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