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Differences What are the advantages of each

Front view of Radeon HD 8870

Reasons to consider the
AMD Radeon HD 8870

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Higher effective memory clock speed 6,000 MHz vs 4,800 MHz 25% higher effective memory clock speed
Higher memory bandwidth 192 GB/s vs 153.6 GB/s More than 25% higher memory bandwidth
Better floating-point performance 3,789 GFLOPS vs 2,560 GFLOPS Around 50% better floating-point performance
Higher texture rate 118.4 GTexel/s vs 80 GTexel/s Around 50% higher texture rate
More shading units 2,048 vs 1,280 768 more shading units
More texture mapping units 128 vs 80 48 more texture mapping units
More compute units 32 vs 20 12 more compute units
Higher memory clock speed 1,500 MHz vs 1,200 MHz 25% higher memory clock speed
Front view of Radeon HD 7870

Reasons to consider the
AMD Radeon HD 7870

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Slightly higher clock speed 1,000 MHz vs 925 MHz Around 10% higher clock speed

Features Key features of the Radeon HD 8870  vs 7870 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 8870
192 GB/s
Radeon HD 7870
153.6 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 8870
29.6 GPixel/s
Radeon HD 7870
32 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 8870
118.4 GTexel/s
Radeon HD 7870
80 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8870
3,789 GFLOPS
Radeon HD 7870
2,560 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

Specifications Full list of technical specs

gpu

Radeon HD 8870  vs
7870 
GPU brand AMD AMD
GPU name Hainan XT Pitcairn XT
Market Desktop Desktop
Clock speed 925 MHz 1,000 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 2,048 1,280
Texture mapping units 128 80
Render output processors 32 32
Compute units 32 20
Pixel rate 29.6 GPixel/s 32 GPixel/s
Texture rate 118.4 GTexel/s 80 GTexel/s
Floating-point performance 3,789 GFLOPS 2,560 GFLOPS

memory

Radeon HD 8870  vs
7870 
Memory clock speed 1,500 MHz 1,200 MHz
Effective memory clock speed 6,000 MHz 4,800 MHz
Memory bus 256 bit 256 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 192 GB/s 153.6 GB/s

noise and power

TDP 185W 175W

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