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Differences What are the advantages of each

Front view of Radeon HD 6850 X2

Reasons to consider the
Generic Radeon HD 6850 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much higher memory bandwidth 268.8 GB/s vs 128 GB/s More than 2x higher memory bandwidth
More memory 4,096 MB vs 1,024 MB 4x more memory
Better floating-point performance 3,072 GFLOPS vs 1,488 GFLOPS More than 2x better floating-point performance
Higher pixel rate 51.2 GPixel/s vs 24.8 GPixel/s More than 2x higher pixel rate
Significantly more render output processors 64 vs 32 Twice as many render output processors
Higher texture rate 76.8 GTexel/s vs 37.2 GTexel/s More than 2x higher texture rate
Significantly more shading units 1,920 vs 960 Twice as many shading units
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
More texture mapping units 96 vs 48 Twice as many texture mapping units
More compute units 24 vs 12 Twice as many compute units
Front view of Radeon HD 6850

Reasons to consider the
AMD Radeon HD 6850

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Significantly lower TDP 127W vs 254W 2x lower TDP

Features Key features of the Radeon HD 6850 X2  vs 6850 

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

Radeon HD 6850 X2
268.8 GB/s
Radeon HD 6850
128 GB/s

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

Radeon HD 6850 X2
51.2 GPixel/s
Radeon HD 6850
24.8 GPixel/s

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

Radeon HD 6850 X2
76.8 GTexel/s
Radeon HD 6850
37.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6850 X2
3,072 GFLOPS
Radeon HD 6850
1,488 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 X2  vs
6850 
GPU brand AMD AMD
GPU name Barts PRO Barts PRO
Market Desktop Desktop
Clock speed 800 MHz 775 MHz
Is dual GPU Yes No
Reference card AMD Radeon HD 6850 X2 800 MHz 4 GB None

raw performance

Shading units 1,920 960
Texture mapping units 96 48
Render output processors 64 32
Compute units 24 12
Pixel rate 51.2 GPixel/s 24.8 GPixel/s
Texture rate 76.8 GTexel/s 37.2 GTexel/s
Floating-point performance 3,072 GFLOPS 1,488 GFLOPS

memory

Radeon HD 6850 X2  vs
6850 
Memory clock speed 1,050 MHz 1,000 MHz
Effective memory clock speed 4,200 MHz 4,000 MHz
Memory bus 512 bit 256 bit
Memory 4,096 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 268.8 GB/s 128 GB/s

noise and power

TDP 254W 127W

Comments

Showing 1 comment.
just compare this way ati 6850 x2 ,and single "normal " ati 6850, first card was just to see,what i will get when i crossfire one of that card ,and good to know that dual gpu single card exist,that 6850x2 ,so i can compare using that card ,future performance of ati 6850 cross-fired to other single cards, big thanks! as i see perfect scaling,for what reason i choose single 6850 with intention that with time upgrade it with crossfire and double performance, really this model is close as much to really get double increase,really perfect scaling. Eh,smart buy from start.Second card now cost me less then half price i payed 1st one..hooray for crossfire upgrade! (not every model and every card in CS or SLI give perfect scaling,this one really boost double! good to know, thats comment are for...maybe that help someone to go for upgrade with crossfire with this model,as mine power supply have no problem for adding more 127w(peak, in full load, real is much less) to it..even will work more efficient with that increased power draw..
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