Radeon HD 4670 1GB vs Radeon HD 5570

Intro

Compare that to the Radeon HD 5570, which makes use of a 40 nm design. AMD has set the core speed at 650 MHz. The DDR3 memory works at a frequency of 900 MHz on this specific model. It features 400(80x5) SPUs along with 20 Texture Address Units and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 4670 1GB		70 Watts
	Difference: 27 Watts (63%)

Memory Bandwidth

In theory, the Radeon HD 4670 1GB should be 22% faster than the Radeon HD 5570 overall, because of its greater bandwidth. (explain)

Radeon HD 4670 1GB		35200 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 6400 (22%)

Texel Rate

The Radeon HD 4670 1GB will be a lot (about 85%) faster with regards to AF than the Radeon HD 5570. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 11000 (85%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4670 1GB is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 4670 1GB		6000 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 800 (15%)

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 max amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's 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 fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.