GeForce GT 420 vs GeForce GTX 560 Ti

Intro

Compare those specifications to the GeForce GTX 560 Ti, which has a clock speed of 822 MHz and a GDDR5 memory speed of 1002 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is comprised of 384 SPUs, 64 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 560 Ti		170 Watts
	Difference: 120 Watts (240%)

Memory Bandwidth

In theory, the GeForce GTX 560 Ti is 345% faster than the GeForce GT 420 overall, due to its greater data rate. (explain)

GeForce GTX 560 Ti		128256 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 99456 (345%)

Texel Rate

The GeForce GTX 560 Ti is much (about 839%) more effective at texture filtering than the GeForce GT 420. (explain)

GeForce GTX 560 Ti		52608 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 47008 (839%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 560 Ti is superior to the GeForce GT 420, by a large margin. (explain)

GeForce GTX 560 Ti		26304 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 23504 (839%)

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 MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.