Radeon HD 4670 1GB vs Radeon HD 5450

Intro

Compare those specs to the Radeon HD 5450, which has a clock frequency of 650 MHz and a DDR3 memory speed of 800 MHz. It also makes use of a 64-bit bus, and makes use of a 40 nm design. It is comprised 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 1GB		70 Watts
	Difference: 51 Watts (268%)

Memory Bandwidth

In theory, the Radeon HD 4670 1GB is 175% faster than the Radeon HD 5450 overall, due to its greater bandwidth. (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 (about 362%) more effective 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

The Radeon HD 4670 1GB is much (more or less 131%) better at full screen anti-aliasing than the Radeon HD 5450, and also capable of handling higher resolutions better. (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 megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses 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, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.