GeForce GT 340 1GB vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which comes with GPU clock speed of 575 MHz, and 1024 MB of GDDR4 RAM set to run at 900 MHz through a 256-bit bus. It also features 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 1GB		95 Watts
	Difference: 26 Watts (38%)

Memory Bandwidth

The Radeon HD 4830 1GB, in theory, should perform a little bit faster than the GeForce GT 340 1GB in general. (explain)

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

Texel Rate

The Radeon HD 4830 1GB is a little bit (approximately 5%) more effective at AF than the GeForce GT 340 1GB. (explain)

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

Pixel Rate

The Radeon HD 4830 1GB will be much (about 109%) faster with regards to anti-aliasing than the GeForce GT 340 1GB, and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4830 1GB		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 within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units of the card 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.