Radeon HD 5830 vs Radeon HD 7850

Intro

Compare all that to the Radeon HD 7850, which has a clock speed of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 256-bit bus, and uses a 28 nm design. It 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 7850		130 Watts
Radeon HD 5830		175 Watts
	Difference: 45 Watts (35%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7850 should in theory be just a bit better than the Radeon HD 5830 overall. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 5830		128000 MB/sec
	Difference: 25600 (20%)

Texel Rate

The Radeon HD 7850 will be a lot (more or less 23%) faster with regards to texture filtering than the Radeon HD 5830. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 5830		44800 Mtexels/sec
	Difference: 10240 (23%)

Pixel Rate

The Radeon HD 7850 will be quite a bit (more or less 115%) faster with regards to AA than the Radeon HD 5830, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 5830		12800 Mpixels/sec
	Difference: 14720 (115%)

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 megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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