Radeon HD 4670 1GB vs Radeon HD 7850

Intro

Compare those specs to the Radeon HD 7850, which features a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 RAM set to run at 1200 MHz through a 256-bit bus. It also features 1024 SPUs, 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

In theory, the Radeon HD 7850 should be quite a bit 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 is quite a bit (more or less 129%) better at texture 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 running with a high screen 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: 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. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.