GeForce 8800 GTS (G92) vs GeForce GT 420

Intro

Compare those specifications to the GeForce GT 420, which features a core clock frequency of 700 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 48 SPUs, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce 8800 GTS (G92)		135 Watts
	Difference: 85 Watts (170%)

Memory Bandwidth

The GeForce 8800 GTS (G92) should theoretically perform much faster than the GeForce GT 420 overall. (explain)

GeForce 8800 GTS (G92)		62080 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 33280 (116%)

Texel Rate

The GeForce 8800 GTS (G92) should be much (more or less 643%) better at anisotropic filtering than the GeForce GT 420. (explain)

GeForce 8800 GTS (G92)		41600 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 36000 (643%)

Pixel Rate

The GeForce 8800 GTS (G92) should be much (about 271%) better at full screen anti-aliasing than the GeForce GT 420, and able to handle higher screen resolutions more effectively. (explain)

GeForce 8800 GTS (G92)		10400 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 7600 (271%)

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: Bandwidth is the max amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount of texture units of the card 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 the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. 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 many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.