GeForce GT 640 Rev. 2 vs Quadro K620

Place in the ranking	590	717
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	2.37	0.19
Power efficiency	8.90	5.02
Architecture	Maxwell (2014−2017)	Kepler 2.0 (2013−2015)
GPU code name	GM107	GK208
Market segment	Workstation	Desktop
Release date	22 July 2014 (10 years ago)	29 May 2013 (11 years ago)
Launch price (MSRP)	$189.89	$89

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

Quadro K620 has 1147% better value for money than GT 640 Rev. 2.

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	1058 MHz	1046 MHz
Boost clock speed	1124 MHz	no data
Number of transistors	1,870 million	915 million
Manufacturing process technology	28 nm	28 nm
Power consumption (TDP)	41 Watt	49 Watt
Texture fill rate	26.98	33.47
Floating-point processing power	0.8632 TFLOPS	0.8033 TFLOPS
ROPs	16	8
TMUs	24	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).

Interface	PCIe 2.0 x16	PCIe 2.0 x8
Length	160 mm	145 mm
Width	1" (2.5 cm)	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	128 Bit	GDDR5
Maximum RAM amount	2 GB	1 GB
Memory bus width	128 Bit	64 Bit
Memory clock speed	900 MHz	1252 MHz
Memory bandwidth	Up to 29 GB/s	40.06 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	1x DVI, 1x DisplayPort	1x DVI, 1x HDMI, 1x VGA
Number of simultaneous displays	4	no data
HDMI	-	+

Supported technologies

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

3D Vision Pro	+	no data
Mosaic	+	no data
nView Desktop Management	+	no data

API compatibility

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

DirectX	12	12 (11_0)
Shader Model	5.1	5.1
OpenGL	4.5	4.6
OpenCL	1.2	1.2
Vulkan	1.1.126	1.1.126
CUDA	5.0	3.5

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	5.78	3.55
Recency	22 July 2014	29 May 2013
Maximum RAM amount	2 GB	1 GB
Power consumption (TDP)	41 Watt	49 Watt

Quadro K620 has a 62.8% higher aggregate performance score, an age advantage of 1 year, a 100% higher maximum VRAM amount, and 19.5% lower power consumption.

The Quadro K620 is our recommended choice as it beats the GeForce GT 640 Rev. 2 in performance tests.

Be aware that Quadro K620 is a workstation graphics card while GeForce GT 640 Rev. 2 is a desktop one.

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