GeForce GT 440 1.5GB vs GeForce GT 640 DDR3

Intro

Compare those specifications to the GeForce GT 640 DDR3, which comes with GPU core speed of 900 MHz, and 2048 MB of DDR3 memory running at 1782 MHz through a 128-bit bus. It also is made up of 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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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 GT 440 1.5GB		840 points
	Difference: 720 (86%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 1.5GB		56 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 9 Watts (16%)

Memory Bandwidth

The GeForce GT 640 DDR3 should in theory perform much faster than the GeForce GT 440 1.5GB in general. (explain)

GeForce GT 640 DDR3		57024 MB/sec
GeForce GT 440 1.5GB		43200 MB/sec
	Difference: 13824 (32%)

Texel Rate

The GeForce GT 640 DDR3 will be much (more or less 102%) better at anisotropic filtering than the GeForce GT 440 1.5GB. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
GeForce GT 440 1.5GB		14256 Mtexels/sec
	Difference: 14544 (102%)

Pixel Rate

The GeForce GT 640 DDR3 is a little bit (about 1%) more effective at full screen anti-aliasing than the GeForce GT 440 1.5GB, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
GeForce GT 440 1.5GB		14256 Mpixels/sec
	Difference: 144 (1%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.