Radeon HD 4830 512MB vs Radeon R9 270X

Intro

Compare that to the Radeon R9 270X, which has a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1400 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is made up of 1280 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
Radeon R9 270X		180 Watts
	Difference: 85 Watts (89%)

Memory Bandwidth

In theory, the Radeon R9 270X is 211% quicker than the Radeon HD 4830 512MB overall, due to its greater bandwidth. (explain)

Radeon R9 270X		179200 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 121600 (211%)

Texel Rate

The Radeon R9 270X will be quite a bit (approximately 335%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon R9 270X		80000 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 61600 (335%)

Pixel Rate

The Radeon R9 270X will be quite a bit (about 248%) more effective at AA than the Radeon HD 4830 512MB, and will be able to handle higher resolutions better. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 22800 (248%)

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 maximum amount of data (in units of MB per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.