Radeon HD 4770 vs Radeon HD 7750

Intro

Compare that to the Radeon HD 7750, which has GPU core speed of 800 MHz, and 1024 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is comprised of 512 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 4770		80 Watts
	Difference: 25 Watts (45%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 should perform quite a bit faster than the Radeon HD 4770 overall. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 20800 (41%)

Texel Rate

The Radeon HD 7750 should be just a bit (about 7%) faster with regards to AF than the Radeon HD 4770. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 1600 (7%)

Pixel Rate

The Radeon HD 7750 should be a little bit (more or less 7%) more effective at full screen anti-aliasing than the Radeon HD 4770, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 800 (7%)

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 data (counted in megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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