Radeon HD 5670 vs Radeon HD 7870

Intro

Compare those specifications to the Radeon HD 7870, which has a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 7870		175 Watts
	Difference: 114 Watts (187%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 should be a lot faster than the Radeon HD 5670 overall. (explain)

Radeon HD 7870		153600 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 7870 should be a lot (about 416%) faster with regards to texture filtering than the Radeon HD 5670. (explain)

Radeon HD 7870		80000 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 64500 (416%)

Pixel Rate

The Radeon HD 7870 should be quite a bit (more or less 416%) better at full screen anti-aliasing than the Radeon HD 5670, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 25800 (416%)

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 information (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses 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 high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units of the card by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.