Radeon HD 4670 1GB vs Radeon HD 4850 512MB

Intro

Compare those specs to the Radeon HD 4850 512MB, which features clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 40 Watts (57%)

Memory Bandwidth

The Radeon HD 4850 512MB should theoretically perform a lot faster than the Radeon HD 4670 1GB in general. (explain)

Radeon HD 4850 512MB		63552 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 28352 (81%)

Texel Rate

The Radeon HD 4850 512MB will be a little bit (about 4%) better at AF than the Radeon HD 4670 1GB. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 1000 (4%)

Pixel Rate

The Radeon HD 4850 512MB will be quite a bit (about 67%) more effective at full screen anti-aliasing than the Radeon HD 4670 1GB, and able to handle higher resolutions more effectively. (explain)

Radeon HD 4850 512MB		10000 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 4000 (67%)

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 (measured in MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.