Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game HD i5 6400T GeForce GT 640 Gigabyte OC 2GB Edition
Cyberpunk 2077 779% 591%
Assassins Creed: Valhalla 711% 538%
Call of Duty: Black Ops Cold War 803% 610%
Genshin Impact 787% 598%
eFootball PES 2021 347% 252%
Marvel's Avengers 740% 560%
Watch Dogs Legion 756% 573%
FIFA 21 347% 252%
Mafia: Definitive Edition 1172% 900%
Microsoft Flight Simulator 685% 517%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 640 Gigabyte OC 2GB Edition are noticeably better than the Intel HD i5 6400T.

The GT 640 has a 700 MHz higher core clock speed and 16 more Texture Mapping Units than the HD i5 6400T. This results in the GT 640 providing 28 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 GT 640 has a 700 MHz higher core clock speed and 8 more Render Output Units than the HD i5 6400T. This results in the GT 640 providing 14 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 HD i5 6400T was released over three years more recently than the GT 640, and so the HD i5 6400T is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GT 640 when running the latest games.

The GT 640 has 2048 MB video memory, but the HD i5 6400T does not have an entry, so the two GPUs cannot be reliably compared in this area.

The HD i5 6400T has 24 Shader Processing Units and the GeForce GT 640 Gigabyte OC 2GB Edition has 384. However, the actual shader performance of the HD i5 6400T is 182 and the actual shader performance of the GT 640 is 403. The GT 640 having 221 better shader performance and an altogether better performance when taking into account other relevant data means that the GT 640 delivers a slightly smoother and more efficient experience when processing graphical data than the HD i5 6400T.

The HD i5 6400T transistor size technology is 14 nm (nanometers) smaller than the GT 640. This means that the HD i5 6400T is expected to run slightly cooler and achieve higher clock frequencies than the GT 640.

The HD i5 6400T requires 35 Watts to run and the GeForce GT 640 Gigabyte OC 2GB Edition requires 65 Watts. We would recommend a PSU with at least 300 Watts for the HD i5 6400T and a PSU with at least 350 Watts for the GT 640. The GT 640 requires 30 Watts more than the HD i5 6400T to run. The difference is not significant enough for the GT 640 to have a noticeably larger impact on your yearly electricity bills than the HD i5 6400T.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed350 MHzvs1050 MHz
Boost Clock950 MHzvs-
ArchitectureSkylake GT2-R0Kepler GK107-300-A2
OC Potential None vs Poor
Driver Support Great vs Good
Release Date01 Sep 2015vs05 Jun 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
6.1
green tick vs -
1600x900
4.6
vs green tick
5.3
1920x1080
3.1
vs green tick
3.8
2560x1440
2.2
vs green tick
2.6
3840x2160
1.5
vs green tick
1.8

GPU Memory

MemoryN/Avs2048 MB
Memory Speed1067 MHzvs900 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR4vsDDR3
Memory Bandwidth34.1GB/secvs28.8GB/sec
L2 Cache 1024 KB green tick vs 256 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units24vs384
Actual Shader Performance9%vs19%
Technology14nmvs28nm
Texture Mapping Units16vs32
Texture Rate5.6 GTexel/svs33.6 GTexel/s
Render Output Units8vs16
Pixel Rate2.8 GPixel/svs16.8 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs1
DVI Connections0vs2
HDMI Connections0vs1
DisplayPort Connections0vs-
Comparison

GPU Power Requirements

Max Power35 Wattsvs65 Watts
Recommended PSU300 Watts & 20 Ampsvs350 Watts & 26 Amps

GPU Features

DirectX12.1vs12.0
Shader Model5.0vs5.0
Open GL4.4vs4.5
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsyes
Dedicatednovsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i5-6400T 2.2GHzvsIntel Core i3-3220 3.3GHz
Recommended RAM4 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
Intel HD i5 6400T is the specific version of Intel HD Graphics 530 Desktop that is integrated in the Core i5-6400T Processor.

Architecture
The Skylake Core includes support for DirectX 12.1, OpenCL 2.0 and OpenGL 4.4. Additionally, it also supports DDR4 Memory.

GPU
It equips a GPU Codenamed GT2-R0 which offers 24 Shader Processing Units, 16 TMUs and 8 ROPs. The Central Unit Initially Runs at 350MHz and goes up to 950MHz, in Turbo Mode.

Memory
The GPU Shares the System's RAM which varies from laptop to laptop. Typically, the GPU reserves 1.7GB. Depending on whether or not the system's RAM is Dual-Channeled, it can access either a 64-bit or 128-bit memory interface. The operating memory clock also depends on the at which speed the System's RAM is running and is limited by the highest operating speed that the Processor supports. In this case, it is 1067MHz.
It is then obvious the Memory Bandwidth depends on a lot of factors and thus this Graphics Card performance may vary heavily from system to system.

Performance
Gaming benchmarks put its performance almost on level with a dedicated GeForce 920M.

System Suggestions
Intel HD i5 6400T is best suited for resolutions up to and including 1366x768. We recommend a Decent Processor and 4GB of RAM for Optimal Performance.
Overview
GeForce GT 640 Gigabyte OC 2GB Edition is a special edition of NVIDIA's Middle-Class GeForce GT 640, created by Gigabyte.

Overclock: Central Unit
The Central Unit now runs at 1050MHz, instead of 902MHz.

Overclock: Memory Clock
The Operating Memory Clock and the Frame Buffer remain the same.

Cooling Solution
The Cooling System remains the same.

Performance
Benchmarks indicate a 8% performance over the reference GeForce GT 640.
Recommended CPU
Possible GPU Upgrades
N/A
N/A
GPU Variants
-
-