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Differences What are the advantages of each

Front view of Radeon HD 8760

Reasons to consider the
AMD Radeon HD 8760

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Significantly higher clock speed 1,000 MHz vs 775 MHz Around 30% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Higher effective memory clock speed 4,500 MHz vs 4,000 MHz Around 15% higher effective memory clock speed
Higher memory clock speed 1,125 MHz vs 1,000 MHz Around 15% higher memory clock speed
Lower TDP 80W vs 127W More than 35% lower TDP
Front view of Radeon HD 6850

Reasons to consider the
AMD Radeon HD 6850

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Higher memory bandwidth 128 GB/s vs 72 GB/s Around 80% higher memory bandwidth
Higher pixel rate 24.8 GPixel/s vs 16 GPixel/s More than 55% higher pixel rate
More render output processors 32 vs 16 Twice as many render output processors
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More shading units 960 vs 640 320 more shading units

Features Key features of the Radeon HD 8760  vs 6850 

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

Radeon HD 8760
72 GB/s
Radeon HD 6850
128 GB/s
Overclocking on our card worked well, the clock speeds we saw were in the typical range for a HD 6850 card.
Radeon HD 6850 | by techPowerUp! (Feb, 2011)

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

Radeon HD 8760
16 GPixel/s
Radeon HD 6850
24.8 GPixel/s
960 MHz is still quite impressive and results in a nice performance increase.
Radeon HD 6850 | by techPowerUp! (Feb, 2011)

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

Radeon HD 8760
40 GTexel/s
Radeon HD 6850
37.2 GTexel/s
CHiL CHL8214 is a modern high-end voltage voltage controller that supports full voltage control via I2C.
Radeon HD 6850 | by techPowerUp! (Feb, 2011)

floating point performance How fast the gpu can crunch numbers

Radeon HD 8760
1,280 GFLOPS
Radeon HD 6850
1,488 GFLOPS

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

Unfortunately neither HIS, nor AMD could provide help with getting the board fixed so I had to reconfigure the shaders on my own.
Radeon HD 6850 | by techPowerUp! (Oct, 2010)

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

Specifications Full list of technical specs

gpu

Radeon HD 8760  vs
6850 
GPU brand AMD AMD
GPU name Cape Verde XT Barts PRO
Market Desktop Desktop
Clock speed 1,000 MHz 775 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 640 960
Texture mapping units 40 48
Render output processors 16 32
Compute units 10 12
Pixel rate 16 GPixel/s 24.8 GPixel/s
Texture rate 40 GTexel/s 37.2 GTexel/s
Floating-point performance 1,280 GFLOPS 1,488 GFLOPS

memory

Radeon HD 8760  vs
6850 
Memory clock speed 1,125 MHz 1,000 MHz
Effective memory clock speed 4,500 MHz 4,000 MHz
Memory bus 128 bit 256 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 72 GB/s 128 GB/s

noise and power

TDP 80W 127W

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