Comparison of Radeon R9 285 and Radeon R9 280

Attribute	Radeon R9 285 ×	Radeon R9 280 ×
GPU
Release year (year)	2014	2014
Reference card	AMD Radeon R9 285 918 MHz 2 GB	-
GPU brand	AMD	AMD
GPU name	Tonga	Tahiti
Market	Desktop	Desktop
Clock speed (MHz)	918	827
Turbo clock speed (MHz)	1,000	933
Is dual GPU	-	-
Model	Radeon R9 285	Radeon R9 280
Memory
^1↑Memory (MB)	2,048	3,072
Memory bandwidth (GB/s)	176	240
Memory bus (bit)	256	384
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	1,375	1,250
Effective memory clock speed (MHz)	5,500	5,000
Noise and power
TDP (W)	190	200
Raw performance
Pixel rate (GPixel/s)	29.38	29.86
Render output processors	32	32
Texture mapping units	112	112
Shading units	1,792	1,792
Floating-point performance (GFLOPS)	3,290	3,344
Compute units	28	28
Texture rate (GTexel/s)	102.8	104.5
Benchmarks
FarCry 3	35	-
Dirt3	-	92
Face detection (mPixels/s)	72.8	80.47
T-Rex (GFXBench 3.0)	3355.84	3356.46
Manhattan (GFXBench 3.0)	3715.04	3713.26
Bitcoin mining (mHash/s)	391.4	365.38
Sky Diver Factor	344.37	336.33
Fire Strike Factor	50.84	55.14
Ocean surface simulation (frames/s)	1474.63	1687.03