AMD Radeon HD 7850M vs ATI Mobility Radeon HD 4870

Table of Contents

Graphics Processor

GPU model Heathrow M98
GPU variant Heathrow PRO M98 XT (216-0732023)
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 Jan 9th, 2009
Generation London (HD 7800M) M9x (Mobility HD 4800)
Production End-of-life End-of-life
Interface PCIe 3.0 x16 PCIe 2.0 x16
Predecessor Vancouver M8x
Successor Solar System Manhattan
Reviews 2 in our database

Clocks

GPU clock 675 MHz 550 MHz
Memory clock 1000 MHz 4 Gbps effective 888 MHz 1776 Mbps effective

Memory Configuration

Memory size 2 GB 512 MB
Memory type GDDR5 GDDR3
Memory bus width 128 bit 256 bit
Bandwidth 64.00 GB/s 56.83 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 8.800 GPixel/s
Texture rate 27.00 GTexel/s 22.00 GTexel/s
FP32 (float) performance 864.0 GFLOPS 880.0 GFLOPS
FP64 (double) performance 54.00 GFLOPS (1:16) 176.0 GFLOPS (1:5)

Dimensions & Outputs

TDP 40 W unknown
Outputs No outputs No outputs

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

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