GeForce GT 420 vs GeForce GTX 560 Ti 448

Intro

Compare those specs to the GeForce GTX 560 Ti 448, which has GPU clock speed of 732 MHz, and 1280 MB of GDDR5 memory running at 900 MHz through a 320-bit bus. It also is comprised of 448 SPUs, 56 Texture Address Units, and 40 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 560 Ti 448		210 Watts
	Difference: 160 Watts (320%)

Memory Bandwidth

In theory, the GeForce GTX 560 Ti 448 should be 400% faster than the GeForce GT 420 overall, because of its greater bandwidth. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 115200 (400%)

Texel Rate

The GeForce GTX 560 Ti 448 will be a lot (about 632%) more effective at anisotropic filtering than the GeForce GT 420. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 35392 (632%)

Pixel Rate

The GeForce GTX 560 Ti 448 is quite a bit (about 946%) more effective at anti-aliasing than the GeForce GT 420, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 560 Ti 448		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 maximum amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video 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 maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.