GeForce GTX 550 Ti vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which uses a 40 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory works at a speed of 800 MHz on this model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 550 Ti		116 Watts
	Difference: 36 Watts (45%)

Memory Bandwidth

The GeForce GTX 550 Ti, in theory, should be quite a bit faster than the Radeon HD 4770 overall. (explain)

GeForce GTX 550 Ti		98496 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 47296 (92%)

Texel Rate

The GeForce GTX 550 Ti will be a bit (more or less 20%) faster with regards to anisotropic filtering than the Radeon HD 4770. (explain)

GeForce GTX 550 Ti		28800 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 4800 (20%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 550 Ti is the winner, by far. (explain)

GeForce GTX 550 Ti		21600 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 9600 (80%)

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 maximum amount of data (measured in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 in one second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.