Radeon HD 5750 1GB vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which has a clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 5750 1GB		86 Watts
	Difference: 6 Watts (8%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5750 1GB is 2% quicker than the Radeon HD 7770 in general, due to its higher bandwidth. (explain)

Radeon HD 5750 1GB		73600 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 1600 (2%)

Texel Rate

The Radeon HD 7770 is a lot (more or less 59%) better at AF than the Radeon HD 5750 1GB. (explain)

Radeon HD 7770		40000 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 14800 (59%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7770 is a better choice, by far. (explain)

Radeon HD 7770		16000 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 4800 (43%)

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 largest amount of data (in units of MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 get to the max fill rate.