Comparison of Radeon R9 285 and Radeon R9 280X

Attribute	Radeon R9 285 ×	Radeon R9 280X ×
GPU
Release year (year)	2014	2013
Reference card	AMD Radeon R9 285 918 MHz 2 GB	AMD Radeon R9 280X 850 MHz 3 GB
GPU brand	AMD	AMD
GPU name	Tonga	Tahiti
Market	Desktop	Desktop
Clock speed (MHz)	918	850
Turbo clock speed (MHz)	1,000	1,000
Is dual GPU	-	-
Model	Radeon R9 285	Radeon R9 280X
Memory
Memory (MB)	2,048	3,072
Memory bandwidth (GB/s)	176	288
Memory bus (bit)	256	384
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	1,375	1,500
Effective memory clock speed (MHz)	5,500	6,000
Noise and power
^1↑TDP (W)	190	250
Raw performance
Pixel rate (GPixel/s)	29.38	32
Render output processors	32	32
Texture mapping units	112	128
Shading units	1,792	2,048
Floating-point performance (GFLOPS)	3,290	4,096
Compute units	28	32
Texture rate (GTexel/s)	102.8	128
Benchmarks
FarCry 3	35	-
Battlefield 4	-	39.9
Face detection (mPixels/s)	72.8	95.62
T-Rex (GFXBench 3.0)	3355.84	3356.04
Manhattan (GFXBench 3.0)	3715.04	3709.16
Bitcoin mining (mHash/s)	391.4	468.39
Sky Diver Factor	344.37	380.99
Thief	-	33.6
Fire Strike Factor	50.84	62.73
Ocean surface simulation (frames/s)	1474.63	-