GeForce GTS 450 1GB vs Radeon HD 4830 512MB

Intro

Compare those specs to the Radeon HD 4830 512MB, which has a GPU core clock speed of 575 MHz, and 512 MB of GDDR3 memory set to run at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 11 Watts (12%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 450 1GB is 0% faster than the Radeon HD 4830 512MB in general, because of its greater data rate. (explain)

GeForce GTS 450 1GB		57728 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 128 (0%)

Texel Rate

The GeForce GTS 450 1GB is a lot (about 36%) faster with regards to texture filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 6656 (36%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTS 450 1GB is superior to the Radeon HD 4830 512MB, and very much so. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
Radeon HD 4830 512MB		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 transferred across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.