Mobility Radeon HD 4870 X2 

Released January, 2009
  • 550 MHz
  • 2 GB GDDR5

Features Key features of the Mobility Radeon HD 4870 X2

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

Mobility Radeon HD 4870 X2
179.2 GB/s
GeForce GT 720M
12.8 GB/s
GeForce GTX 280M
60.8 GB/s

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

Mobility Radeon HD 4870 X2
17.6 GPixel/s
GeForce GT 720M
2.5 GPixel/s
GeForce GTX 280M
9.36 GPixel/s

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

Mobility Radeon HD 4870 X2
44 GTexel/s
GeForce GT 720M
10 GTexel/s
GeForce GTX 280M
37.44 GTexel/s

floating point performance How fast the gpu can crunch numbers

Mobility Radeon HD 4870 X2
1,760 GFLOPS
GeForce GT 720M
240 GFLOPS
GeForce GTX 280M
374.5 GFLOPS

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

Mobility Radeon HD 4870 X2
1,600

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

Mobility Radeon HD 4870 X2
80

Specifications Full list of technical specs

gpu

GPU brand ATI
GPU name M98
Market Laptop
Clock speed 550 MHz
Is dual GPU Yes
Reference card None

raw performance

Shading units 1,600
Texture mapping units 80
Render output processors 32
Compute units 20
Pixel rate 17.6 GPixel/s
Texture rate 44 GTexel/s
Floating-point performance 1,760 GFLOPS

memory

Memory clock speed 700 MHz
Effective memory clock speed 2,800 MHz
Memory bus 512 bit
Memory 2,048 MB
Memory type GDDR5
Memory bandwidth 179.2 GB/s
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