AMD Radeon HD 8870 OEM vs ATI Radeon HD 4770

Table of Contents

Graphics Processor

GPU model Pitcairn RV740
GPU variant Pitcairn XT (215-0828047) RV740 XT (215-0727019)
Architecture GCN 1.0 TeraScale
Foundry TSMC TSMC
Manufacturing process 28 nm 40 nm
Number of transistors 2,800 million 826 million
Die size 212 mm² 137 mm²

Graphics Card

Release date Jan 8th, 2013 Apr 28th, 2009
Generation Sea Islands Radeon R700
Production End-of-life End-of-life
Interface PCIe 3.0 x16 PCIe 2.0 x16
Predecessor Southern Islands Radeon R600
Successor Volcanic Islands Evergreen
Launch price 109 USD
Reviews 82 in our database

Clocks

GPU clock 1000 MHz 750 MHz
Memory clock 1200 MHz 4.8 Gbps effective 800 MHz 3.2 Gbps effective

Memory Configuration

Memory size 2 GB 512 MB
Memory type GDDR5 GDDR5
Memory bus width 256 bit 128 bit
Bandwidth 153.6 GB/s 51.20 GB/s

Render Configuration

Shading units 1280 640
TMUs 80 32
ROPs 32 16
Compute units 20 8
Cache L1 16 KB (per CU) 16 KB (per CU)
Cache L2 512 KB 128 KB

Performance

Pixel rate 32.00 GPixel/s 12.00 GPixel/s
Texture rate 80.00 GTexel/s 24.00 GTexel/s
FP32 (float) performance 2.560 TFLOPS 960.0 GFLOPS
FP64 (double) performance 160.0 GFLOPS (1:16) 192.0 GFLOPS (1:5)

Dimensions & Outputs

Slot width Dual-slot Dual-slot
Length 241 mm 9.5 inches 203 mm 8 inches
TDP 175 W 80 W
Suggested PSU 450 W 250 W
Outputs 1x DVI1x HDMI2x mini-DisplayPort 2x DVI1x S-Video
Power connectors 2x 6-pin 1x 6-pin
Board number C401 B743

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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