Radeon HD 4870 Mac 

Released January, 2009
  • 750 MHz
  • 512 MB GDDR5

The very much famous Michael Kukielka has released his Apple Mac Pro benchmark video.
by Shaikh-Rafia (Jan, 2014)
“The entry-level 21.5-inch iMac features a 2.7 GHz quad-core Intel Core i5 processor and new Iris Pro graphics for unprecedented levels of integrated graphics performance.
by Syed-Muhammad-Usman-Pirzada (Sep, 2013)

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
76.5 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
800

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

Radeon HD 4870 Mac
40

In The News From around the web

20
Feb

Apple Initiates Video Repair Program for 2011-2013 MacBook Pros

by Ryan Smith |
www.anandtech.com
Namely, while the iMac used its dGPU exclusively the MacBook Pros all used switchable graphics, which means that the MacBook Pros are often being driven by their iGPU rather than their dGPU.
While the 2011 iMac and MacBook Pros use different GPUs, both systems use GPUs from AMD’s Radeon HD 6000M series, with the iMac using the higher-end 6970M while the MacBook Pros used the 6490M, 6750M, and 6770M GPUs.
15
Oct

AMD will show up in iMac 27 and a few more

by Fuad Abazovic |
www.fudzilla.com
This is a significant win for AMD, but the real winner is Intel since most Apple notebooks will continue using integrated Intel HD or Iris graphics.
We are not sure what Nvidia did to upset Apple, but this round of devices will be powered either by Intel integrated graphics or AMD discrete graphics.
20
Jan

More GPU failures on MacBook Pros

by Nick Farrell |
www.fudzilla.com
To make matters worse, MacBook Pro owners are also seeing frequent reboots to a gray screen.
Some Apple users are starting to mutter heresy about design flaws which cause heating problems.
6
Jan

Apple Mac Pro: Teardown Images and Detailed Benchmarks

by Shaikh Rafia |
wccftech.com
Non-proprietary Torx screws are used throughout, and several components can be replaced independently.
The very much famous Michael Kukielka has released his Apple Mac Pro benchmark video.

Specifications Full list of technical specs

gpu

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

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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