GeForce GT 340 vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which features a core clock speed of 575 MHz and a GDDR4 memory speed of 900 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 1GB should be 6% faster than the GeForce GT 340 overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 4830 1GB will be a small bit (approximately 5%) more effective at texture filtering than the GeForce GT 340. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4830 1GB is a better choice, by a large margin. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
GeForce GT 340		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 information (counted in MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.