AMD has quietly launched a new range of graphics cards designed for OEMs and system builders that fall under Radeon 300 series branding. Like with the HD 8000 series a couple of years ago, these cards are essentially all rebrands of existing Radeon 200 series products, and won't be available through retail channels.

The highest end OEM product is the Radeon R9 380, the very same graphics card seen in HP's latest Envy desktops that we speculated could be a next-generation GPU. Unfortunately this isn't the case, as the R9 380 is a basic rebrand of the R9 285 from AMD's current range of graphics cards.

The rest of the OEM range are rebrands of either R7 or R5 series cards, the oldest of which is the R9 370 that uses a Pitcairn GPU first introduced in the Radeon HD 7850 released in early 2012.

Radeon 300 Series OEM Card Previously Known As Changes
Radeon R9 380 Radeon R9 285 VRAM increase from 2 GB to 4 GB
Radeon R9 370 Radeon R7 265 Clock speed increase from 925 MHz to 975 MHz
New 4 GB variant
Radeon R9 360 Radeon R7 260 Clock speed increase from 1000 MHz to 1050 MHz
VRAM increase from 1 GB to 2 GB
VRAM bandwidth increase from 96 GB/s to 104 GB/s
Radeon R7 350 Radeon R7 250 No change
Radeon R7 340 Radeon R7 240 New 1 GB GDDR5 and 4 GB DDR3 variants
Radeon R5 340 Radeon R5 240 Clock speed increase from 780 MHz to 825 MHz
Radeon R5 330 Radeon R5 240 Clock speed increase from 780 MHz to 855 MHz
No GDDR5 variant

As you can see from the table above, many of the rebranded cards have received minor spec upgrades, though performance shouldn't differ hugely from their predecessors. However not all of the cards support the same features: the R9 380 and R9 360 are the only cards not based on AMD's older GCN 1.0 architecture, meaning they're the only cards to support FreeSync, TrueAudio, and CrossFire without a bridge.

There's the possibility that AMD will release these GPUs to the retail market virtually unchanged from the OEM versions. It's unlikely that the company would release a retail R9 380, for example, with a different set of specifications, so any new GPUs from AMD will almost certainly be released under different names.

And as for those new graphics cards, AMD is gearing up to launch a selection of flagship GPUs this quarter, complete with High Bandwidth Memory. Computex is just around the corner, so expect to see these new GPUs in early June.

Also read: AMD Radeon R9 390X variant will come water-cooled with High Bandwidth Memory