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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Zotac Synergy 2GB Edition GeForce GT 640
Cyberpunk 2077 653% 653%
Assassins Creed: Valhalla 589% 589%
Call of Duty: Black Ops Cold War 567% 567%
Hitman 3 880% 880%
Grand Theft Auto VI 960% 960%
FIFA 21 280% 280%
Far Cry 6 990% 990%
Genshin Impact 653% 653%
World of Warcraft: Shadowlands 980% 980%
Watch Dogs Legion 627% 627%

In terms of overall gaming performance, the graphical capabilities of the GT 640 and the GeForce GT 640 are equal.

The GeForce GT 640 has a 2 MHz higher core clock speed and the same number of Texture Mapping Units as the GT 640. This results in the GeForce GT 640 providing 0.099999999999998 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 2 MHz higher core clock speed than the GT 640, but both GPUs exhibit the same Pixel Fill Rate. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

Both the GeForce GT 640 Zotac Synergy 2GB Edition and the GeForce GT 640 were released at the same time, so are likely to be quite similar.

The GeForce GT 640 Zotac Synergy 2GB Edition and the GeForce GT 640 have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The GeForce GT 640 has 2.9 GB/sec greater memory bandwidth than the GT 640, which means that the memory performance of the GeForce GT 640 is marginally better than the GT 640.

Both the GeForce GT 640 Zotac Synergy 2GB Edition and the GeForce GT 640 have 384 Shader Processing Units. Having the same number of SPUs and using the same architecture means that the performance they offer can be compared by looking at the memory bandwidth, Texture and Pixel Rates. In this case, the GeForce GT 640 has 0.099999999999998 GTexel/s better Texture Fill Rate and 2.9 GB/sec greater memory bandwidth, but the has GPixel/s better Pixel Fill Rate. Although the GPUs are very similar in performance, the GeForce GT 640 takes the edge.

The GeForce GT 640 Zotac Synergy 2GB Edition requires 65 Watts to run and the GeForce GT 640 requires 65 Watts. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 350 Watts for the GeForce GT 640. The two GPUs require the same amount of wattage to run. As such, there is no need to worry about which will more significantly affect your yearly electricity bills.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed900 MHzvs902 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2Kepler GK107-300-A2
OC Potential Fair vs Fair
Driver Support Good vs Good
Release Date05 Jun 2012vs05 Jun 2012
GPU LinkGD LinkGD Link

Resolution Performance

1366x768 - vs green tick
green tick vs green tick
green tick vs green tick
green tick vs green tick
green tick vs green tick

GPU Memory

Memory2048 MBvs2048 MB
Memory Speed800 MHzvs891 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth25.6GB/secvs28.5GB/sec
L2 Cache 256 KB green tick vs green tick 256 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs384
Actual Shader Performance17%vs17%
Texture Mapping Units32vs32
Texture Rate28.8 GTexel/svs28.9 GTexel/s
Render Output Units16vs16
Pixel Rate14.4 GPixel/svs14.4 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs1
DVI Connections2vs1
HDMI Connections0vs1
DisplayPort Connections-vs-

GPU Power Requirements

Max Power65 Wattsvs65 Watts
Recommended PSU350 Watts & 26 Ampsvs350 Watts & 26 Amps

GPU Features

Shader Model5.0vs5.0
Open GL4.5vs4.5
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

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

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
GeForce GT 640 Zotac Synergy 2GB Edition is a special edition of NVIDIA's Middle-Class GeForce GT 640, created by Zotac.

Overclock: Central Unit
The Central Unit runs at the same speed.

Overclock: Memory Clock
The Operating Memory Clock is now of 800MHz and the Frame Buffer remain the same.

Cooling Solution
The Cooling System remains the same.

Without Overclocking Out of The Box, GeForce GT 640 Zotac Synergy 2GB Edition is as fast as the reference GeForce GT 640.
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.
Recommended CPU
Possible GPU Upgrades
GPU Variants