Radeon HD 5450 vs Radeon HD 5770

Intro

Compare those specifications to the Radeon HD 5770, which uses a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this particular card. It features 800(160x5) SPUs as well as 40 TAUs 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 5770		108 Watts
	Difference: 89 Watts (468%)

Memory Bandwidth

The Radeon HD 5770, in theory, should be quite a bit faster than the Radeon HD 5450 in general. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 64000 (500%)

Texel Rate

The Radeon HD 5770 should be a lot (more or less 554%) better at anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 28800 (554%)

Pixel Rate

The Radeon HD 5770 will be quite a bit (approximately 423%) better at FSAA than the Radeon HD 5450, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 11000 (423%)

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 max amount of information (measured in megabytes per second) that can be transported across 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 RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock 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 a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.