GeForce GT 420 vs GeForce GT 440 3GB

Intro

Compare those specs to the GeForce GT 440 3GB, which features a GPU core clock speed of 594 MHz, and 3072 MB of GDDR3 memory running at 900 MHz through a 192-bit bus. It also is comprised of 144 Stream Processors, 24 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GT 440 3GB		56 Watts
	Difference: 6 Watts (12%)

Memory Bandwidth

The GeForce GT 440 3GB should theoretically be quite a bit faster than the GeForce GT 420 overall. (explain)

GeForce GT 440 3GB		43200 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 14400 (50%)

Texel Rate

The GeForce GT 440 3GB will be a lot (approximately 155%) faster with regards to AF than the GeForce GT 420. (explain)

GeForce GT 440 3GB		14256 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 8656 (155%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GT 440 3GB is superior to the GeForce GT 420, and very much so. (explain)

GeForce GT 440 3GB		14256 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 11456 (409%)

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 largest amount of data (in units of megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.