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Differences What are the advantages of each

Front view of Radeon HD 7970M

Reasons to consider the
AMD Radeon HD 7970M

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Higher memory bandwidth 153.6 GB/s vs 96 GB/s 60% higher memory bandwidth
Better floating-point performance 2,176 GFLOPS vs 1,536 GFLOPS More than 40% better floating-point performance
Higher pixel rate 27.2 GPixel/s vs 16 GPixel/s 70% higher pixel rate
More render output processors 32 vs 16 Twice as many render output processors
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
Higher texture rate 68 GTexel/s vs 48 GTexel/s More than 40% higher texture rate
More shading units 1,280 vs 768 512 more shading units
More texture mapping units 80 vs 48 32 more texture mapping units
More compute units 20 vs 12 8 more compute units
Front view of Radeon E8870

Reasons to consider the
AMD Radeon E8870

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Higher clock speed 1,000 MHz vs 850 MHz Around 20% higher clock speed
More memory 4,096 MB vs 2,048 MB 2x more memory
Higher effective memory clock speed 6,000 MHz vs 4,800 MHz 25% higher effective memory clock speed
Higher memory clock speed 1,500 MHz vs 1,200 MHz 25% higher memory clock speed
Lower TDP 75W vs 100W 25% lower TDP

Features Key features of the Radeon HD 7970M  vs E8870 

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

Radeon HD 7970M
153.6 GB/s
Radeon E8870
96 GB/s

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

Radeon HD 7970M
27.2 GPixel/s
Radeon E8870
16 GPixel/s

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

Radeon HD 7970M
68 GTexel/s
Radeon E8870
48 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7970M
2,176 GFLOPS
Radeon E8870
1,536 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 7970M  vs
E8870 
GPU brand AMD AMD
GPU name Wimbledon Saturn
Market Laptop Laptop
Clock speed 850 MHz 1,000 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,280 768
Texture mapping units 80 48
Render output processors 32 16
Compute units 20 12
Pixel rate 27.2 GPixel/s 16 GPixel/s
Texture rate 68 GTexel/s 48 GTexel/s
Floating-point performance 2,176 GFLOPS 1,536 GFLOPS

memory

Radeon HD 7970M  vs
E8870 
Memory clock speed 1,200 MHz 1,500 MHz
Effective memory clock speed 4,800 MHz 6,000 MHz
Memory bus 256 bit 128 bit
Memory 2,048 MB 4,096 MB
Memory type GDDR5 GDDR5
Memory bandwidth 153.6 GB/s 96 GB/s

noise and power

TDP 100W 75W

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