Radeon HD 4670 512MB vs Radeon HD 5450

Intro

Compare all that to the Radeon HD 5450, which comes with a clock frequency of 650 MHz and a DDR3 memory frequency of 800 MHz. It also makes use of a 64-bit bus, and uses a 40 nm design. It is made up of 80(16x5) SPUs, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 4670 512MB		70 Watts
	Difference: 51 Watts (268%)

Memory Bandwidth

The Radeon HD 4670 512MB should in theory be much faster than the Radeon HD 5450 overall. (explain)

Radeon HD 4670 512MB		32000 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 19200 (150%)

Texel Rate

The Radeon HD 4670 512MB is quite a bit (about 362%) better at AF than the Radeon HD 5450. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 18800 (362%)

Pixel Rate

The Radeon HD 4670 512MB will be quite a bit (about 131%) faster with regards to anti-aliasing than the Radeon HD 5450, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4670 512MB		6000 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 3400 (131%)

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 max amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.