GeForce GTX 480 vs Radeon HD 5770

Intro

Compare all that to the Radeon HD 5770, which has GPU core speed of 850 MHz, and 1024 MB of GDDR5 RAM running at 1200 MHz through a 128-bit bus. It also is comprised of 800(160x5) 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 5770		108 Watts
GeForce GTX 480		250 Watts
	Difference: 142 Watts (131%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 480 will be 131% quicker than the Radeon HD 5770 overall, because of its greater bandwidth. (explain)

GeForce GTX 480		177408 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 100608 (131%)

Texel Rate

The GeForce GTX 480 is a lot (about 24%) more effective at AF than the Radeon HD 5770. (explain)

GeForce GTX 480		42000 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 8000 (24%)

Pixel Rate

The GeForce GTX 480 is a lot (more or less 147%) faster with regards to anti-aliasing than the Radeon HD 5770, and also will be able to handle higher resolutions better. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 20000 (147%)

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 across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high 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 of the card by the core speed of the chip. The higher this number, the better the 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 most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends 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.