GeForce 9800 GTX vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which features clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 memory. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
GeForce 9800 GTX		140 Watts
	Difference: 45 Watts (47%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GTX should theoretically be quite a bit better than the Radeon HD 4830 1GB in general. (explain)

GeForce 9800 GTX		70400 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 12800 (22%)

Texel Rate

The GeForce 9800 GTX is quite a bit (about 135%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

GeForce 9800 GTX		43200 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 24800 (135%)

Pixel Rate

The GeForce 9800 GTX will be just a bit (more or less 17%) faster with regards to FSAA than the Radeon HD 4830 1GB, and will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 9800 GTX		10800 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 1600 (17%)

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 megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.