Radeon Pro 580 vs GeForce GTX 660M Mac Edition

Place in the ranking	964	272
Place by popularity	not in top-100	not in top-100
Power efficiency	2.17	9.34
Architecture	Kepler (2012−2018)	GCN 4.0 (2016−2020)
GPU code name	GK107	Polaris 20
Market segment	Laptop	Mobile workstation
Release date	1 April 2013 (11 years ago)	5 June 2017 (7 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	2304
Core clock speed	950 MHz	1100 MHz
Boost clock speed	no data	1200 MHz
Number of transistors	1,270 million	5,700 million
Manufacturing process technology	28 nm	14 nm
Power consumption (TDP)	50 Watt	150 Watt
Texture fill rate	30.40	172.8
Floating-point processing power	0.7296 TFLOPS	5.53 TFLOPS
ROPs	16	32
TMUs	32	144

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)	PCIe 3.0 x16
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	GDDR5
Maximum RAM amount	512 MB	8 GB
Memory bus width	128 Bit	256 Bit
Memory clock speed	1250 MHz	1695 MHz
Memory bandwidth	80 GB/s	217.0 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

No outputs

API compatibility

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

DirectX	12 (11_0)	12 (12_0)
Shader Model	5.1	6.4
OpenGL	4.6	4.6
OpenCL	1.2	2.0
Vulkan	1.1.126	1.2.131
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	1.56	20.10
Recency	1 April 2013	5 June 2017
Maximum RAM amount	512 MB	8 GB
Chip lithography	28 nm	14 nm
Power consumption (TDP)	50 Watt	150 Watt

GTX 660M Mac Edition has 200% lower power consumption.

Pro 580, on the other hand, has a 1188.5% higher aggregate performance score, an age advantage of 4 years, a 1500% higher maximum VRAM amount, and a 100% more advanced lithography process.

The Radeon Pro 580 is our recommended choice as it beats the GeForce GTX 660M Mac Edition in performance tests.

Be aware that GeForce GTX 660M Mac Edition is a notebook graphics card while Radeon Pro 580 is a mobile workstation one.

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