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Differences What are the advantages of each

Front view of Radeon HD 3870 X2

Reasons to consider the
ATi Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Significantly higher memory bandwidth 115.32 GB/s vs 22.18 GB/s Around 5.2x higher memory bandwidth
Higher pixel rate 26.4 GPixel/s vs 3.18 GPixel/s More than 8.2x higher pixel rate
Significantly more render output processors 32 vs 4 28 more render output processors
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
Better floating-point performance 1,056 GFLOPS vs 191 GFLOPS More than 5.5x better floating-point performance
Higher effective memory clock speed 1,802 MHz vs 1,386 MHz More than 30% higher effective memory clock speed
More shading units 640 vs 120 520 more shading units
Higher texture rate 26.4 GTexel/s vs 6.37 GTexel/s Around 4.2x higher texture rate
More texture mapping units 32 vs 8 24 more texture mapping units
Higher memory clock speed 901 MHz vs 693 MHz More than 30% higher memory clock speed
More compute units 8 vs 3 5 more compute units
Front view of Radeon HD 3750

Reasons to consider the
ATi Radeon HD 3750

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Significantly lower TDP 65W vs 165W 2.5x lower TDP

Features Key features of the Radeon HD 3870 X2  vs 3750 

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

Radeon HD 3870 X2
115.32 GB/s
Radeon HD 3750
22.18 GB/s

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

Radeon HD 3870 X2
26.4 GPixel/s
Radeon HD 3750
3.18 GPixel/s

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

Radeon HD 3870 X2
26.4 GTexel/s
Radeon HD 3750
6.37 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3870 X2
1,056 GFLOPS
Radeon HD 3750

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


Radeon HD 3870 X2  vs
GPU name R680 RV635
Market Desktop Desktop
Clock speed 825 MHz 796 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 640 120
Texture mapping units 32 8
Render output processors 32 4
Compute units 8 3
Pixel rate 26.4 GPixel/s 3.18 GPixel/s
Texture rate 26.4 GTexel/s 6.37 GTexel/s
Floating-point performance 1,056 GFLOPS 191 GFLOPS


Radeon HD 3870 X2  vs
Memory clock speed 901 MHz 693 MHz
Effective memory clock speed 1,802 MHz 1,386 MHz
Memory bus 512 bit 128 bit
Memory 1,024 MB 512 MB
Memory type GDDR3 GDDR3
Memory bandwidth 115.32 GB/s 22.18 GB/s

noise and power

TDP 165W 65W


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