AMD Radeon R5 M255 vs ATI Mobility Radeon HD 3870 X2

Table of Contents

Graphics Processor

GPU model Topaz M88
GPU variant Topaz PRO (216-0864032)
Architecture GCN 3.0 TeraScale
Foundry TSMC TSMC
Manufacturing process 28 nm 55 nm
Number of transistors 1,550 million 666 million
Die size 125 mm² 192 mm²

Mobile graphics

Release date Oct 12th, 2014 Sep 1st, 2008
Generation Crystal System (R5 M200) M8x (Mobility HD 3800)
Production End-of-life End-of-life
Interface PCIe 3.0 x8 PCIe 2.0 x16
Predecessor Solar System M7x
Successor Mobility Radeon M9x
Reviews 2 in our database

Clocks

Base clock 925 MHz
Boost clock 940 MHz
Memory clock 1000 MHz 4 Gbps effective 850 MHz 1700 Mbps effective
GPU clock 660 MHz

Memory Configuration

Memory size 1024 MB 512 MB
Memory type GDDR5 GDDR3
Memory bus width 128 bit 256 bit
Bandwidth 64.00 GB/s 54.40 GB/s

Render Configuration

Shading units 384 320
TMUs 24 16
ROPs 8 16
Compute units 6 4
Cache L1 16 KB (per CU)
Cache L2 256 KB 256 KB

Performance

Pixel rate 7.520 GPixel/s 10.56 GPixel/s
Texture rate 22.56 GTexel/s 10.56 GTexel/s
FP16 (half) performance 721.9 GFLOPS (1:1)
FP32 (float) performance 721.9 GFLOPS 422.4 GFLOPS
FP64 (double) performance 45.12 GFLOPS (1:16) 84.48 GFLOPS (1:5)

Dimensions & Outputs

TDP unknown 110 W
Outputs No outputs No outputs

API Support & Features

DirectX 12 (12_0) 10.1 (10_1)
OpenGL 4.6 3.3
OpenCL 2.0
Vulkan 1.2
Shader model 6.3 4.1

Other Features

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