GeForce GTS 250 1GB vs Radeon HD 5670

Intro

Compare all of 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 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
GeForce GTS 250 1GB		145 Watts
	Difference: 84 Watts (138%)

Memory Bandwidth

Theoretically, the GeForce GTS 250 1GB should be a bit faster than the Radeon HD 5670 in general. (explain)

GeForce GTS 250 1GB		70400 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 6400 (10%)

Texel Rate

The GeForce GTS 250 1GB is quite a bit (about 205%) better at anisotropic filtering than the Radeon HD 5670. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 31732 (205%)

Pixel Rate

The GeForce GTS 250 1GB will be quite a bit (approximately 90%) more effective at full screen anti-aliasing than the Radeon HD 5670, and will be capable of handling higher resolutions while still performing well. (explain)

GeForce GTS 250 1GB		11808 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 5608 (90%)

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 (measured in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 applied in one second. This is calculated by multiplying the total number of texture units of the card by the core clock 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 most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.