GeForce 8800 GTS (G92) vs Radeon HD 4770

Intro

Compare all of that to the Radeon HD 4770, which has a GPU core clock speed of 750 MHz, and 512 MB of GDDR5 memory running at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 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

In theory, the GeForce 8800 GTS (G92) should perform much faster than 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) should be a lot (more or less 73%) more effective at anisotropic 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 little bit (more or less 15%) faster with regards to FSAA than the GeForce 8800 GTS (G92), and able to handle higher screen resolutions while still performing well. (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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.