Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 GeForce 9800 GT Green Edition
Hitman 3 880% 852%
Cyberpunk 2077 653% 632%
Assassins Creed: Valhalla 589% 569%
Resident Evil 8 653% 632%
FIFA 21 280% 269%
Grand Theft Auto VI 960% 930%
Call of Duty: Black Ops Cold War 567% 548%
Genshin Impact 653% 632%
Far Cry 6 990% 959%
The Medium 840% 813%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 9800 GT Green Edition are marginally better than the Nvidia GeForce GT 640.

The GeForce GT 640 has a 352 MHz higher core clock speed than the 9800 GT, but the 9800 GT has 24 more Texture Mapping Units than the GeForce GT 640. As a result, the 9800 GT exhibits a 1.9 GTexel/s better Texture Fill Rate than the GeForce GT 640. 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 352 MHz higher core clock speed than the 9800 GT and the same number of Render Output Units. This results in the GeForce GT 640 providing 5.6 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 9800 GT, 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 9800 GT when running the latest games.

The GeForce GT 640 has 1536 MB more video memory than the 9800 GT, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the 9800 GT has superior memory performance.

The 9800 GT has 29.1 GB/sec greater memory bandwidth than the GeForce GT 640, which means that the memory performance of the 9800 GT is slightly better than the GeForce GT 640.

The GeForce GT 640 has 384 Shader Processing Units and the GeForce 9800 GT Green Edition has 112. However, the actual shader performance of the GeForce GT 640 is 346 and the actual shader performance of the 9800 GT is 154. The GeForce GT 640 having 192 better shader performance is not particularly notable, as altogether the 9800 GT performs better when taking into account other relevant data.

The GeForce GT 640 transistor size technology is 37 nm (nanometers) smaller than the 9800 GT. This means that the GeForce GT 640 is expected to run much cooler and achieve higher clock frequencies than the 9800 GT. While they exhibit similar graphical performance, the GeForce GT 640 should consume less power than the 9800 GT.

The GeForce GT 640 requires 65 Watts to run and the GeForce 9800 GT Green Edition requires 75 Watts. We would recommend a PSU with at least 350 Watts for the GeForce GT 640 and a PSU with at least 400 Watts for the 9800 GT. The 9800 GT requires 10 Watts more than the GeForce GT 640 to run. The difference is not significant enough for the 9800 GT 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 MHzvs550 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2Tesla G92-270-A2
OC Potential Fair vs Fair
Driver Support Good vs Poor
Release Date05 Jun 2012vs15 Mar 2009
GPU LinkGD LinkGD Link

Resolution Performance

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green tick vs
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GPU Memory

Memory2048 MBvs512 MB
Memory Speed891 MHzvs900 MHz
Memory Bus128 Bitvs256 Bit
Memory TypeDDR3vsGDDR3
Memory Bandwidth28.5GB/secvs57.6GB/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%

GPU Display

Shader Processing Units384vs112
Actual Shader Performance17%vs7%
Texture Mapping Units32vs56
Texture Rate28.9 GTexel/svs30.8 GTexel/s
Render Output Units16vs16
Pixel Rate14.4 GPixel/svs8.8 GPixel/s

GPU Outputs

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

GPU Power Requirements

Max Power65 Wattsvs75 Watts
Recommended PSU350 Watts & 26 Ampsvs400 Watts & 26 Amps

GPU Features

Shader Model5.0vs4.0
Open GL4.5vs3.3
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core 2 Quad Q6600 2.4GHz
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.

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.

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.

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.

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.

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.
GeForce 9800 GT Green Edition is a tweaked GeForce 9800 GT optimized for power saving. With reduced clocks its performance is much worse than its default version but consumes only a maximum of 75 Watts. <\br> The core-clock was reduced from 600MHz to 550MHz. The Shaders clock was probably reduced too.
There are no benchmarks available but it's clear to say GeForce 9800 GT Green Edition's is somewhere between GeForce 8800 GTS and GeForce 8800 GT.
Recommended CPU
Possible GPU Upgrades
GPU Variants