Radeon HD 6450 (OEM) 1GB vs Radeon HD 6770 1GB

Intro

Compare that to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this particular model. 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 6450 (OEM) 1GB		31 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 77 Watts (248%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB should perform much faster than the Radeon HD 6450 (OEM) 1GB in general. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 38400 (133%)

Texel Rate

The Radeon HD 6770 1GB is much (about 500%) better at anisotropic filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 30000 (500%)

Pixel Rate

The Radeon HD 6770 1GB will be a lot (more or less 380%) better at AA than the Radeon HD 6450 (OEM) 1GB, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 11400 (380%)

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 maximum amount of information (counted in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video 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 maximum number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.