Radeon HD 4830 1GB vs Radeon R9 270

Intro

Compare all of that to the Radeon R9 270, which has a GPU core clock speed of 900 MHz, and 2048 MB of GDDR5 RAM set to run at 1400 MHz through a 256-bit bus. It also is made up of 1280 Stream Processors, 80 Texture Address Units, 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

Performance-wise, the Radeon R9 270 should theoretically be much superior to the Radeon HD 4830 1GB overall. (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 much (about 291%) faster with regards to texture 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 should be quite a bit (more or less 213%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and will be able to handle higher resolutions while still performing well. (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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.