Radeon HD 4670 1GB vs Radeon HD 6870

Intro

Compare those specs to the Radeon HD 6870, which comes with a clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is comprised of 1120 SPUs, 56 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon HD 6870		151 Watts
	Difference: 81 Watts (116%)

Memory Bandwidth

The Radeon HD 6870 should theoretically be much faster than the Radeon HD 4670 1GB in general. (explain)

Radeon HD 6870		134400 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 99200 (282%)

Texel Rate

The Radeon HD 6870 should be much (approximately 110%) better at anisotropic filtering than the Radeon HD 4670 1GB. (explain)

Radeon HD 6870		50400 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 26400 (110%)

Pixel Rate

The Radeon HD 6870 is a lot (about 380%) faster with regards to anti-aliasing than the Radeon HD 4670 1GB, and will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 22800 (380%)

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 data (measured in MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 are applied per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the 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 most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.