Radeon RX 640 OEM vs RX 6400

Primary details

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

Place in the ranking	279	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	54.04	no data
Power efficiency	25.61	no data
Architecture	RDNA 2.0 (2020−2024)	GCN 4.0 (2016−2020)
GPU code name	Navi 24	Polaris 23
Market segment	Desktop	Desktop
Release date	19 January 2022 (2 years ago)	9 April 2020 (4 years ago)
Launch price (MSRP)	$159	no data

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

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 cores	768	640
Core clock speed	1923 MHz	1295 MHz
Boost clock speed	2321 MHz	no data
Number of transistors	5,400 million	2,200 million
Manufacturing process technology	6 nm	14 nm
Power consumption (TDP)	53 Watt	50 Watt
Texture fill rate	111.4	51.80
Floating-point processing power	3.565 TFLOPS	1.658 TFLOPS
ROPs	32	16
TMUs	48	40
Ray Tracing Cores	12	no data

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).

Interface	PCIe 4.0 x4	PCIe 3.0 x8
Width	1-slot	1-slot
Supplementary power connectors	None	None

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 type	GDDR6	GDDR5
Maximum RAM amount	4 GB	4 GB
Memory bus width	64 Bit	128 Bit
Memory clock speed	2000 MHz	1500 MHz
Memory bandwidth	128.0 GB/s	96 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 Connectors	1x HDMI 2.1, 1x DisplayPort 1.4a	1x DisplayPort 1.4a, 2x mini-DisplayPort 1.4a
HDMI	+	-

API compatibility

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

DirectX	12 Ultimate (12_2)	12 (12_0)
Shader Model	6.7	6.7 (6.4)
OpenGL	4.6	4.6
OpenCL	2.2	2.1
Vulkan	1.3	1.3

Pros & cons summary

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Recency	19 January 2022	9 April 2020
Chip lithography	6 nm	14 nm
Power consumption (TDP)	53 Watt	50 Watt

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