RTX A400 vs Radeon R5 A255

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Primary details

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

Place in the rankingnot rated406
Place by popularitynot in top-100not in top-100
Power efficiencyno data16.62
ArchitectureGCN 3.0 (2014−2019)Ampere (2020−2024)
GPU code nameTopazGA107
Market segmentDesktopWorkstation
Release date2014 (10 years ago)16 April 2024 (less than a year 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 cores384768
Core clock speed925 MHz727 MHz
Boost clock speed940 MHz1762 MHz
Number of transistors1,550 million8,700 million
Manufacturing process technology28 nm8 nm
Power consumption (TDP)no data50 Watt
Texture fill rate22.5642.29
Floating-point processing powerno data2.706 TFLOPS
ROPs816
TMUs2424
Tensor Coresno data24
Ray Tracing Coresno data6

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).

InterfacePCIe 3.0 x8PCIe 4.0 x8
Lengthno data163 mm
Widthno data1-slot
Supplementary power connectorsno dataNone

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 typeGDDR5GDDR6
Maximum RAM amount1 GB4 GB
Memory bus width128 Bit64 Bit
Memory clock speed4 GB/s1500 MHz
Memory bandwidth64 GB/s96 GB/s

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 ConnectorsPortable Device Dependent4x mini-DisplayPort 1.4a

API compatibility

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

DirectX12 (12_0)12 Ultimate (12_2)
Shader Model6.56.7
OpenGL4.64.6
OpenCL2.13.0
Vulkan1.2.1701.3
CUDA-8.6

Pros & cons summary


Maximum RAM amount 1 GB 4 GB
Chip lithography 28 nm 8 nm

RTX A400 has a 300% higher maximum VRAM amount, and a 250% more advanced lithography process.

We couldn't decide between Radeon R5 A255 and RTX A400. We've got no test results to judge.

Be aware that Radeon R5 A255 is a desktop card while RTX A400 is a workstation one.


Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.

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AMD Radeon R5 A255
Radeon R5 A255
NVIDIA RTX A400
RTX A400

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Community ratings

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Rate Radeon R5 A255 on a scale of 1 to 5:

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