Radeon HD 5450 vs Radeon HD 7850

Intro

Compare all that to the Radeon HD 7850, which features a clock frequency of 860 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is made up of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.

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

In theory, the Radeon HD 7850 is 1100% faster than the Radeon HD 5450 overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 7850 will be much (approximately 958%) more effective at anisotropic 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 (approximately 958%) faster with regards to AA than the Radeon HD 5450, and also should be capable of handling higher screen resolutions without losing too much performance. (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 across the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 are processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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