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AMD Radeon R9 255 OEM

AMD Cape Verde Image
The Radeon R9 255 OEM is a graphics card by AMD, launched in December 2013. Built on the 28 nm process, and based on the Cape Verde graphics processor, in its Cape Verde PRX variant, the card supports DirectX 12.0. The Cape Verde graphics processor is an average sized chip with a die area of 123 mm² and 1,500 million transistors. Unlike the fully unlocked Radeon HD 7770 GHz Edition, which uses the same GPU but has all 640 shaders enabled, AMD has disabled some shading units on the Radeon R9 255 OEM to reach the product's target shader count. It features 512 shading units, 32 texture mapping units and 16 ROPs. AMD has placed 2,048 MB GDDR5 memory on the card, which are connected using a 128-bit memory interface. The GPU is operating at a frequency of 900 MHz, which can be boosted up to 930 MHz, memory is running at 1150 MHz.
We recommend the AMD Radeon R9 255 OEM for gaming with highest details at resolutions up to, and including, 1280x720.
Being a dual-slot card, the AMD Radeon R9 255 OEM draws power from 1x 6-pin power connectors, with power draw rated at 65 W maximum. Radeon R9 255 OEM is connected to the rest of the system using a PCIe 3.0 x16 interface.

Graphics Processor

GPU Name: Cape Verde
GPU Variant: Cape Verde PRX
Architecture: GCN 1.0
Process Size: 28 nm
Transistors: 1,500 million
Die Size: 123 mm²

Graphics Card

Released: Dec 21st, 2013
Production Status: Active
Bus Interface: PCIe 3.0 x16

Clock Speeds

GPU Clock: 900 MHz
Boost Clock: 930 MHz
Memory Clock: 1150 MHz
4600 MHz effective


Memory Size: 2048 MB
Memory Type: GDDR5
Memory Bus: 128 bit
Bandwidth: 73.6 GB/s

Render Config

Shading Units: 512
TMUs: 32
ROPs: 16
Compute Units: 8
Pixel Rate: 14.88 GPixel/s
Texture Rate: 29.76 GTexel/s
Floating-point performance: 952.3 GFLOPS

Board Design

Slot Width: Dual-slot
TDP: 65 W
Power Connectors: 1x 6-pin
Board Number: C750

Graphics Features

DirectX: 12.0
OpenGL: 4.5
OpenCL: 1.2
Shader Model: 5.0


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Retail boards based on this design

Name GPU Clock Memory Clock Other Changes
ASUS R9 255 DDR3 800 MHz 900 MHz Boost Clock: 900 MHz, DDR3