GeForce GTX 480 vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which uses a 40 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 memory works at a frequency of 800 MHz on this card. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 480		250 Watts
	Difference: 170 Watts (213%)

Memory Bandwidth

In theory, the GeForce GTX 480 should be a lot faster than the Radeon HD 4770 in general. (explain)

GeForce GTX 480		177408 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 126208 (247%)

Texel Rate

The GeForce GTX 480 will be quite a bit (approximately 75%) better at AF than the Radeon HD 4770. (explain)

GeForce GTX 480		42000 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 18000 (75%)

Pixel Rate

The GeForce GTX 480 will be a lot (about 180%) better at full screen anti-aliasing than the Radeon HD 4770, and also able to handle higher screen resolutions better. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 21600 (180%)

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 information (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.