GeForce GT 340 1GB vs Radeon HD 4830 512MB

Intro

Compare those specifications to the Radeon HD 4830 512MB, which makes use of a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR3 memory is set to run at a frequency of 900 MHz on this specific card. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

The Radeon HD 4830 512MB should theoretically be just a bit faster than the GeForce GT 340 1GB overall. (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 will be a little bit (about 5%) more effective at AF 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

The Radeon HD 4830 512MB should be quite a bit (approximately 109%) more effective at AA than the GeForce GT 340 1GB, and also should be able to handle higher screen resolutions more effectively. (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 (in units of MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling 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 that the graphics card can possibly write to the local memory in one 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 called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.