Radeon HD 4830 512MB vs Radeon R9 M380

Intro

Compare that to the Radeon R9 M380, which makes use of a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this card. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M380 should in theory perform quite a bit faster than the Radeon HD 4830 512MB overall. (explain)

Radeon R9 M380		96000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 38400 (67%)

Texel Rate

The Radeon R9 M380 is much (approximately 117%) better at AF than the Radeon HD 4830 512MB. (explain)

Radeon R9 M380		40000 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 21600 (117%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 M380 is superior to the Radeon HD 4830 512MB, by a large margin. (explain)

Radeon R9 M380		16000 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 6800 (74%)

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 data (counted in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure 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 number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.