GeForce GT 420 vs GeForce GTX 285 1GB

Intro

Compare those specs to the GeForce GTX 285 1GB, which features a GPU core clock speed of 648 MHz, and 1024 MB of GDDR3 memory set to run at 1242 MHz through a 512-bit bus. It also is comprised of 240 SPUs, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 154 Watts (308%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 1GB should theoretically be quite a bit better than the GeForce GT 420 in general. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 130176 (452%)

Texel Rate

The GeForce GTX 285 1GB should be quite a bit (more or less 826%) faster with regards to texture filtering than the GeForce GT 420. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 46240 (826%)

Pixel Rate

The GeForce GTX 285 1GB will be a lot (approximately 641%) better at AA than the GeForce GT 420, and also able to handle higher screen resolutions better. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 17936 (641%)

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 information (in units of MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.