GeForce GTS 450 1GB vs Radeon HD 5670

Intro

Compare all of that to the Radeon HD 5670, which comes with a clock speed of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is comprised of 400(80x5) SPUs, 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 1GB		106 Watts
	Difference: 45 Watts (74%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5670 should theoretically be a bit better than the GeForce GTS 450 1GB in general. (explain)

Radeon HD 5670		64000 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 6272 (11%)

Texel Rate

The GeForce GTS 450 1GB will be a lot (approximately 62%) faster with regards to anisotropic filtering than the Radeon HD 5670. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 9556 (62%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTS 450 1GB is a better choice, and very much so. (explain)

GeForce GTS 450 1GB		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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total amount 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 processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs 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 output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.