GeForce GTS 450 1GB vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which comes with a core clock speed of 575 MHz and a GDDR4 memory frequency of 900 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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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

Theoretically speaking, the GeForce GTS 450 1GB should be a small bit faster than the Radeon HD 4830 1GB overall. (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 will be quite a bit (approximately 36%) more effective at AF 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

If using high levels of AA is important to you, then the GeForce GTS 450 1GB is a better choice, by far. (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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.