AMD Radeon R9 280 vs AMD Radeon R9 285X

Table of Contents

Graphics Processor

GPU model Tahiti Tonga
GPU variant Tahiti PRO3 (215-0821330) Tonga XT
Architecture GCN 1.0 GCN 3.0
Foundry TSMC TSMC
Manufacturing process 28 nm 28 nm
Number of transistors 4,313 million 5,000 million
Die size 352 mm² 366 mm²

Graphics Card

Release date Mar 4th, 2014 Never Released
Generation Volcanic Islands Volcanic Islands
Production End-of-life End-of-life
Launch price 279 USD
Interface PCIe 3.0 x16 PCIe 3.0 x16
Reviews 35 in our database
Predecessor Sea Islands Sea Islands
Successor Pirate Islands Pirate Islands

Clocks

Base clock 827 MHz
Boost clock 933 MHz
Memory clock 1250 MHz 5 Gbps effective 1375 MHz 5.5 Gbps effective
GPU clock 1002 MHz

Memory Configuration

Memory size 3 GB 3 GB
Memory type GDDR5 GDDR5
Memory bus width 384 bit 384 bit
Bandwidth 240.0 GB/s 264.0 GB/s

Render Configuration

Shading units 1792 2048
TMUs 112 128
ROPs 32 32
Compute units 28 32
Cache L1 16 KB (per CU) 16 KB (per CU)
Cache L2 768 KB 768 KB

Performance

Pixel rate 29.86 GPixel/s 32.06 GPixel/s
Texture rate 104.5 GTexel/s 128.3 GTexel/s
FP32 (float) performance 3.344 TFLOPS 4.104 TFLOPS
FP64 (double) performance 836.0 GFLOPS (1:4)

Dimensions & Outputs

Slot width Dual-slot Dual-slot
Length 275 mm 10.8 inches 267 mm 10.5 inches
Width 109 mm 4.3 inches
Height 36 mm 1.4 inches
TDP 200 W 200 W
Suggested PSU 550 W 550 W
Outputs 1x DVI2x HDMI1x DisplayPort 2x DVI1x HDMI1x DisplayPort
Power connectors 1x 6-pin + 1x 8-pin 1x 6-pin + 1x 8-pin
Board number C386 C765

API Support & Features

DirectX 12 (11_1) 12 (12_0)
OpenGL 4.6 4.6
OpenCL 1.2 2.0
Vulkan 1.2 1.2
Shader model 5.1 6.3

Other Features

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