GeForce GTS 450 vs Radeon HD 5670

Intro

Compare that to the Radeon HD 5670, which has a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is comprised of 400(80x5) Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
GeForce GTS 450		106 Watts
	Difference: 45 Watts (74%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5670 should be 11% faster than the GeForce GTS 450 in general, due to its higher data rate. (explain)

Radeon HD 5670		64000 MB/sec
GeForce GTS 450		57728 MB/sec
	Difference: 6272 (11%)

Texel Rate

The GeForce GTS 450 should be quite a bit (about 62%) more effective at anisotropic filtering than the Radeon HD 5670. (explain)

GeForce GTS 450		25056 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 9556 (62%)

Pixel Rate

The GeForce GTS 450 will be much (more or less 102%) better at AA than the Radeon HD 5670, and also should be capable of handling higher resolutions better. (explain)

GeForce GTS 450		12528 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 6328 (102%)

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 maximum amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at 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 that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.