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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 GeForce GTS 250 Zotac ECO 1GB Edition
Cyberpunk 2077 653% 544%
Assassins Creed: Valhalla 589% 489%
Call of Duty: Black Ops Cold War 567% 470%
Hitman 3 880% 738%
Grand Theft Auto VI 960% 806%
FIFA 21 280% 225%
Far Cry 6 990% 832%
Genshin Impact 653% 544%
World of Warcraft: Shadowlands 980% 823%
Watch Dogs Legion 627% 521%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTS 250 Zotac ECO 1GB Edition are very slightly better than the Nvidia GeForce GT 640.

The GeForce GT 640 has a 227 MHz higher core clock speed than the GTS 250, but the GTS 250 has 32 more Texture Mapping Units than the GeForce GT 640. As a result, the GTS 250 exhibits a 14.3 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 227 MHz higher core clock speed than the GTS 250 and the same number of Render Output Units. This results in the GeForce GT 640 providing 3.6 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 a year more recently than the GTS 250, and so the GeForce GT 640 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GTS 250.

The GeForce GT 640 has 1024 MB more video memory than the GTS 250, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the GTS 250 has superior memory performance.

The GTS 250 has 35.5 GB/sec greater memory bandwidth than the GeForce GT 640, which means that the memory performance of the GTS 250 is noticeably better than the GeForce GT 640.

The GeForce GT 640 has 384 Shader Processing Units and the GeForce GTS 250 Zotac ECO 1GB Edition has 128. However, the actual shader performance of the GeForce GT 640 is 346 and the actual shader performance of the GTS 250 is 216. The GeForce GT 640 having 130 better shader performance is not particularly notable, as altogether the GTS 250 performs better when taking into account other relevant data.

The GeForce GT 640 transistor size technology is 27 nm (nanometers) smaller than the GTS 250. This means that the GeForce GT 640 is expected to run slightly cooler and achieve higher clock frequencies than the GTS 250.

The GeForce GT 640 requires 65 Watts to run and the GeForce GTS 250 Zotac ECO 1GB Edition requires 125 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 GTS 250. The GTS 250 requires 60 Watts more than the GeForce GT 640 to run. The difference is significant enough that the GTS 250 may have an adverse affect on your yearly electricity bills in comparison to the GeForce GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed902 MHzvs675 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2Tesla G92-428-B1
OC Potential Fair vs Fair
Driver Support Good vs Poor
Release Date05 Jun 2012vs01 Sep 2009
GPU LinkGD LinkGD Link

Resolution Performance

green tick vs -
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green tick vs green tick
green tick vs green tick

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed891 MHzvs1000 MHz
Memory Bus128 Bitvs256 Bit
Memory TypeDDR3vsGDDR3
Memory Bandwidth28.5GB/secvs64GB/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 Units384vs128
Actual Shader Performance17%vs10%
Texture Mapping Units32vs64
Texture Rate28.9 GTexel/svs43.2 GTexel/s
Render Output Units16vs16
Pixel Rate14.4 GPixel/svs10.8 GPixel/s

GPU Outputs

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

GPU Power Requirements

Max Power65 Wattsvs125 Watts
Recommended PSU350 Watts & 26 Ampsvs400 Watts & 29 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 Duo E7500 2.93GHz
Recommended RAM8 GBvs6 GB
Maximum Recommended Gaming Resolution1366x768vs1600x900

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 GTS 250 Zotac ECO 1GB Edition is a special edition of NVIDIA's fast-middle-class GeForce GTS 250, created by Zotac.

Overclock Out of The Box
The Central unit is actually underclocked reducing the power consumption and thus reducing the heat produced.

Cooling Solution
The Cooling System was replaced by Zotac's Single Fan Cooler, meaning the card runs cooler under load.

Because of being underclocked, GeForce GTS 250 Zotac ECO 1GB Edition is actually slower than the reference GeForce GTS 250.
Recommended CPU
Possible GPU Upgrades
GPU Variants