GeForce GT 420 vs Radeon HD 5750 1GB

Intro

Compare those specifications to the Radeon HD 5750 1GB, which comes with clock speeds of 700 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 RAM. It features 720(144x5) SPUs along with 36 Texture Address Units 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

The Radeon HD 5750 1GB should theoretically be much faster than 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 (about 350%) better at AF than the GeForce GT 420. (explain)

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

Pixel Rate

The Radeon HD 5750 1GB will be much (approximately 300%) more effective at anti-aliasing than the GeForce GT 420, and should be capable of handling higher resolutions more effectively. (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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 maximum fill rate.