Radeon HD 4670 1GB vs Radeon HD 7850

Intro

Compare those specifications to the Radeon HD 7850, which uses a 28 nm design. AMD has set the core frequency at 860 MHz. The GDDR5 RAM works at a frequency of 1200 MHz on this card. It features 1024 SPUs as well as 64 TAUs 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 7850		130 Watts
	Difference: 60 Watts (86%)

Memory Bandwidth

Theoretically, the Radeon HD 7850 should be much faster than the Radeon HD 4670 1GB in general. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 118400 (336%)

Texel Rate

The Radeon HD 7850 should be a lot (more or less 129%) more effective at anisotropic filtering than the Radeon HD 4670 1GB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 31040 (129%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7850 is a better choice, by far. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 21520 (359%)

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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's interface 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 higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.