GeForce GT 320 vs Radeon HD 4830 1GB

Intro

Compare all that to the Radeon HD 4830 1GB, which comes with core speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 52 Watts (121%)

Memory Bandwidth

In theory, the Radeon HD 4830 1GB should perform much faster than the GeForce GT 320 in general. (explain)

Radeon HD 4830 1GB		57600 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 32320 (128%)

Texel Rate

The Radeon HD 4830 1GB is a lot (more or less 42%) more effective at texture filtering than the GeForce GT 320. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 5440 (42%)

Pixel Rate

The Radeon HD 4830 1GB should be quite a bit (more or less 113%) faster with regards to AA than the GeForce GT 320, and will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 4880 (113%)

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 max amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels 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 figure is worked out by multiplying the number of colour ROPs by the clock 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 rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.