New AMD Radeon 300 Series Are Rebrands

AMD's new OEM mobile Radeon M300 series and the OEM desktop Radeon 300 Series are actually based on existing GPUs and have subtle spec changes compared to previous offerings. That's a typical case for GPU manufacturers, since OEMs always want new parts to sell.

The OEM R9 series for desktops include the R9 380 OEM, Radeon R9 370 OEM and the Radeon R9 360 OEM.

AMD OEM Desktop Radeon R9 300 Series
	AMD Radeon HD R9 380 OEM (R9 285 variant)	AMD Radeon R9 370 OEM (R7 265 variant)	AMD Radeon R9 360 OEM (R9 260 variant)
Stream Processors	1792	1024	768
Texture Units	112	64	48
ROPs	32	32	16
Boost Clock	Up to 918MHz	Up to 975MHz	Up to 1050MHz
Memory Clock	5.5GHz GDDR5	5.6GHz GDDR5	6.5GHz GDDR5?
Memory Bus Width	256-bit	256-bit	128-bit
VRAM	Up to 4GB	2GB/4GB	2GB
Transistor Count	5.0B	2.8B	2.08B
GPU	Tonga	Pitcairn	Bonaire
Manufacturing Process	TSMC 28nm	TSMC 28nm	TSMC 28nm
Architecture	GCN 1.2	GCN 1.0	GCN 1.1

The R9 380 OEM appears to be a variant of the desktop R9 285, based on AMD's GPU. The quoted clockspeeds are identical to the retail R9 285.

The R9 370 OEM is a cut-down Pitcairn card, with 1024 of its 1280 SPs active. This makes it a variant of the retail R7 265, though with a slightly higher maximum GPU clockspeed. Based on the old GCN 1.0, it lacks functionality such as the ability to decode 4K H.264 video files, AMD?s improved power management technology, and support for AMD?s Freesync technology.

The R9 360 OEM appears to be a variant of the R9 260 OEM, featuring an AMD Bonaire GPU with only 768 of its 896 SPs enabled.

The R7 300 OEM series includes the R7 350 OEM and R7 340 OEM. Both are rebadges of AMD?s existing R7 250 OEM and R7 240 OEM parts, and both are based on the same GCN 1.0 Oland GPU. They feature 384 SPs.

AMD OEM Desktop Radeon R7 300 Series
	AMD Radeon HD R7 350 OEM (R7 250 variant)	AMD Radeon R7 340 OEM (R7 240 variant)
Stream Processors	384	384
Texture Units	24	24
ROPs	8	8
Boost Clock	Up to1050MHz	Up to 780Hz
Memory Clock	Up to4.5GHz GDDR5 DDR3	Up to 4.5GHz GDDR5 DDR3
Memory Bus Width	128-bit	128-bit
VRAM	1GB/2GB	1GB/2GB GDDR5 2GB/4GB DDR3
GPU	Oland	Oland
Manufacturing Process	TSMC 28nm	TSMC 28nm
Architecture	GCN 1.0	GCN 1.0

The R5 300 OEM series includes two Oland parts - the R5 340 OEM and the R5 330 OEM. These are low end, low-profile single slot graphics cards.

AMD OEM Desktop Radeon R5 300 Series
	AMD Radeon HD R5 340 OEM (R5 240 variant)	AMD Radeon R5 330 OEM (R5 240 variant)
Stream Processors	320	320
Texture Units	20	20
ROPs	8	8
Boost Clock	Up to 825MHz	Up to 855Hz
Memory Clock	Unknown GDDR5/DDR3	Unknown DDR3
Memory Bus Width	Unknown
VRAM	Up to 2GB GDDR5/DDR3	Up to 2GB DDR3
GPU	Oland	Oland
Manufacturing Process	TSMC 28nm	TSMC 28nm
Architecture	GCN 1.0	GCN 1.0

AMD's new mobile GPU is the Radeon M300 series includes the R9 M375, R7 M360 and R5 M330 parts. They are also rebadged verions of AMD's existing GCN 1.0 GPUs, possibly the AMD's M200 series.

AMD M300 Series GPU Specification Comparison
	R9 M375 (R9 M270/M260 variant)	R7 M360 (R7 M270/M260 variant)	R5 M330 (R5 M255 variant)
Stream Processors	640	384	320
Texture Units	40	24	20
ROPs	16	4?	4?
Boost Clock	Up to 1015MHz	Up to 1015MHz	Up to 1030MHz
Memory Clock	2.2GHz DDR3	2GHz DDR3	2GHz DDR3
Memory Bus Width	128-bit	64-bit	64-bit
VRAM	Up to 4GB	Up to 4GB	Up to 4GB
GPU	Cape Verde	Oland	Oland
Manufacturing Process	TSMC 28nm	TSMC 28nm	TSMC 28nm
Architecture	GCN 1.0	GCN 1.0	GCN 1.0

AMD has allowed OEMs to configure their offerings at clockspeeds higher than 1GHz. On the other hand, memory bandwidth has been limited. The M375 has a 128-bit memory bus while the other two parts are shipping with a 64-bit memory bus.

AMD says that the new mobile GPUs have dual graphics capabilities, so OEMs will most possibly pair them with Carrizo/Kaveri APUs to add more graphics horespower to their devices.