GeForce GTS 450 1GB vs Radeon HD 4830 1GB

Intro

Compare that to the Radeon HD 4830 1GB, which uses a 55 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR4 RAM works at a speed 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)

Radeon HD 4830 1GB		95 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 11 Watts (12%)

Memory Bandwidth

The GeForce GTS 450 1GB should in theory perform a little bit faster than the Radeon HD 4830 1GB in general. (explain)

GeForce GTS 450 1GB		57728 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 128 (0%)

Texel Rate

The GeForce GTS 450 1GB is much (more or less 36%) more effective at texture filtering than the Radeon HD 4830 1GB. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 6656 (36%)

Pixel Rate

The GeForce GTS 450 1GB is quite a bit (more or less 36%) more effective at AA than the Radeon HD 4830 1GB, and also able to handle higher screen resolutions more effectively. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 3328 (36%)

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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of texture units of the card 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 ability to reach the maximum fill rate.