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GeForce GT 640 DDR3 vs GeForce GTS 450


Intro

The GeForce GT 640 DDR3 has core clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 32 TAUs and 16 ROPs.

Compare all of that to the GeForce GTS 450, which features a GPU core clock speed of 783 MHz, and 512 MB of GDDR5 memory running at 902 MHz through a 128-bit bus. It also is made up of 192 SPUs, 32 TAUs, and 16 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GT 640 DDR3 1560 points
GeForce GTS 450 1460 points
Difference: 100 (7%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTS 450 106 Watts
Difference: 41 Watts (63%)

Memory Bandwidth

Performance-wise, the GeForce GTS 450 should in theory be a small bit superior to the GeForce GT 640 DDR3 overall. (explain)

GeForce GTS 450 57728 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 704 (1%)

Texel Rate

The GeForce GT 640 DDR3 is a bit (about 15%) better at AF than the GeForce GTS 450. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce GTS 450 25056 Mtexels/sec
Difference: 3744 (15%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 640 DDR3 is the winner, though only just barely. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GTS 450 12528 Mpixels/sec
Difference: 1872 (15%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

GeForce GT 640 DDR3

GeForce GTS 450

Specifications

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Model GeForce GT 640 DDR3 GeForce GTS 450
Manufacturer nVidia nVidia
Year June 2012 September 2010
Code Name GK107 GF106
Memory 2048 MB 512 MB
Core Speed 900 MHz 783 MHz
Memory Speed 3564 MHz 3608 MHz
Power (Max TDP) 65 watts 106 watts
Bandwidth 57024 MB/sec 57728 MB/sec
Texel Rate 28800 Mtexels/sec 25056 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 12528 Mpixels/sec
Unified Shaders 384 192
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 1170 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce GT 640 DDR3

GeForce GTS 450

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