Radeon RX 6400 vs RX 640

Place in the ranking	616	276
Place by popularity	not in top-100	100
Cost-effectiveness evaluation	no data	53.66
Power efficiency	7.29	25.93
Architecture	GCN 4.0 (2016−2020)	RDNA 2.0 (2020−2024)
GPU code name	Polaris 23	Navi 24
Market segment	Laptop	Desktop
Release date	13 May 2019 (5 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	640	768
Core clock speed	1082 MHz	1923 MHz
Boost clock speed	1218 MHz	2321 MHz
Number of transistors	2,200 million	5,400 million
Manufacturing process technology	14 nm	6 nm
Power consumption (TDP)	50 Watt	53 Watt
Texture fill rate	48.72	111.4
Floating-point processing power	1.559 TFLOPS	3.565 TFLOPS
ROPs	16	32
TMUs	40	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).

Laptop size	large	no data
Interface	PCIe 3.0 x8	PCIe 4.0 x4
Width	no data	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	GDDR5	GDDR6
Maximum RAM amount	2 GB	4 GB
Memory bus width	64 Bit	64 Bit
Memory clock speed	1500 MHz	2000 MHz
Memory bandwidth	48 GB/s	128.0 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 Connectors	No outputs	1x HDMI 2.1, 1x DisplayPort 1.4a
HDMI	-	+

Supported technologies

Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.

FreeSync

API compatibility

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

DirectX	12 (12_0)	12 Ultimate (12_2)
Shader Model	6.4	6.7
OpenGL	4.6	4.6
OpenCL	2.0	2.2
Vulkan	1.2.131	1.3

Synthetic benchmark performance

Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.

Combined synthetic benchmark score

This is our combined benchmark score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

RX 640 5.23

RX 6400 19.71
+277%

Passmark

This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.

RX 640 2017

RX 6400 7605
+277%

Gaming performance

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

Average FPS across all PC games

Here are the average frames per second in a large set of popular games across different resolutions:

Full HD

−260%

90−95
+260%

Cost per frame, $

1080p

no data

1.77

FPS performance in popular games

Full HD
Low Preset

Cyberpunk 2077

9−10
−233%

30−33

+233%

Full HD
Medium Preset

Assassin's Creed Odyssey	20 −275%	75−80 +275%
Assassin's Creed Valhalla	5−6 −260%	18−20 +260%
Battlefield 5	12−14 −246%	45−50 +246%
Call of Duty: Modern Warfare	10−12 −264%	40−45 +264%
Cyberpunk 2077	9−10 −233%	30−33 +233%
Far Cry 5	10−12 −264%	40−45 +264%
Far Cry New Dawn	14−16 −257%	50−55 +257%
Forza Horizon 4	30−35 −275%	120−130 +275%
Hitman 3	10−12 −264%	40−45 +264%
Horizon Zero Dawn	30−35 −264%	120−130 +264%
Metro Exodus	27 −270%	100−105 +270%
Red Dead Redemption 2	26 −265%	95−100 +265%
Shadow of the Tomb Raider	18−20 −261%	65−70 +261%
Watch Dogs: Legion	45−50 −262%	170−180 +262%

Full HD
High Preset

Assassin's Creed Odyssey	14−16 −257%	50−55 +257%
Assassin's Creed Valhalla	5−6 −260%	18−20 +260%
Battlefield 5	12−14 −246%	45−50 +246%
Call of Duty: Modern Warfare	10−12 −264%	40−45 +264%
Cyberpunk 2077	9−10 −233%	30−33 +233%
Far Cry 5	10−12 −264%	40−45 +264%
Far Cry New Dawn	14−16 −257%	50−55 +257%
Forza Horizon 4	30−35 −275%	120−130 +275%
Hitman 3	10−12 −264%	40−45 +264%
Horizon Zero Dawn	30−35 −264%	120−130 +264%
Metro Exodus	10 −250%	35−40 +250%
Red Dead Redemption 2	14−16 −257%	50−55 +257%
Shadow of the Tomb Raider	18−20 −261%	65−70 +261%
The Witcher 3: Wild Hunt	18−20 −261%	65−70 +261%
Watch Dogs: Legion	45−50 −262%	170−180 +262%

Full HD
Ultra Preset

Assassin's Creed Odyssey	14−16 −257%	50−55 +257%
Assassin's Creed Valhalla	5−6 −260%	18−20 +260%
Call of Duty: Modern Warfare	10−12 −264%	40−45 +264%
Cyberpunk 2077	9−10 −233%	30−33 +233%
Far Cry 5	10−12 −264%	40−45 +264%
Forza Horizon 4	30−35 −275%	120−130 +275%
Hitman 3	10−12 −264%	40−45 +264%
Horizon Zero Dawn	30−35 −264%	120−130 +264%
Shadow of the Tomb Raider	18−20 −261%	65−70 +261%
The Witcher 3: Wild Hunt	11 −264%	40−45 +264%
Watch Dogs: Legion	45−50 −262%	170−180 +262%

Full HD
Epic Preset

Red Dead Redemption 2

14−16

−257%

50−55
+257%

1440p
High Preset

Battlefield 5	10−11 −250%	35−40 +250%
Far Cry New Dawn	8−9 −275%	30−33 +275%

1440p
Ultra Preset

Assassin's Creed Odyssey	5−6 −260%	18−20 +260%
Assassin's Creed Valhalla	0−1	0−1
Call of Duty: Modern Warfare	4−5 −250%	14−16 +250%
Cyberpunk 2077	2−3 −250%	7−8 +250%
Far Cry 5	6−7 −250%	21−24 +250%
Forza Horizon 4	12−14 −275%	45−50 +275%
Hitman 3	9−10 −233%	30−33 +233%
Horizon Zero Dawn	10−12 −264%	40−45 +264%
Metro Exodus	3−4 −233%	10−11 +233%
The Witcher 3: Wild Hunt	4−5 −250%	14−16 +250%
Watch Dogs: Legion	30−35 −275%	120−130 +275%

1440p
Epic Preset

Red Dead Redemption 2

9−10
−233%

30−33

+233%

4K
High Preset

Battlefield 5	4−5 −250%	14−16 +250%
Far Cry New Dawn	3−4 −233%	10−11 +233%
Hitman 3	1−2 −200%	3−4 +200%
Horizon Zero Dawn	8−9 −275%	30−33 +275%
Metro Exodus	2−3 −250%	7−8 +250%
The Witcher 3: Wild Hunt	1−2 −200%	3−4 +200%

4K
Ultra Preset

Assassin's Creed Odyssey	3−4 −233%	10−11 +233%
Assassin's Creed Valhalla	2−3 −250%	7−8 +250%
Call of Duty: Modern Warfare	2−3 −250%	7−8 +250%
Cyberpunk 2077	0−1	0−1
Far Cry 5	3−4 −233%	10−11 +233%
Forza Horizon 4	4−5 −250%	14−16 +250%
Watch Dogs: Legion	1−2 −200%	3−4 +200%

4K
Epic Preset

Red Dead Redemption 2

6−7
−250%

21−24

+250%

This is how RX 640 and RX 6400 compete in popular games:

RX 6400 is 260% faster in 1080p

Pros & cons summary

Performance score	5.23	19.71
Recency	13 May 2019	19 January 2022
Maximum RAM amount	2 GB	4 GB
Chip lithography	14 nm	6 nm
Power consumption (TDP)	50 Watt	53 Watt

RX 640 has 6% lower power consumption.

RX 6400, on the other hand, has a 276.9% higher aggregate performance score, an age advantage of 2 years, a 100% higher maximum VRAM amount, and a 133.3% more advanced lithography process.

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

Be aware that Radeon RX 640 is a notebook card while Radeon RX 6400 is a desktop one.

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