GeForce GT 420 vs Radeon HD 5750 1GB

Intro

Compare those specifications to the Radeon HD 5750 1GB, which comes with core speeds of 700 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 RAM. It features 720(144x5) SPUs as well as 36 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon HD 5750 1GB		86 Watts
	Difference: 36 Watts (72%)

Memory Bandwidth

Performance-wise, the Radeon HD 5750 1GB should theoretically be much superior to the GeForce GT 420 overall. (explain)

Radeon HD 5750 1GB		73600 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 44800 (156%)

Texel Rate

The Radeon HD 5750 1GB is quite a bit (approximately 350%) better at texture filtering than the GeForce GT 420. (explain)

Radeon HD 5750 1GB		25200 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 19600 (350%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 5750 1GB is a better choice, and very much so. (explain)

Radeon HD 5750 1GB		11200 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 8400 (300%)

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 data (measured in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface 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 card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.