Radeon HD 4670 1GB vs Radeon HD 5450

Intro

Compare those specs to the Radeon HD 5450, which has a core clock frequency of 650 MHz and a DDR3 memory frequency of 800 MHz. It also makes use of a 64-bit bus, and makes use of a 40 nm design. It is made up of 80(16x5) SPUs, 8 Texture Address Units, 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

The Radeon HD 4670 1GB, in theory, should be a lot faster than the Radeon HD 5450 in general. (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 AF 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 running with a high resolution is important to you, then the Radeon HD 4670 1GB is the winner, 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 (measured in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video 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 number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.