AMD · Radeon RX 600 Series

AMD Radeon RX 640

The AMD Radeon RX 640 is a graphics card released on July 1, 2019, built on the GCN architecture. It has 512 shading units, 4 GB of GDDR5 memory on a 64-bit bus, 56.0 GB/s of memory bandwidth, a boost clock of 1.29 GHz and a 50 W board power rating. It scores 2,250 in the PassMark G3D benchmark. It supports DirectX 12, OpenGL 4.5 and OpenCL 2.0.

GCN

10/10 key specs recorded · 63 facts

Depth: 40 recorded fields, 12 features, 5 PassMark workloads

Specification data last verified July 27, 2026 against PassMark Videocard Benchmark and AMD.com Specifications. Coverage: 10 of 10 tracked specifications recorded.

PassMark Videocard Benchmark AMD.com Specifications PassMark Videocard Benchmark

Shading units

512cores

8 compute units

Memory

4 GB

GDDR5 · 64-bit

Boost clock

1.29 GHz

Board power

50 W

Performance

The AMD Radeon RX 640 scores 2,250 in the PassMark G3D benchmark, higher than 68.2% of the 2,658 GPUs benchmarked (PassMark rank #908), measured across 322 submitted results. Its PassMark G2D score is 342.

PassMark G3D Mark

2,250

Rank #908
Faster than 68.2% of 2,658 GPUs
322 samples

0relative to the fastest GPU on record (41,928)

PassMark workload tests

DirectX 9 39 fps

reference: fastest recorded 526 fps · faster than 53.1% of 1,675 GPUs

DirectX 10 8 fps

reference: fastest recorded 231 fps · faster than 45.3% of 1,602 GPUs

DirectX 11 17 fps

reference: fastest recorded 362 fps · faster than 46.4% of 1,430 GPUs

DirectX 12 14 fps

reference: fastest recorded 213 fps · faster than 45.3% of 1,274 GPUs

GPU Compute 892 ops/s

reference: fastest recorded 26,591 ops/s · faster than 44% of 1,447 GPUs

Averages of PassMark PerformanceTest submissions; frames/sec are PassMark test-scene rates, not game FPS. Tests PassMark does not report for this card are omitted. PassMark listing

In the PassMark workload tests the AMD Radeon RX 640 averages DirectX 9 39 fps, DirectX 10 8 fps, DirectX 11 17 fps, DirectX 12 14 fps and GPU Compute 892 ops/s, across 322 submitted results. Frames per second are PassMark test-scene rates, not game frame rates.

Theoretical throughput

FP32 (single precision) 1.65 TFLOPS stated by AMD

Pixel fill rate 20.6 GPixel/s stated by AMD

Texture fill rate 51.48 GTexel/s stated by AMD

AMD states a peak of FP32 (single precision) 1.65 TFLOPS, Pixel fill rate 20.6 GPixel/s and Texture fill rate 51.48 GTexel/s for the AMD Radeon RX 640.

As stated by PassMark

Category Desktop

Bus interface PCIe 3.0 x8

Max memory 4 GB

Core clock 1082 MHz

Memory clock 7000 MHz

DirectX 12.0

OpenGL 4.6

Max TDP 50 W

First benchmarked 2020-02-06

Samples 322

PassMark listing (collected 2026-10-01)

PassMark's own listing for the AMD Radeon RX 640 states the PCIe 3.0 x8 interface, up to 4 GB of memory, a core clock of 1082 MHz, DirectX 12.0 and OpenGL 4.6, first benchmarked on 2020-02-06. These are PassMark's figures, shown separately from the specification tables above.

Not to be confused with

This page covers the AMD Radeon RX 640 specifically. It is a different product from AMD Radeon RX 6400, which have their own specifications. Check the exact model name before comparing figures.

Graphics processor

Architecture GCN

Codename Not recorded

Chip Not recorded

Process node Not recorded

Transistors Not recorded

Die size Not recorded

The AMD Radeon RX 640 is based on the GCN architecture.

Shader configuration

Shading units 512

Compute units 8

Streaming multiprocessors Not recorded

Execution units Not recorded

Texture units (TMUs) Not recorded

Render output units (ROPs) Not recorded

Ray tracing cores Not recorded

Tensor / AI cores Not recorded

XMX engines Not recorded

Infinity cache Not recorded

The AMD Radeon RX 640 has 512 shading units and 8 compute units.

The AMD Radeon RX 640 does not use XMX engines; those are specific to Intel Arc graphics. Feex has no recorded ray tracing core count for the AMD Radeon RX 640.

Clock speeds

Base clock Not recorded

Boost clock 1.29 GHz

Game clock Not recorded

Memory clock Not recorded

Effective memory clock Not recorded

The AMD Radeon RX 640 boosts to 1.29 GHz.

Memory

Size 4 GB

Type GDDR5

Bus width 64-bit

Bandwidth 56.0 GB/s

The AMD Radeon RX 640 is equipped with 4 GB of GDDR5 memory, uses a 64-bit memory bus and delivers 56.0 GB/s of memory bandwidth.

Board and power

The AMD Radeon RX 640 has a board power rating of 50 W and it connects over PCIe 3.0 x8.

Board power (TDP) 50 W

Total board power Not recorded

Suggested PSU Not recorded

Power connectors Not recorded

Slot width Not recorded

Length Not recorded

Width Not recorded

Height Not recorded

Cooler Not recorded

Max temperature Not recorded

Bus interface PCIe 3.0 x8

Market

Launched July 1, 2019

Launch price Not recorded

Status Not recorded

Form factor Not recorded

Segment Desktop

Series Radeon RX 600 Series

The AMD Radeon RX 640 was released on July 1, 2019.

Benchmarks

PassMark G3D 2,250

PassMark G2D 342

Rank #908

Samples 322

Graphics and compute APIs

The AMD Radeon RX 640 supports DirectX 12, OpenGL 4.5 and OpenCL 2.0.

DirectX 12

OpenGL 4.5

OpenCL 2.0

CUDA is an NVIDIA technology and does not apply to the AMD Radeon RX 640. Feex has no recorded Vulkan version for the AMD Radeon RX 640.

Features

The AMD Radeon RX 640 has 4 supported features recorded outside the media engine. A feature that no source mentions is shown as not listed, never as unsupported.

Display features

Supported: AMD FreeSync

Support for AMD's variable refresh rate technology, which syncs compatible displays to the GPU to reduce tearing and stutter.
Supported: HDMI 4K output

The vendor states the GPU can drive a 4K display over HDMI.

Not listed (6)

No source Feex holds states whether the AMD Radeon RX 640 supports Stereoscopic 3D, 10-bit color output, VR ready, 8K display output, HDR output and 12-bit color output. That is silence, not a statement that they are unsupported.

The AMD Radeon RX 640 supports AMD FreeSync and HDMI 4K output under Display features.

Software and drivers

Supported: Radeon Chill

AMD driver feature that lowers frame rate when there is little on-screen action to cut power use and heat.
Supported: Radeon ReLive

AMD's built-in tool for recording and streaming gameplay.

Not listed (6)

No source Feex holds states whether the AMD Radeon RX 640 supports Enhanced Sync, Image sharpening, Radeon Anti-Lag, Radeon Boost, Radeon Super Resolution and AMD Fluid Motion Frames. That is silence, not a statement that they are unsupported.

The AMD Radeon RX 640 supports Radeon Chill and Radeon ReLive under Software and drivers.

Media engine

The AMD Radeon RX 640 provides hardware encode for H.264 (AVC) and HEVC (H.265) and hardware decode for H.264 (AVC) and HEVC (H.265).

AMD Unified Video Decoder SupportedAMD's older dedicated video-decoding block found on many GCN-era and earlier Radeon GPUs.

AMD Video Coding Engine SupportedAMD's older dedicated video-encoding block found on many GCN-era Radeon GPUs.

Hardware video codec support of the AMD Radeon RX 640
Codec	Encode	Decode
H.264 (AVC)4K H.264: encode supported, decode supported	Supported	Supported
HEVC (H.265)	Supported	Supported

supported explicitly not supported not stated by the vendor

Not listed: AV1 and VP9. No source Feex holds states whether the AMD Radeon RX 640 supports these codecs; that is silence, not a statement that they are unsupported.

Media engines recorded for the AMD Radeon RX 640: AMD Unified Video Decoder and AMD Video Coding Engine.

Display outputs

The AMD Radeon RX 640 offers outputs DisplayPort 1.4 HDR, HDMI 4K60 Support, Dual Link DVI and DisplayPort 1.4.

Outputs DisplayPort 1.4 HDR, HDMI 4K60 Support, Dual Link DVI

DisplayPort 1.4

Naming and aliases

The AMD Radeon RX 640 is also known by other names: PassMark also lists it as AMD Radeon (TM) RX 640, AMD Radeon RX 640 Series and AMD RadeonT RX 640.

Other names (PassMark) AMD Radeon (TM) RX 640; AMD Radeon RX 640 Series; AMD RadeonT RX 640

Frequently asked questions

How much VRAM does the AMD Radeon RX 640 have?

The AMD Radeon RX 640 has 4 GB of GDDR5 memory on a 64-bit bus. Its memory bandwidth is 56.0 GB/s.

How much power does the AMD Radeon RX 640 use and what power supply does it need?

The AMD Radeon RX 640 has a board power rating of 50 W.

How fast is the AMD Radeon RX 640?

The AMD Radeon RX 640 scores 2,250 in the PassMark G3D benchmark, higher than 68.2% of the 2,658 GPUs benchmarked. Its PassMark rank is #908. In the PassMark DirectX 12 test it averages 14 fps.