Radeon HD 4670 512MB vs Radeon HD 7850

Intro

Compare those specs to the Radeon HD 7850, which uses a 28 nm design. AMD has set the core speed at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this specific 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 512MB		70 Watts
Radeon HD 7850		130 Watts
	Difference: 60 Watts (86%)

Memory Bandwidth

Performance-wise, the Radeon HD 7850 should in theory be quite a bit superior to the Radeon HD 4670 512MB overall. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 121600 (380%)

Texel Rate

The Radeon HD 7850 is a lot (more or less 129%) more effective at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 31040 (129%)

Pixel Rate

The Radeon HD 7850 will be quite a bit (more or less 359%) more effective at anti-aliasing than the Radeon HD 4670 512MB, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 4670 512MB		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 largest amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the 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 record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.