Radeon HD 5450 vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which has a clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 89 Watts (468%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB should perform quite a bit faster than the Radeon HD 5450 in general. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 54400 (425%)

Texel Rate

The Radeon HD 6770 1GB is a lot (approximately 592%) faster with regards to anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 30800 (592%)

Pixel Rate

The Radeon HD 6770 1GB should be a lot (more or less 454%) more effective at full screen anti-aliasing than the Radeon HD 5450, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 11800 (454%)

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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics 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 write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.