GeForce GT 420 vs Geforce GTX 770

Intro

Compare those specs to the Geforce GTX 770, which has clock speeds of 1046 MHz on the GPU, and 1753 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 128 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 770		230 Watts
	Difference: 180 Watts (360%)

Memory Bandwidth

The Geforce GTX 770, in theory, should be quite a bit faster than the GeForce GT 420 overall. (explain)

Geforce GTX 770		224384 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 195584 (679%)

Texel Rate

The Geforce GTX 770 should be a lot (more or less 2291%) faster with regards to AF than the GeForce GT 420. (explain)

Geforce GTX 770		133888 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 128288 (2291%)

Pixel Rate

The Geforce GTX 770 is much (more or less 1095%) more effective at anti-aliasing than the GeForce GT 420, and should be capable of handling higher resolutions better. (explain)

Geforce GTX 770		33472 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 30672 (1095%)

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 (counted in megabytes per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, 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 worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). 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 ability to get to the max fill rate.