GeForce GT 420 vs GeForce GTX 560

Intro

Compare those specifications to the GeForce GTX 560, which features core clock speeds of 810 MHz on the GPU, and 1001 MHz on the 1024 MB of GDDR5 memory. It features 336 SPUs as well as 56 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		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 560 should be much faster than the GeForce GT 420 in general. (explain)

GeForce GTX 560		128128 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 99328 (345%)

Texel Rate

The GeForce GTX 560 will be quite a bit (about 710%) faster with regards to AF than the GeForce GT 420. (explain)

GeForce GTX 560		45360 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 39760 (710%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 560 is the winner, by far. (explain)

GeForce GTX 560		25920 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 23120 (826%)

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 maximum amount of information (measured in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core 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 is also dependant 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 reach the max fill rate.