GeForce 8800 GT 512MB vs Radeon HD 4670 512MB

Intro

Compare all of that to the Radeon HD 4670 512MB, which uses a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 RAM works at a speed of 1000 MHz on this card. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 35 Watts (50%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GT 512MB should be much faster than the Radeon HD 4670 512MB in general. (explain)

GeForce 8800 GT 512MB		57600 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 25600 (80%)

Texel Rate

The GeForce 8800 GT 512MB will be much (more or less 40%) faster with regards to texture filtering than the Radeon HD 4670 512MB. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 9600 (40%)

Pixel Rate

The GeForce 8800 GT 512MB should be quite a bit (more or less 60%) more effective at full screen anti-aliasing than the Radeon HD 4670 512MB, and capable of handling higher resolutions more effectively. (explain)

GeForce 8800 GT 512MB		9600 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 3600 (60%)

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 transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum 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 clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.