GeForce GT 640M Mac Edition vs 9400 GT

Place in the ranking	1249	1097
Place by popularity	not in top-100	not in top-100
Power efficiency	0.58	2.23
Architecture	Tesla (2006−2010)	Kepler (2012−2018)
GPU code name	G96C	GK107
Market segment	Desktop	Laptop
Release date	27 August 2008 (16 years ago)	3 February 2013 (11 years ago)
Launch price (MSRP)	$79.99	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	16	384
Core clock speed	550 MHz	745 MHz
Number of transistors	314 million	1,270 million
Manufacturing process technology	55 nm	28 nm
Power consumption (TDP)	50 Watt	32 Watt
Maximum GPU temperature	105 °C	no data
Texture fill rate	4.400	23.84
Floating-point processing power	0.0448 TFLOPS	0.5722 TFLOPS
ROPs	4	8
TMUs	8	32

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).

Bus support	PCI-E 2.0	no data
Interface	PCIe 2.0 x16	PCIe 3.0 x16
Length	168 mm	no data
Height	4.376" (11.1 cm)	no data
Width	1-slot	no data
Supplementary power connectors	None	no data
SLI options	+	-

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	DDR2	GDDR5
Maximum RAM amount	512 MB	512 MB
Memory bus width	128 Bit	64 Bit
Memory clock speed	400 MHz	1250 MHz
Memory bandwidth	12.8 GB/s	40 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	Dual Link DVI	No outputs
Multi monitor support	+	no data
HDMI	+	-
Maximum VGA resolution	2048x1536	no data
Audio input for HDMI	S/PDIF	no data

API compatibility

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

DirectX	11.1 (10_0)	12 (11_0)
Shader Model	4.0	5.1
OpenGL	2.1	4.6
OpenCL	1.1	1.2
Vulkan	N/A	1.1.126
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	0.42	1.04
Recency	27 August 2008	3 February 2013
Chip lithography	55 nm	28 nm
Power consumption (TDP)	50 Watt	32 Watt

GT 640M Mac Edition has a 147.6% higher aggregate performance score, an age advantage of 4 years, a 96.4% more advanced lithography process, and 56.3% lower power consumption.

The GeForce GT 640M Mac Edition is our recommended choice as it beats the GeForce 9400 GT in performance tests.

Be aware that GeForce 9400 GT is a desktop card while GeForce GT 640M Mac Edition is a notebook one.

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