GeForce 8800 GTS (G92) vs Radeon HD 4770

Intro

Compare all of that to the Radeon HD 4770, which makes use of a 40 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM is set to run at a frequency of 800 MHz on this specific model. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce 8800 GTS (G92)		135 Watts
	Difference: 55 Watts (69%)

Memory Bandwidth

Performance-wise, the GeForce 8800 GTS (G92) should in theory be quite a bit superior to the Radeon HD 4770 in general. (explain)

GeForce 8800 GTS (G92)		62080 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 10880 (21%)

Texel Rate

The GeForce 8800 GTS (G92) will be a lot (more or less 73%) faster with regards to texture filtering than the Radeon HD 4770. (explain)

GeForce 8800 GTS (G92)		41600 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 17600 (73%)

Pixel Rate

The Radeon HD 4770 should be a bit (approximately 15%) faster with regards to anti-aliasing than the GeForce 8800 GTS (G92), and will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce 8800 GTS (G92)		10400 Mpixels/sec
	Difference: 1600 (15%)

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 largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.