GeForce GT 420 vs Radeon HD 3650

Intro

Compare those specs to the Radeon HD 3650, which features core clock speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 RAM. It features 120(24x5) SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon HD 3650		78 Watts
	Difference: 28 Watts (56%)

Memory Bandwidth

Performance-wise, the GeForce GT 420 should theoretically be a little bit superior to the Radeon HD 3650 in general. (explain)

GeForce GT 420		28800 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 3200 (13%)

Texel Rate

The Radeon HD 3650 will be just a bit (approximately 4%) faster with regards to AF than the GeForce GT 420. (explain)

Radeon HD 3650		5800 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 200 (4%)

Pixel Rate

The Radeon HD 3650 will be just a bit (approximately 4%) more effective at full screen anti-aliasing than the GeForce GT 420, and capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 3650		2900 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 100 (4%)

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 max amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 can be applied in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.