Radeon HD 4830 512MB vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which features a GPU core clock speed of 1000 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is comprised of 2560 Stream Processors, 160 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
Radeon R9 390 8G		275 Watts
	Difference: 180 Watts (189%)

Memory Bandwidth

The Radeon R9 390 8G should in theory be quite a bit faster than the Radeon HD 4830 512MB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 326400 (567%)

Texel Rate

The Radeon R9 390 8G is much (more or less 770%) more effective at AF than the Radeon HD 4830 512MB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 141600 (770%)

Pixel Rate

The Radeon R9 390 8G will be a lot (more or less 596%) faster with regards to FSAA than the Radeon HD 4830 512MB, and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 54800 (596%)

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 largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, 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 this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.