AMD Radeon HD 7850M vs ATI Radeon HD 4870 Mac Edition

Table of Contents

Graphics Processor

GPU model Heathrow RV770
GPU variant Heathrow PRO RV770 XT Mac (215-0669080)
Architecture GCN 1.0 TeraScale
Foundry TSMC TSMC
Manufacturing process 28 nm 55 nm
Number of transistors 1,500 million 956 million
Die size 123 mm² 256 mm²

Mobile graphics

Release date Apr 24th, 2012
Generation London (HD 7800M)
Production End-of-life
Interface PCIe 3.0 x16
Predecessor Vancouver
Successor Solar System

Clocks

GPU clock 675 MHz 750 MHz
Memory clock 1000 MHz 4 Gbps effective 850 MHz 3.4 Gbps effective

Memory Configuration

Memory size 2 GB 512 MB
Memory type GDDR5 GDDR5
Memory bus width 128 bit 256 bit
Bandwidth 64.00 GB/s 108.8 GB/s

Render Configuration

Shading units 640 800
TMUs 40 40
ROPs 16 16
Compute units 10 10
Cache L1 16 KB (per CU) 16 KB (per CU)
Cache L2 256 KB 256 KB

Performance

Pixel rate 10.80 GPixel/s 12.00 GPixel/s
Texture rate 27.00 GTexel/s 30.00 GTexel/s
FP32 (float) performance 864.0 GFLOPS 1,200 GFLOPS
FP64 (double) performance 54.00 GFLOPS (1:16) 240.0 GFLOPS (1:5)

Dimensions & Outputs

TDP 40 W 150 W
Outputs No outputs 1x DVI1x mini-DisplayPort
Slot width Dual-slot
Length 250 mm 9.8 inches
Suggested PSU 450 W
Power connectors 2x 6-pin
Board number B771

API Support & Features

DirectX 12 (11_1) 10.1 (10_1)
OpenGL 4.6 3.3
OpenCL 1.2 1.1
Vulkan 1.2
Shader model 5.1 4.1

Other Features

Graphics Card

Release date Jan 6th, 2009
Generation Radeon R700
Production End-of-life
Interface PCIe 2.0 x16
Reviews 135 in our database
Predecessor Radeon R600
Successor Evergreen

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