Comparison of Radeon R9 285 and Radeon R9 280X

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