Radeon HD 4770 vs Radeon HD 7750

Intro

Compare those specifications to the Radeon HD 7750, which comes with GPU core speed of 800 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is made up of 512 SPUs, 32 TAUs, and 16 ROPs.

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

As far as performance goes, the Radeon HD 7750 should theoretically be a lot superior to 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 a little bit (more or less 7%) more effective at 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 just a bit (about 7%) more effective at FSAA than the Radeon HD 4770, and able to handle higher resolutions without losing too much performance. (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 largest amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 can be applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out 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 drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.