Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Quadro K620
Cyberpunk 2077 653% 858%
Assassins Creed: Valhalla 589% 777%
Call of Duty: Black Ops Cold War 567% 748%
Hitman 3 880% 1147%
Grand Theft Auto VI 960% 1249%
FIFA 21 280% 383%
Far Cry 6 990% 1287%
Genshin Impact 653% 858%
World of Warcraft: Shadowlands 980% 1274%
Watch Dogs Legion 627% 825%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 640 are noticeably better than the Nvidia Quadro K620.

The GeForce GT 640 has a 235 MHz higher core clock speed and the same number of Texture Mapping Units as the Quadro K620. This results in the GeForce GT 640 providing 7.6 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GeForce GT 640 has a 235 MHz higher core clock speed than the Quadro K620 and the same number of Render Output Units. This results in the GeForce GT 640 providing 3.7 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The Quadro K620 was released over a year more recently than the GeForce GT 640, and so the Quadro K620 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce GT 640.

The GeForce GT 640 has 1024 MB more video memory than the Quadro K620, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the Quadro K620 has superior memory performance.

The Quadro K620 has 0.3 GB/sec greater memory bandwidth than the GeForce GT 640, which means that the memory performance of the Quadro K620 is marginally better than the GeForce GT 640.

Both the GeForce GT 640 and the Quadro K620 have 384 Shader Processing Units. The two GPUs are based on different architectures, but deliver an equivalent shader performance. To compare, we must continue to look at the memory bandwidth, Texture and Pixel Rates. In this case, the GeForce GT 640 has 7.6 GTexel/s better Texture Fill Rate and 3.7 GPixel/s better Pixel Fill Rate, but the Quadro K620 has 0.3 GB/sec greater memory bandwidth. Although the GPUs are very similar in performance, the GeForce GT 640 takes the edge.

The GeForce GT 640 requires 65 Watts to run and the Quadro K620 requires 45 Watts. We would recommend a PSU with at least 350 Watts for the GeForce GT 640 and a PSU with at least 350 Watts for the Quadro K620. The GeForce GT 640 requires 20 Watts more than the Quadro K620 to run. The difference is not significant enough for the GeForce GT 640 to have a noticeably larger impact on your yearly electricity bills than the Quadro K620.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed902 MHzvs667 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2Maxwell GM107
OC Potential Fair vs Great
Driver Support Good vs Great
Release Date05 Jun 2012vs22 Jul 2014
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
6.6
green tick vs -
1600x900
5.1
green tick vs -
1920x1080
3.5
green tick vs -
2560x1440
2.5
green tick vs -
3840x2160
1.7
green tick vs -

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed891 MHzvs900 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth28.5GB/secvs28.8GB/sec
L2 Cache 256 KB vs green tick 2048 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs384
Actual Shader Performance17%vs17%
Technology28nmvs28nm
Texture Mapping Units32vs32
Texture Rate28.9 GTexel/svs21.3 GTexel/s
Render Output Units16vs16
Pixel Rate14.4 GPixel/svs10.7 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections1vs0
DVI Connections1vs1
HDMI Connections1vs0
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power65 Wattsvs45 Watts
Recommended PSU350 Watts & 26 Ampsvs350 Watts & 23 Amps

GPU Features

DirectX12.0vs12.0
Shader Model5.0vs5.0
Open GL4.5vs4.5
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsno
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core i3-4160 3.6GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
GeForce GT 640 is a Middle-Class Graphics Card based on the first revision of the Kepler Architecture.

Architecture
The Kepler Architecture was NVIDIA's big step to power efficiency. Each Stream Multiprocessor (SMX) now hosts 192 Shader Processing Units - against the 48 of older Fermi Architecture, and has been redesigned being now clocked at the same speed of the Central Unit. This means they are more energy efficient and will consequently lead to cooler operating temperatures. However, it also means they are weaker. It can be said that one Fermi SMX is as fast as 2 Kepler SMXs.
Additionally, and not available in all GPUs, Kepler also introduced the Boost Clock Feature. The Boost Clock is an even higher Clock Speed activated when in gaming mode and becomes the effective speed of the GPU.

GPU
It equips a GPU Codenamed GK107-300-A2 which has 2 Stream Multiprocessor activated and thus offers 384 Shader Processing Units, 32 TMUs and 16 ROPs. The Central Unit is clocked at 902MHz.

Memory
The GPU accesses a 2GB frame buffer of DDR3, through a 128-bit memory interface. The size of the frame buffer is exaggerated and in no way benefits the GPU. The Memory Clock Operates at 891MHz.

Features
DirectX 11.0 Support (11.0 Hardware Default) and support for Optimus, CUDA, OpenCL, DirectCompute, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies

Power Consumption
With a rated board TDP of 65W, it requires at least a 350W PSU and it relies entirely on the PCI Slot for power, meaning no extra connectors are required.

Performance
Gaming benchmarks put its performance on average with Radeon HD 6670.

System Suggestions
We recommend a Modest Processor (Intel Core i3) and 8GB of RAM for a system with GeForce GT 640.
Quadro K620 is a middle-class professional card based on the 28nm, Maxwell architecture.

It's based on the Maxwell GM107 GPU and offers 384 Shader Processing Units, 32 TMUs and 16 ROPs, on a 128-bit memory interface of standard DDR3. The central unit runs at 667MHz and the memory clock operates at up to 900MHz. It has a L2 Cache of 2048KB and a rated board TDP of 45 Watts.

Quadro K620's drivers are certified for professional applications only. Its gaming performance is about 30% above GeForce GT 720.
Recommended CPU
Possible GPU Upgrades
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GPU Variants
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