Radeon HD 4830 1GB vs Radeon R9 270

Intro

Compare that to the Radeon R9 270, which uses a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM runs at a frequency of 1400 MHz on this specific model. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
Radeon R9 270		150 Watts
	Difference: 55 Watts (58%)

Memory Bandwidth

In theory, the Radeon R9 270 should perform quite a bit faster than the Radeon HD 4830 1GB in general. (explain)

Radeon R9 270		179200 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 121600 (211%)

Texel Rate

The Radeon R9 270 should be a lot (approximately 291%) faster with regards to anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon R9 270		72000 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 53600 (291%)

Pixel Rate

The Radeon R9 270 will be a lot (more or less 213%) more effective at anti-aliasing than the Radeon HD 4830 1GB, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 19600 (213%)

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 past the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 get to the maximum fill rate.