GeForce GT 420 vs Radeon RX 580

Intro

Compare those specifications to the Radeon RX 580, which makes use of a 14 nm design. AMD has clocked the core speed at 1257 MHz. The GDDR5 RAM runs at a speed of 2000 MHz on this particular model. It features 2304 SPUs as well as 144 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon RX 580		185 Watts
	Difference: 135 Watts (270%)

Memory Bandwidth

In theory, the Radeon RX 580 should be a lot faster than the GeForce GT 420 in general. (explain)

Radeon RX 580		262144 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 233344 (810%)

Texel Rate

The Radeon RX 580 is a lot (about 3132%) better at AF than the GeForce GT 420. (explain)

Radeon RX 580		181008 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 175408 (3132%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 580 is superior to the GeForce GT 420, by far. (explain)

Radeon RX 580		40224 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 37424 (1337%)

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 MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. 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 also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.