Radeon HD 5450 vs Radeon HD 7950

Intro

Compare all that to the Radeon HD 7950, which features a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 384-bit memory bus, and makes use of a 28 nm design. It is made up of 1792 SPUs, 112 TAUs, and 32 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 7950		200 Watts
	Difference: 181 Watts (953%)

Memory Bandwidth

In theory, the Radeon HD 7950 should perform much faster than the Radeon HD 5450 in general. (explain)

Radeon HD 7950		240000 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 227200 (1775%)

Texel Rate

The Radeon HD 7950 is much (about 1623%) faster with regards to anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 7950		89600 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 84400 (1623%)

Pixel Rate

The Radeon HD 7950 should be quite a bit (more or less 885%) faster with regards to anti-aliasing than the Radeon HD 5450, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 23000 (885%)

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 maximum amount of information (measured in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.