Radeon HD 5450 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which has clock speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 memory. It features 800 SPUs as well as 40 Texture Address Units and 16 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 6770		108 Watts
	Difference: 89 Watts (468%)

Memory Bandwidth

In theory, the Radeon HD 6770 should be 425% faster than the Radeon HD 5450 in general, because of its greater data rate. (explain)

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

Texel Rate

The Radeon HD 6770 will be a lot (more or less 592%) better at AF than the Radeon HD 5450. (explain)

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

Pixel Rate

The Radeon HD 6770 is a lot (about 454%) better at full screen anti-aliasing than the Radeon HD 5450, and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6770		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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.