GeForce GT 420 vs GeForce GTX 570

Intro

Compare those specifications to the GeForce GTX 570, which has core speeds of 732 MHz on the GPU, and 950 MHz on the 1280 MB of GDDR5 RAM. It features 480 SPUs as well as 60 TAUs and 40 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 570		219 Watts
	Difference: 169 Watts (338%)

Memory Bandwidth

The GeForce GTX 570 should theoretically perform much faster than the GeForce GT 420 overall. (explain)

GeForce GTX 570		152000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 123200 (428%)

Texel Rate

The GeForce GTX 570 should be much (more or less 684%) better at texture filtering than the GeForce GT 420. (explain)

GeForce GTX 570		43920 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 38320 (684%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 570 is superior to the GeForce GT 420, by far. (explain)

GeForce GTX 570		29280 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 26480 (946%)

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 max amount of information (measured in megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 applied in one second. This number is calculated by multiplying the total 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes 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, 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.