Iris Plus Graphics 645 vs GeForce GTX 660M Mac Edition

Place in the ranking	969	665
Place by popularity	not in top-100	not in top-100
Power efficiency	2.17	20.52
Architecture	Kepler (2012−2018)	Generation 9.5 (2016−2020)
GPU code name	GK107	Coffee Lake GT3e
Market segment	Laptop	Laptop
Release date	1 April 2013 (11 years ago)	7 October 2019 (5 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	384	384
Core clock speed	950 MHz	300 MHz
Boost clock speed	no data	1050 MHz
Number of transistors	1,270 million	no data
Manufacturing process technology	28 nm	14 nm+++
Power consumption (TDP)	50 Watt	15 Watt
Texture fill rate	30.40	50.40
Floating-point processing power	0.7296 TFLOPS	0.8064 TFLOPS
ROPs	16	6
TMUs	32	48

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	MXM-B (3.0)	Ring Bus
Supplementary power connectors	None	no data

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	System Shared
Maximum RAM amount	512 MB	System Shared
Memory bus width	128 Bit	System Shared
Memory clock speed	1250 MHz	System Shared
Memory bandwidth	80 GB/s	no data
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

Portable Device Dependent

Supported technologies

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

Quick Sync

no data

API compatibility

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

DirectX	12 (11_0)	12 (12_1)
Shader Model	5.1	6.4
OpenGL	4.6	4.6
OpenCL	1.2	3.0
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.

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

8−9

−213%

25
+213%

FPS performance in popular games

Full HD
Low Preset

Counter-Strike 2	12−14 +0%	12−14 +0%
Cyberpunk 2077	9−10 +0%	9−10 +0%
Elden Ring	10−11 +0%	10−11 +0%

Full HD
Medium Preset

Battlefield 5	12−14 +0%	12−14 +0%
Counter-Strike 2	12−14 +0%	12−14 +0%
Cyberpunk 2077	9−10 +0%	9−10 +0%
Forza Horizon 4	18−20 +0%	18−20 +0%
Metro Exodus	10−11 +0%	10−11 +0%
Red Dead Redemption 2	14−16 +0%	14−16 +0%
Valorant	9−10 +0%	9−10 +0%

Full HD
High Preset

Battlefield 5	12−14 +0%	12−14 +0%
Counter-Strike 2	12−14 +0%	12−14 +0%
Cyberpunk 2077	9−10 +0%	9−10 +0%
Dota 2	10 +0%	10 +0%
Elden Ring	10−11 +0%	10−11 +0%
Far Cry 5	23 +0%	23 +0%
Fortnite	24−27 +0%	24−27 +0%
Forza Horizon 4	18−20 +0%	18−20 +0%
Grand Theft Auto V	14−16 +0%	14−16 +0%
Metro Exodus	10−11 +0%	10−11 +0%
PLAYERUNKNOWN'S BATTLEGROUNDS	35−40 +0%	35−40 +0%
Red Dead Redemption 2	14−16 +0%	14−16 +0%
The Witcher 3: Wild Hunt	14−16 +0%	14−16 +0%
Valorant	9−10 +0%	9−10 +0%
World of Tanks	70−75 +0%	70−75 +0%

Full HD
Ultra Preset

Battlefield 5	12−14 +0%	12−14 +0%
Counter-Strike 2	12−14 +0%	12−14 +0%
Cyberpunk 2077	9−10 +0%	9−10 +0%
Dota 2	27 +0%	27 +0%
Far Cry 5	21−24 +0%	21−24 +0%
Forza Horizon 4	18−20 +0%	18−20 +0%
PLAYERUNKNOWN'S BATTLEGROUNDS	35−40 +0%	35−40 +0%
Valorant	9−10 +0%	9−10 +0%

1440p
High Preset

Dota 2	3−4 +0%	3−4 +0%
Elden Ring	5−6 +0%	5−6 +0%
Grand Theft Auto V	3−4 +0%	3−4 +0%
PLAYERUNKNOWN'S BATTLEGROUNDS	30−33 +0%	30−33 +0%
Red Dead Redemption 2	3−4 +0%	3−4 +0%
World of Tanks	30−35 +0%	30−35 +0%

1440p
Ultra Preset

Battlefield 5	6−7 +0%	6−7 +0%
Counter-Strike 2	9−10 +0%	9−10 +0%
Cyberpunk 2077	4−5 +0%	4−5 +0%
Far Cry 5	10−11 +0%	10−11 +0%
Forza Horizon 4	5−6 +0%	5−6 +0%
Metro Exodus	2−3 +0%	2−3 +0%
The Witcher 3: Wild Hunt	6−7 +0%	6−7 +0%
Valorant	12−14 +0%	12−14 +0%

4K
High Preset

Dota 2	16−18 +0%	16−18 +0%
Elden Ring	2−3 +0%	2−3 +0%
Grand Theft Auto V	16−18 +0%	16−18 +0%
Metro Exodus	0−1	0−1
PLAYERUNKNOWN'S BATTLEGROUNDS	12−14 +0%	12−14 +0%
Red Dead Redemption 2	3−4 +0%	3−4 +0%
The Witcher 3: Wild Hunt	16−18 +0%	16−18 +0%

4K
Ultra Preset

Battlefield 5	4−5 +0%	4−5 +0%
Cyberpunk 2077	1−2 +0%	1−2 +0%
Dota 2	16−18 +0%	16−18 +0%
Far Cry 5	5−6 +0%	5−6 +0%
Fortnite	3−4 +0%	3−4 +0%
Forza Horizon 4	3−4 +0%	3−4 +0%
Valorant	4−5 +0%	4−5 +0%

This is how GTX 660M Mac Edition and Iris Plus Graphics 645 compete in popular games:

Iris Plus Graphics 645 is 213% faster in 1080p

All in all, in popular games:

there's a draw in 60 tests (100%)

Pros & cons summary

Performance score	1.57	4.46
Recency	1 April 2013	7 October 2019
Chip lithography	28 nm	14 nm
Power consumption (TDP)	50 Watt	15 Watt

Iris Plus Graphics 645 has a 184.1% higher aggregate performance score, an age advantage of 6 years, a 100% more advanced lithography process, and 233.3% lower power consumption.

The Iris Plus Graphics 645 is our recommended choice as it beats the GeForce GTX 660M Mac Edition in performance tests.

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