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Differences What are the advantages of each

Front view of Radeon HD 6850

Reasons to consider the
AMD Radeon HD 6850

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Significantly higher effective memory clock speed 4,000 MHz vs 1,400 MHz More than 2.8x higher effective memory clock speed
Higher clock speed 775 MHz vs 600 MHz Around 30% higher clock speed
Higher memory bandwidth 128 GB/s vs 22.4 GB/s Around 5.8x higher memory bandwidth
Higher pixel rate 24.8 GPixel/s vs 4.8 GPixel/s Around 5.2x higher pixel rate
Better floating-point performance 1,488 GFLOPS vs 384 GFLOPS Around 4x better floating-point performance
More render output processors 32 vs 8 24 more render output processors
More shading units 960 vs 320 Three times as many shading units
Higher memory clock speed 1,000 MHz vs 700 MHz Around 45% higher memory clock speed
More compute units 12 vs 4 Three times as many compute units
Front view of Radeon E4690 MXM

Reasons to consider the
ATi Radeon E4690 MXM

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Significantly lower TDP 30W vs 127W 4.2x lower TDP

Features Key features of the Radeon HD 6850  vs E4690 MXM 

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

Radeon HD 6850
128 GB/s
Radeon E4690 MXM
22.4 GB/s

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

Radeon HD 6850
24.8 GPixel/s
Radeon E4690 MXM
4.8 GPixel/s

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

Radeon HD 6850
37.2 GTexel/s
Radeon E4690 MXM
19.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6850
1,488 GFLOPS
Radeon E4690 MXM
384 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 6850  vs
E4690 MXM 
GPU brand AMD ATI
GPU name Barts PRO RV730
Market Desktop Laptop
Clock speed 775 MHz 600 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 320
Texture mapping units 48 32
Render output processors 32 8
Compute units 12 4
Pixel rate 24.8 GPixel/s 4.8 GPixel/s
Texture rate 37.2 GTexel/s 19.2 GTexel/s
Floating-point performance 1,488 GFLOPS 384 GFLOPS

memory

Radeon HD 6850  vs
E4690 MXM 
Memory clock speed 1,000 MHz 700 MHz
Effective memory clock speed 4,000 MHz 1,400 MHz
Memory bus 256 bit 128 bit
Memory 1,024 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 128 GB/s 22.4 GB/s

noise and power

TDP 127W 30W

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