Radeon RX 6600M vs RX 640

Place in the ranking	616	134
Place by popularity	not in top-100	not in top-100
Power efficiency	7.14	24.78
Architecture	GCN 4.0 (2016−2020)	RDNA 2.0 (2020−2024)
GPU code name	Polaris 23	Navi 23
Market segment	Laptop	Laptop
Release date	13 May 2019 (5 years ago)	31 May 2021 (3 years 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 cores	640	1792
Core clock speed	1082 MHz	2068 MHz
Boost clock speed	1218 MHz	2416 MHz
Number of transistors	2,200 million	11,060 million
Manufacturing process technology	14 nm	7 nm
Power consumption (TDP)	50 Watt	100 Watt
Texture fill rate	48.72	270.6
Floating-point processing power	1.559 TFLOPS	8.659 TFLOPS
ROPs	16	64
TMUs	40	112
Ray Tracing Cores	no data	28

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	medium sized
Interface	PCIe 3.0 x8	PCIe 4.0 x8
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	8 GB
Memory bus width	64 Bit	128 Bit
Memory clock speed	1500 MHz	1750 MHz
Memory bandwidth	48 GB/s	224.0 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

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	6.5
OpenGL	4.6	4.6
OpenCL	2.0	2.1
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 5.14

RX 6600M 35.68
+594%

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 1983

RX 6600M 13766
+594%

3DMark 11 Performance GPU

3DMark 11 is an obsolete DirectX 11 benchmark by Futuremark. It used four tests based on two scenes, one being few submarines exploring the submerged wreck of a sunken ship, the other is an abandoned temple deep in the jungle. All the tests are heavy with volumetric lighting and tessellation, and despite being done in 1280x720 resolution, are relatively taxing. Discontinued in January 2020, 3DMark 11 is now superseded by Time Spy.

RX 640 5235

RX 6600M 31868
+509%

3DMark Vantage Performance

3DMark Vantage is an outdated DirectX 10 benchmark using 1280x1024 screen resolution. It taxes the graphics card with two scenes, one depicting a girl escaping some militarized base located within a sea cave, the other displaying a space fleet attack on a defenseless planet. It was discontinued in April 2017, and Time Spy benchmark is now recommended to be used instead.

RX 640 14141

RX 6600M 72686
+414%

3DMark Fire Strike Graphics

Fire Strike is a DirectX 11 benchmark for gaming PCs. It features two separate tests displaying a fight between a humanoid and a fiery creature made of lava. Using 1920x1080 resolution, Fire Strike shows off some realistic graphics and is quite taxing on hardware.

RX 640 3499

RX 6600M 23525
+572%

3DMark Cloud Gate GPU

Cloud Gate is an outdated DirectX 11 feature level 10 benchmark that was used for home PCs and basic notebooks. It displays a few scenes of some weird space teleportation device launching spaceships into unknown, using fixed resolution of 1280x720. Just like Ice Storm benchmark, it has been discontinued in January 2020 and replaced by 3DMark Night Raid.

RX 640 19946

RX 6600M 144612
+625%

3DMark Time Spy Graphics

RX 640 1008

RX 6600M 7840
+678%

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	27 −263%	98 +263%
1440p	7−8 −686%	55 +686%
4K	4−5 −675%	31 +675%

FPS performance in popular games

Full HD
Low Preset

Cyberpunk 2077

9−10

−1122%

110
+1122%

Full HD
Medium Preset

Assassin's Creed Odyssey	20 −440%	108 +440%
Assassin's Creed Valhalla	5−6 −1800%	95 +1800%
Battlefield 5	12−14 −785%	110−120 +785%
Call of Duty: Modern Warfare	10−12 −555%	70−75 +555%
Cyberpunk 2077	9−10 −900%	90 +900%
Far Cry 5	10−12 −609%	75−80 +609%
Far Cry New Dawn	14−16 −536%	85−90 +536%
Forza Horizon 4	30−35 −469%	180−190 +469%
Hitman 3	10−12 −582%	75−80 +582%
Horizon Zero Dawn	30−35 −358%	150−160 +358%
Metro Exodus	27 −330%	110−120 +330%
Red Dead Redemption 2	26 −227%	85−90 +227%
Shadow of the Tomb Raider	18−20 −606%	120−130 +606%
Watch Dogs: Legion	45−50 −162%	120−130 +162%

Full HD
High Preset

Assassin's Creed Odyssey	14−16 −1321%	199 +1321%
Assassin's Creed Valhalla	5−6 −1480%	79 +1480%
Battlefield 5	12−14 −785%	110−120 +785%
Call of Duty: Modern Warfare	10−12 −555%	70−75 +555%
Cyberpunk 2077	9−10 −700%	72 +700%
Far Cry 5	10−12 −609%	75−80 +609%
Far Cry New Dawn	14−16 −536%	85−90 +536%
Forza Horizon 4	30−35 −469%	180−190 +469%
Hitman 3	10−12 −582%	75−80 +582%
Horizon Zero Dawn	30−35 −358%	150−160 +358%
Metro Exodus	10 −1060%	110−120 +1060%
Red Dead Redemption 2	14−16 −507%	85−90 +507%
Shadow of the Tomb Raider	18−20 −861%	173 +861%
The Witcher 3: Wild Hunt	18−20 −311%	70−75 +311%
Watch Dogs: Legion	45−50 −162%	120−130 +162%

Full HD
Ultra Preset

Assassin's Creed Odyssey	14−16 −464%	79 +464%
Assassin's Creed Valhalla	5−6 −1280%	69 +1280%
Call of Duty: Modern Warfare	10−12 −555%	70−75 +555%
Cyberpunk 2077	9−10 −578%	61 +578%
Far Cry 5	10−12 −609%	75−80 +609%
Forza Horizon 4	30−35 −425%	168 +425%
Hitman 3	10−12 −582%	75−80 +582%
Horizon Zero Dawn	30−35 −306%	134 +306%
Shadow of the Tomb Raider	18−20 −750%	153 +750%
The Witcher 3: Wild Hunt	11 −673%	85 +673%
Watch Dogs: Legion	45−50 −25.5%	59 +25.5%

Full HD
Epic Preset

Red Dead Redemption 2

14−16

−507%

85−90
+507%

1440p
High Preset

Battlefield 5	10−11 −580%	65−70 +580%
Far Cry New Dawn	8−9 −575%	50−55 +575%

1440p
Ultra Preset

Assassin's Creed Odyssey	5−6 −920%	51 +920%
Assassin's Creed Valhalla	0−1	52
Call of Duty: Modern Warfare	4−5 −925%	40−45 +925%
Cyberpunk 2077	2−3 −1700%	36 +1700%
Far Cry 5	6−7 −583%	40−45 +583%
Forza Horizon 4	12−14 −1583%	200−210 +1583%
Hitman 3	9−10 −400%	45−50 +400%
Horizon Zero Dawn	10−12 −791%	98 +791%
Metro Exodus	3−4 −2733%	85 +2733%
The Witcher 3: Wild Hunt	4−5 −1450%	62 +1450%
Watch Dogs: Legion	30−35 −466%	180−190 +466%

1440p
Epic Preset

Red Dead Redemption 2

9−10

−578%

60−65
+578%

4K
High Preset

Battlefield 5	4−5 −775%	35−40 +775%
Far Cry New Dawn	3−4 −867%	27−30 +867%
Hitman 3	1−2 −2800%	27−30 +2800%
Horizon Zero Dawn	8−9 −2025%	170−180 +2025%
Metro Exodus	2−3 −2100%	40−45 +2100%
The Witcher 3: Wild Hunt	1−2 −4300%	44 +4300%

4K
Ultra Preset

Assassin's Creed Odyssey	3−4 −867%	29 +867%
Assassin's Creed Valhalla	2−3 −1250%	27 +1250%
Call of Duty: Modern Warfare	2−3 −1000%	21−24 +1000%
Cyberpunk 2077	0−1	14
Far Cry 5	3−4 −567%	20−22 +567%
Forza Horizon 4	4−5 −1750%	74 +1750%
Watch Dogs: Legion	1−2 −2000%	21 +2000%

4K
Epic Preset

Red Dead Redemption 2

6−7

−417%

30−35
+417%

1440p
Ultra Preset

Shadow of the Tomb Raider

100

+0%

100

+0%

4K
Ultra Preset

Shadow of the Tomb Raider

+0%

This is how RX 640 and RX 6600M compete in popular games:

RX 6600M is 263% faster in 1080p
RX 6600M is 686% faster in 1440p
RX 6600M is 675% faster in 4K

Here's the range of performance differences observed across popular games:

in The Witcher 3: Wild Hunt, with 4K resolution and the High Preset, the RX 6600M is 4300% faster.

All in all, in popular games:

RX 6600M is ahead in 68 tests (97%)
there's a draw in 2 tests (3%)

Pros & cons summary

Performance score	5.14	35.68
Recency	13 May 2019	31 May 2021
Maximum RAM amount	2 GB	8 GB
Chip lithography	14 nm	7 nm
Power consumption (TDP)	50 Watt	100 Watt

RX 640 has 100% lower power consumption.

RX 6600M, on the other hand, has a 594.2% higher aggregate performance score, an age advantage of 2 years, a 300% higher maximum VRAM amount, and a 100% more advanced lithography process.

The Radeon RX 6600M is our recommended choice as it beats the Radeon RX 640 in performance tests.

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