GeForce GT 420 vs Radeon R9 270X

Intro

Compare all that to the Radeon R9 270X, which has GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 1400 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 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 R9 270X		180 Watts
	Difference: 130 Watts (260%)

Memory Bandwidth

The Radeon R9 270X, in theory, should be a lot faster than the GeForce GT 420 overall. (explain)

Radeon R9 270X		179200 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 150400 (522%)

Texel Rate

The Radeon R9 270X is much (approximately 1329%) more effective at anisotropic filtering than the GeForce GT 420. (explain)

Radeon R9 270X		80000 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 74400 (1329%)

Pixel Rate

The Radeon R9 270X is a lot (more or less 1043%) more effective at AA than the GeForce GT 420, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 270X		32000 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 29200 (1043%)

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 information (measured in MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's 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 rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.