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

Intro

Compare those specs 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 TAUs 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		108 Watts
	Difference: 77 Watts (248%)

Memory Bandwidth

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

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

Texel Rate

The Radeon HD 6770 should be quite a bit (about 500%) more effective at AF than the Radeon HD 6450 (OEM) 1GB. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6770 is the winner, and very much so. (explain)

Radeon HD 6770		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 largest amount of information (in units of MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core 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 most pixels that the graphics chip could possibly write 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 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 rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.