GeForce GTX 480 vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which comes with GPU clock speed of 750 MHz, and 512 MB of GDDR5 RAM set to run at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

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

As far as performance goes, the GeForce GTX 480 should in theory be a lot better 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 a lot (about 75%) better at anisotropic filtering 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 should be a lot (approximately 180%) more effective at full screen anti-aliasing than the Radeon HD 4770, and also should be capable of handling 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: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.