GeForce 9800 GT 512MB vs Radeon HD 4670 1GB

Intro

Compare that to the Radeon HD 4670 1GB, which has GPU core speed of 750 MHz, and 1024 MB of GDDR4/GDDR3/DDR3/DDR2 memory set to run at 1100 MHz through a 128-bit bus. It also features 320(64x5) SPUs, 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 1GB		70 Watts
GeForce 9800 GT 512MB		105 Watts
	Difference: 35 Watts (50%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GT 512MB should in theory be quite a bit superior to the Radeon HD 4670 1GB overall. (explain)

GeForce 9800 GT 512MB		57600 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 22400 (64%)

Texel Rate

The GeForce 9800 GT 512MB is much (more or less 40%) more effective at AF than the Radeon HD 4670 1GB. (explain)

GeForce 9800 GT 512MB		33600 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 9600 (40%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 9800 GT 512MB is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

GeForce 9800 GT 512MB		9600 Mpixels/sec
Radeon HD 4670 1GB		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 (measured in megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.