Radeon HD 4830 512MB vs Radeon HD 7950

Intro

Compare that to the Radeon HD 7950, which has GPU clock speed of 800 MHz, and 1536 MB of GDDR5 memory running at 1250 MHz through a 384-bit bus. It also features 1792 Stream Processors, 112 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
Radeon HD 7950		200 Watts
	Difference: 105 Watts (111%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 should be 317% quicker than the Radeon HD 4830 512MB overall, because of its higher bandwidth. (explain)

Radeon HD 7950		240000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 182400 (317%)

Texel Rate

The Radeon HD 7950 is quite a bit (about 387%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 7950		89600 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 71200 (387%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7950 is the winner, by far. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 16400 (178%)

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 data (in units of megabytes per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.