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GeForce GT 640 DDR3 vs GeForce GTS 450 1GB

Intro

The GeForce GT 640 DDR3 comes with a GPU clock speed of 900 MHz, and the 2048 MB of DDR3 memory is set to run at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 Texture Address Units, and 16 ROPs.

Compare those specs to the GeForce GTS 450 1GB, which uses a 40 nm design. nVidia has clocked the core frequency at 783 MHz. The GDDR5 RAM runs at a frequency of 902 MHz on this particular model. It features 192 SPUs as well as 32 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTS 450 1GB 106 Watts
Difference: 41 Watts (63%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 450 1GB should be a small bit faster than the GeForce GT 640 DDR3 in general. (explain)

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

Texel Rate

The GeForce GT 640 DDR3 should be just a bit (about 15%) better at anisotropic filtering than the GeForce GTS 450 1GB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce GTS 450 1GB 25056 Mtexels/sec
Difference: 3744 (15%)

Pixel Rate

The GeForce GT 640 DDR3 is a small bit (about 15%) faster with regards to AA than the GeForce GTS 450 1GB, and also will be capable of handling higher resolutions better. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GTS 450 1GB 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

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

GeForce GTS 450 1GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GT 640 DDR3 GeForce GTS 450 1GB
Manufacturer nVidia nVidia
Year June 2012 September 2010
Code Name GK107 GF106
Memory 2048 MB 1024 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 max amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce GT 640 DDR3

Amazon.com

Check prices at:

GeForce GTS 450 1GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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