Comparison of Radeon R9 285 and AMD Radeon HD

Attribute	Radeon R9 285 ×	AMD Radeon HD - FirePro D300 Compute Engine ×
GPU
Release year (year)	2014	2014
Reference card	AMD Radeon R9 285 918 MHz 2 GB	-
GPU brand	AMD	AMD
GPU name	Tonga	Pitcairn
Market	Desktop	-
Clock speed (MHz)	918	850
Turbo clock speed (MHz)	1,000	-
Is dual GPU	-	-
Model	Radeon R9 285	AMD Radeon HD - FirePro D300 Compute Engine
Memory
Memory (MB)	2,048	2,048
Memory bandwidth (GB/s)	176	162.6
Memory bus (bit)	256	256
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	1,375	1,270
Effective memory clock speed (MHz)	5,500	5,080
Noise and power
TDP (W)	190	150
Raw performance
Pixel rate (GPixel/s)	29.38	27.2
Render output processors	32	32
Texture mapping units	112	80
Shading units	1,792	1,280
Floating-point performance (GFLOPS)	3,290	2,176
Compute units	28	20
Texture rate (GTexel/s)	102.8	68
Benchmarks
FarCry 3	35	-
Particle simulation (mInteraction/s)	-	307
T-Rex (Compubench 1.5) (frames/s)	-	1
Video composition (frames/s)	-	70.69
Face detection (mPixels/s)	72.8	48.05
T-Rex (GFXBench 3.0)	3355.84	3351.76
Manhattan (GFXBench 3.0)	3715.04	3712.58
Bitcoin mining (mHash/s)	391.4	242.18
Sky Diver Factor	344.37	-
Fire Strike Factor	50.84	-
Ocean surface simulation (frames/s)	1474.63	1192.55