Comparison of Radeon R9 285 and Radeon R9 280

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