based on its 7-nanometer Navi GPU architecture. The new offering would join the Radeon RX 5700 XT 50th Anniversary Edition, Radeon RX 5700 XT, and Radeon RX 5700 as a lower priced option, though specs and other details are in short supply right now.
While we do not have a bead on the full spec sheet, we are not totally clueless to the design, assuming a couple of HP documents are accurate. If they are, not only does the Radeon RX 5300 XT exist, but it will sport 4GB of GDDR5 memory.
The card and RAM memory allotment are both listed in a pair of online documents pertaining to a couple of upcoming HP desktops. They are listed as HP Desktop M01-F0017ng (PDF) and HP Pavilion Desktop TP01-0006ng (PDF). Apparently there are additional desktop configurations that reference the unannounced graphics card, though ComputerBase (which spotted the listings) only singled out those two.
Both of those desktops also appear in a retail product listings at Alternate.de. It shows the TP01-0006ng build selling for €899 (around $988 in US currency), with a Ryzen 7 3700X, 16GB of RAM, Radeon RX 5300 XT, and 512GB NVMe SSD. The M01-F0017ng, meanwhile, is listed at €699 (~$768) with a Ryzen 5 3400G, 8GB of RAM, Radeon RX 5700 XT, and 512GB SSD.
All of these listings also reference a new chpset: AMD Promontory B550A. Based on the nomenclature, this would be a mid-range offering, and presumably would expand outside the OEM sector and into the do-it-yourself (DIY) market. However, we will have to wait and see.
If the retail listings are accurate, we will see these new parts in early October.