GeForce GT 450 (OEM) vs Radeon HD 4830 1GB

Intro

Compare all of that to the Radeon HD 4830 1GB, which comes with core speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 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)

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

Memory Bandwidth

In theory, the GeForce GT 450 (OEM) should be 67% faster than the Radeon HD 4830 1GB in general, because of its greater bandwidth. (explain)

GeForce GT 450 (OEM)		96000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 38400 (67%)

Texel Rate

The GeForce GT 450 (OEM) should be a little bit (about 3%) more effective at texture filtering than the Radeon HD 4830 1GB. (explain)

GeForce GT 450 (OEM)		18960 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 560 (3%)

Pixel Rate

The GeForce GT 450 (OEM) will be much (approximately 106%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 9760 (106%)

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 information (counted in megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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