GeForce GT 420 vs GeForce GTX 560 Ti

Intro

Compare those specs to the GeForce GTX 560 Ti, which uses a 40 nm design. nVidia has set the core frequency at 822 MHz. The GDDR5 memory works at a frequency of 1002 MHz on this specific card. It features 384 SPUs as well as 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

Theoretically speaking, the GeForce GTX 560 Ti is 345% faster than the GeForce GT 420 overall, because of its higher bandwidth. (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 a lot (more or less 839%) faster with regards to anisotropic 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 using a high screen resolution is important to you, then the GeForce GTX 560 Ti is a better choice, by far. (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: Bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.