Radeon HD 4670 1GB vs Radeon HD 5450

Intro

Compare all that to the Radeon HD 5450, which has GPU clock speed of 650 MHz, and 512 MB of DDR3 RAM running at 800 MHz through a 64-bit bus. It also is comprised of 80(16x5) Stream Processors, 8 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 4670 1GB		70 Watts
	Difference: 51 Watts (268%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 1GB should in theory be quite a bit superior to the Radeon HD 5450 overall. (explain)

Radeon HD 4670 1GB		35200 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 22400 (175%)

Texel Rate

The Radeon HD 4670 1GB should be quite a bit (approximately 362%) better at anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 18800 (362%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4670 1GB is a better choice, by a large margin. (explain)

Radeon HD 4670 1GB		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 largest amount of data (counted in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.