Comparison of Radeon HD 7870 XT and Radeon R9 285

Attribute	Radeon R9 285 ×	Radeon HD 7870 XT ×
GPU
Release year (year)	2014	2012
Reference card	AMD Radeon R9 285 918 MHz 2 GB	-
GPU brand	AMD	AMD
GPU name	Tonga	Tahiti LE
Market	Desktop	Desktop
Clock speed (MHz)	918	925
Turbo clock speed (MHz)	1,000	975
Is dual GPU	-	-
Model	Radeon R9 285	Radeon HD 7870 XT
Memory
Memory (MB)	2,048	2,048
Memory bandwidth (GB/s)	176	192
Memory bus (bit)	256	256
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	1,375	1,500
Effective memory clock speed (MHz)	5,500	6,000
Noise and power
TDP (W)	190	185
Raw performance
Pixel rate (GPixel/s)	29.38	31.2
Render output processors	32	32
Texture mapping units	112	96
Shading units	1,792	1,536
Floating-point performance (GFLOPS)	3,290	2,995
Compute units	28	24
Texture rate (GTexel/s)	102.8	93.6
Benchmarks
Metro: Last Light	-	79.5
FarCry 3	35	-
Battlefield 3	-	72
Face detection (mPixels/s)	72.8	65.4
T-Rex (GFXBench 3.0)	3355.84	3350.68
Manhattan (GFXBench 3.0)	3715.04	3705.76
Bitcoin mining (mHash/s)	391.4	345.79
Sky Diver Factor	344.37	314
Fire Strike Factor	50.84	47.56
Ocean surface simulation (frames/s)	1474.63	-