GeForce GT 420 vs Geforce GTX 760

Intro

Compare those specs to the Geforce GTX 760, which has GPU clock speed of 980 MHz, and 2048 MB of GDDR5 RAM set to run at 1502 MHz through a 256-bit bus. It also features 1152 Stream Processors, 96 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 760		170 Watts
	Difference: 120 Watts (240%)

Memory Bandwidth

Performance-wise, the Geforce GTX 760 should in theory be much better than the GeForce GT 420 overall. (explain)

Geforce GTX 760		192256 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 163456 (568%)

Texel Rate

The Geforce GTX 760 will be a lot (approximately 1580%) more effective at AF than the GeForce GT 420. (explain)

Geforce GTX 760		94080 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 88480 (1580%)

Pixel Rate

The Geforce GTX 760 should be a lot (approximately 1020%) better at AA than the GeForce GT 420, and also will be able to handle higher resolutions without slowing down too much. (explain)

Geforce GTX 760		31360 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 28560 (1020%)

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 (counted in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.