GeForce GT 340 1GB vs Radeon HD 4830 512MB

Intro

Compare all of that to the Radeon HD 4830 512MB, which has core speeds of 575 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. 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 340 1GB		69 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 26 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 512MB will be 6% quicker than the GeForce GT 340 1GB overall, because of 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 bit (more or less 5%) more effective at texture 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 superior to the GeForce GT 340 1GB, by a large margin. (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 maximum amount of data (in units of MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.