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

Intro

Compare that to the Radeon HD 4830 1GB, which has a core clock speed of 575 MHz and a GDDR4 memory frequency of 900 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 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

As far as performance goes, the GeForce GT 450 (OEM) should in theory be a lot superior to the Radeon HD 4830 1GB in general. (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 (approximately 3%) faster with regards to AF 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 a lot (about 106%) better at full screen anti-aliasing than the Radeon HD 4830 1GB, and also should be able to handle higher resolutions more effectively. (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 MB per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the 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 the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.