Radeon HD 4870 Mac 

Released January, 2009
  • 750 MHz
  • 512 MB GDDR5

Features Key features of the Radeon HD 4870 Mac

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

Radeon HD 4870 Mac
108.8 GB/s
GeForce GT 120
16.13 GB/s
Radeon HD 5770 Mac
76.48 GB/s

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

Radeon HD 4870 Mac
12 GPixel/s
GeForce GT 120
5.9 GPixel/s
Radeon HD 5770 Mac
13.6 GPixel/s

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

Radeon HD 4870 Mac
30 GTexel/s
GeForce GT 120
11.81 GTexel/s
Radeon HD 5770 Mac
34 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4870 Mac
1,200 GFLOPS
GeForce GT 120
117.5 GFLOPS
Radeon HD 5770 Mac
1,360 GFLOPS

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

Radeon HD 4870 Mac

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

Radeon HD 4870 Mac

Specifications Full list of technical specs


GPU brand ATI
GPU name RV770
Market Desktop
Clock speed 750 MHz
Is dual GPU No
Reference card None

raw performance

Shading units 800
Texture mapping units 40
Render output processors 16
Compute units 10
Pixel rate 12 GPixel/s
Texture rate 30 GTexel/s
Floating-point performance 1,200 GFLOPS


Memory clock speed 850 MHz
Effective memory clock speed 3,400 MHz
Memory bus 256 bit
Memory 512 MB
Memory type GDDR5
Memory bandwidth 108.8 GB/s

noise and power

TDP 150W
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