GeForce GTS 450 vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which uses a 55 nm design. AMD has set the core speed at 575 MHz. The GDDR4 RAM is set to run at a speed of 900 MHz on this specific model. It features 640(128x5) SPUs as well as 32 TAUs 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 GTS 450		106 Watts
	Difference: 11 Watts (12%)

Memory Bandwidth

In theory, the GeForce GTS 450 should be 0% faster than the Radeon HD 4830 1GB overall, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce GTS 450 will be quite a bit (approximately 36%) faster with regards to anisotropic filtering than the Radeon HD 4830 1GB. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTS 450 is superior to the Radeon HD 4830 1GB, by far. (explain)

GeForce GTS 450		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: Bandwidth is the max amount of data (measured in MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.