GeForce GT 420 vs GeForce GTX 460 2GB

Intro

Compare all of that to the GeForce GTX 460 2GB, which has a core clock frequency of 675 MHz and a GDDR5 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is made up of 336 SPUs, 56 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 460 2GB		160 Watts
	Difference: 110 Watts (220%)

Memory Bandwidth

Performance-wise, the GeForce GTX 460 2GB should theoretically be quite a bit better than the GeForce GT 420 in general. (explain)

GeForce GTX 460 2GB		115200 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 86400 (300%)

Texel Rate

The GeForce GTX 460 2GB will be much (more or less 575%) more effective at texture filtering than the GeForce GT 420. (explain)

GeForce GTX 460 2GB		37800 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 32200 (575%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 460 2GB is superior to the GeForce GT 420, by far. (explain)

GeForce GTX 460 2GB		21600 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 18800 (671%)

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 data (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum 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 higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core 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 is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.