GeForce GTS 250 1GB vs Radeon HD 5670

Intro

Compare those specifications to the Radeon HD 5670, which has a core clock frequency of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 400(80x5) SPUs, 20 TAUs, 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 250 1GB		145 Watts
	Difference: 84 Watts (138%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 250 1GB will be 10% quicker than the Radeon HD 5670 overall, due to its greater data rate. (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 texture 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

If running with high levels of AA is important to you, then the GeForce GTS 250 1GB is a better choice, and very much so. (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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video 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 number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.