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GeForce GT 640 DDR3 vs GeForce GTS 450


Intro

The GeForce GT 640 DDR3 uses a 28 nm design. nVidia has set the core frequency at 900 MHz. The DDR3 RAM is set to run at a frequency of 1782 MHz on this particular model. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare those specs to the GeForce GTS 450, which has a clock speed of 783 MHz and a GDDR5 memory speed of 902 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 192 SPUs, 32 TAUs, and 16 Raster Operation Units.

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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

Theoretically speaking, the GeForce GTS 450 should be 1% quicker than the GeForce GT 640 DDR3 in general, due to its higher data rate. (explain)

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

Texel Rate

The GeForce GT 640 DDR3 will be a bit (more or less 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

The GeForce GT 640 DDR3 should be just a bit (about 15%) more effective at full screen anti-aliasing than the GeForce GTS 450, and also capable of handling higher resolutions without losing too much performance. (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 maximum amount of data (measured in MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

GeForce GT 640 DDR3

GeForce GTS 450

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