Radeon RX 6400 vs GeForce GT 640 OEM

Place in the ranking	935	279
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	54.16
Power efficiency	2.33	25.67
Architecture	Kepler (2012−2018)	RDNA 2.0 (2020−2024)
GPU code name	GK107	Navi 24
Market segment	Desktop	Desktop
Release date	24 April 2012 (12 years ago)	19 January 2022 (2 years ago)
Launch price (MSRP)	no data	$159

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

no data

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	384	768
Core clock speed	797 MHz	1923 MHz
Boost clock speed	no data	2321 MHz
Number of transistors	1,270 million	5,400 million
Manufacturing process technology	28 nm	6 nm
Power consumption (TDP)	50 Watt	53 Watt
Texture fill rate	25.50	111.4
Floating-point processing power	0.6121 TFLOPS	3.565 TFLOPS
ROPs	16	32
TMUs	32	48
Ray Tracing Cores	no data	12

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 3.0 x16	PCIe 4.0 x4
Length	145 mm	no data
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	DDR3	GDDR6
Maximum RAM amount	2 GB	4 GB
Memory bus width	128 Bit	64 Bit
Memory clock speed	891 MHz	2000 MHz
Memory bandwidth	28.51 GB/s	128.0 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 DVI, 1x HDMI, 1x DisplayPort	1x HDMI 2.1, 1x DisplayPort 1.4a
HDMI	+	+

API compatibility

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

DirectX	12 (11_0)	12 Ultimate (12_2)
Shader Model	5.1	6.7
OpenGL	4.6	4.6
OpenCL	1.2	2.2
Vulkan	1.1.126	1.3
CUDA	3.0	-

Gaming performance

Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.

Pros & cons summary

Performance score	1.70	19.84
Recency	24 April 2012	19 January 2022
Maximum RAM amount	2 GB	4 GB
Chip lithography	28 nm	6 nm
Power consumption (TDP)	50 Watt	53 Watt

GT 640 OEM has 6% lower power consumption.

RX 6400, on the other hand, has a 1067.1% higher aggregate performance score, an age advantage of 9 years, a 100% higher maximum VRAM amount, and a 366.7% more advanced lithography process.

The Radeon RX 6400 is our recommended choice as it beats the GeForce GT 640 OEM in performance tests.

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