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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Radeon HD 4770 512MB
Cyberpunk 2077 653% 519%
Hitman 3 880% 705%
Assassins Creed: Valhalla 589% 466%
Call of Duty: Black Ops Cold War 567% 448%
FIFA 21 280% 212%
Grand Theft Auto VI 960% 771%
Far Cry 6 990% 796%
Genshin Impact 653% 519%
Battlefield 6 880% 705%
Resident Evil 8 653% 519%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 4770 512MB are noticeably better than the Nvidia GeForce GT 640.

The GeForce GT 640 has a 152 MHz higher core clock speed and the same number of Texture Mapping Units as the HD 4770. This results in the GeForce GT 640 providing 4.9 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 152 MHz higher core clock speed than the HD 4770 and the same number of Render Output Units. This results in the GeForce GT 640 providing 2.4 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 GeForce GT 640 was released over three years more recently than the HD 4770, and so the GeForce GT 640 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the HD 4770 when running the latest games.

The GeForce GT 640 has 1536 MB more video memory than the HD 4770, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The HD 4770 has 22.7 GB/sec greater memory bandwidth than the GeForce GT 640, which means that the memory performance of the HD 4770 is slightly better than the GeForce GT 640.

The GeForce GT 640 has 384 Shader Processing Units and the Radeon HD 4770 512MB has 640. However, the actual shader performance of the GeForce GT 640 is 346 and the actual shader performance of the HD 4770 is 336. The GeForce GT 640 having 10 better shader performance is not particularly notable, as altogether the HD 4770 performs better when taking into account other relevant data.

The GeForce GT 640 transistor size technology is 12 nm (nanometers) smaller than the HD 4770. This means that the GeForce GT 640 is expected to run slightly cooler and achieve higher clock frequencies than the HD 4770.

The GeForce GT 640 requires 65 Watts to run and the Radeon HD 4770 512MB requires 80 Watts. We would recommend a PSU with at least 350 Watts for the GeForce GT 640 and a PSU with at least 500 Watts for the HD 4770. The HD 4770 requires 15 Watts more than the GeForce GT 640 to run. The difference is not significant enough for the HD 4770 to have a noticeably larger impact on your yearly electricity bills than the GeForce GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed902 MHzvs750 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2R700 RV740 PRO
OC Potential Fair vs Fair
Driver Support Good vs Poor
Release Date05 Jun 2012vs28 Apr 2009
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
6.6
green tick vs -
1600x900
5.1
vs green tick
5.6
1920x1080
3.5
vs green tick
4.1
2560x1440
2.5
green tick vs
2.4
3840x2160
1.7
green tick vs
1.6

GPU Memory

Memory2048 MBvs512 MB
Memory Speed891 MHzvs800 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsGDDR5
Memory Bandwidth28.5GB/secvs51.2GB/sec
L2 Cache 256 KB green tick vs 0 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs640
Actual Shader Performance17%vs16%
Technology28nmvs40nm
Texture Mapping Units32vs32
Texture Rate28.9 GTexel/svs24 GTexel/s
Render Output Units16vs16
Pixel Rate14.4 GPixel/svs12 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections1vs0
DVI Connections1vs2
HDMI Connections1vs1
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power65 Wattsvs80 Watts
Recommended PSU350 Watts & 26 Ampsvs500 Watts & 33 Amps

GPU Features

DirectX12.0vs10.1
Shader Model5.0vs4.1
Open GL4.5vs3.3
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsyes
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core 2 Quad Q9300 2.5GHz
Recommended RAM8 GBvs4 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.
Overview
Radeon HD 4770 512MB is a Performance Graphics Card based on the R700 Architecture.

Architecture
R700 was AMD's Second Unified Shader Architecture.

GPU
It equips a GPU Codenamed RV730 XT which has 8 Compute Units activated and thus offers 640 Shader Processing Units, 32 TMUs and 16 ROPs. The Central Unit is clocked at 750MHz.

Memory
The GPU accesses a 512MB frame buffer of fast GDDR5, through a 128-bit memory interface. The size of the frame buffer is adequate. The Memory Clock Operates at 800MHz.

Features
DirectX 10.1 Support (10.0 Hardware Default) and support for Crossfire.



Power Consumption
With a rated board TDP of 80W, it requires at least a 500W PSU and at least one available 6-pin connector.

Performance
Gaming benchmarks put its performance somewhat above a GeForce 9800 GT.
Recommended CPU
Possible GPU Upgrades
GPU Variants
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