GeForce GT 340 1GB vs Radeon HD 4830 512MB

Intro

Compare those specifications to the Radeon HD 4830 512MB, which has a core clock frequency of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 26 Watts (38%)

Memory Bandwidth

In theory, the Radeon HD 4830 512MB is 6% quicker than the GeForce GT 340 1GB in general, due to its higher data rate. (explain)

Radeon HD 4830 512MB		57600 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 3200 (6%)

Texel Rate

The Radeon HD 4830 512MB should be a little bit (approximately 5%) better at anisotropic filtering than the GeForce GT 340 1GB. (explain)

Radeon HD 4830 512MB		18400 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 800 (5%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4830 512MB is a better choice, and very much so. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 4800 (109%)

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 data (measured in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher 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 the video 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 amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.