Radeon R9 255 OEM vs HD 6450 GDDR5

Primary details

GPU architecture, market segment, value for money and other general parameters compared.

Place in the ranking1130not rated
Place by popularitynot in top-100not in top-100
Power efficiency2.45no data
ArchitectureTerascale 2 (2009−2015)GCN 1.0 (2011−2020)
GPU code nameCaicosCape Verde
Market segmentDesktopDesktop
Release date18 April 2011 (13 years ago)21 December 2013 (11 years ago)

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores160512
Core clock speed750 MHz900 MHz
Boost clock speedno data930 MHz
Number of transistorsno data1,500 million
Manufacturing process technology40 nm28 nm
Power consumption (TDP)27 Watt65 Watt
Texture fill rateno data29.76
Floating-point processing powerno data0.9523 TFLOPS
ROPsno data16
TMUsno data32

Form factor & compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

Interfaceno dataPCIe 3.0 x16
Widthno data2-slot
Supplementary power connectorsno data1x 6-pin

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory typeGDDR5GDDR5
Maximum RAM amount1 GB2 GB
Memory bus width64 Bit128 Bit
Memory clock speed900 MHz1150 MHz
Memory bandwidthno data73.6 GB/s
Shared memory--

Connectivity and outputs

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display Connectorsno dataNo outputs

API and SDK compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX1112 (11_1)
Shader Modelno data5.1
OpenGLno data4.6
OpenCLno data1.2
Vulkan-1.2.131

Pros & cons summary


Recency 18 April 2011 21 December 2013
Maximum RAM amount 1 GB 2 GB
Chip lithography 40 nm 28 nm
Power consumption (TDP) 27 Watt 65 Watt

HD 6450 GDDR5 has 140.7% lower power consumption.

R9 255 OEM, on the other hand, has an age advantage of 2 years, a 100% higher maximum VRAM amount, and a 42.9% more advanced lithography process.

We couldn't decide between Radeon HD 6450 GDDR5 and Radeon R9 255 OEM. We've got no test results to judge.

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AMD Radeon HD 6450 GDDR5
Radeon HD 6450 GDDR5
AMD Radeon R9 255 OEM
Radeon R9 255 OEM

Other comparisons

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Community ratings

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3.4 25 votes

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