GeForce GTX 560 vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which comes with core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 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 560		150 Watts
	Difference: 70 Watts (88%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 560 will be 150% quicker than the Radeon HD 4770 overall, because of its greater bandwidth. (explain)

GeForce GTX 560		128128 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 76928 (150%)

Texel Rate

The GeForce GTX 560 will be quite a bit (approximately 89%) better at AF than the Radeon HD 4770. (explain)

GeForce GTX 560		45360 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 21360 (89%)

Pixel Rate

The GeForce GTX 560 will be quite a bit (about 116%) more effective at full screen anti-aliasing than the Radeon HD 4770, and should be capable of handling higher resolutions more effectively. (explain)

GeForce GTX 560		25920 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 13920 (116%)

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 max amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.