Radeon HD 5450 vs Radeon HD 7850

Intro

Compare that to the Radeon HD 7850, which comes with core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 7850		130 Watts
	Difference: 111 Watts (584%)

Memory Bandwidth

The Radeon HD 7850 should theoretically perform quite a bit faster than the Radeon HD 5450 overall. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 140800 (1100%)

Texel Rate

The Radeon HD 7850 is much (approximately 958%) better at texture filtering than the Radeon HD 5450. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 49840 (958%)

Pixel Rate

The Radeon HD 7850 is quite a bit (more or less 958%) better at full screen anti-aliasing than the Radeon HD 5450, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 24920 (958%)

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 largest amount of data (counted in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the 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 most pixels the video card could 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 colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.