Radeon HD 4770 vs Radeon HD 6750 1GB

Intro

Compare all that to the Radeon HD 6750 1GB, which has a GPU core clock speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is made up of 720 Stream Processors, 36 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon HD 6750 1GB		86 Watts
	Difference: 6 Watts (8%)

Memory Bandwidth

The Radeon HD 6750 1GB, in theory, should be much faster than the Radeon HD 4770 overall. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The Radeon HD 6750 1GB will be a bit (more or less 9%) better at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 2100 (9%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4770 is superior to the Radeon HD 6750 1GB, but it probably won't make a huge difference. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 400 (3%)

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 information (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.