GeForce 8800 GT 1GB vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which has a core clock speed of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, 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 GT 1GB		105 Watts
	Difference: 25 Watts (31%)

Memory Bandwidth

In theory, the GeForce 8800 GT 1GB should be 13% quicker than the Radeon HD 4770 in general, because of its greater data rate. (explain)

GeForce 8800 GT 1GB		57600 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The GeForce 8800 GT 1GB is a lot (more or less 40%) faster with regards to anisotropic filtering than the Radeon HD 4770. (explain)

GeForce 8800 GT 1GB		33600 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 9600 (40%)

Pixel Rate

The Radeon HD 4770 should be much (more or less 25%) faster with regards to AA than the GeForce 8800 GT 1GB, and will be able to handle higher resolutions better. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce 8800 GT 1GB		9600 Mpixels/sec
	Difference: 2400 (25%)

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 information (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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