Radeon HD 4830 512MB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
Radeon R9 M390X		125 Watts
	Difference: 30 Watts (32%)

Memory Bandwidth

Theoretically, the Radeon R9 M390X should perform a lot faster than the Radeon HD 4830 512MB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 102400 (178%)

Texel Rate

The Radeon R9 M390X will be much (approximately 403%) better at AF than the Radeon HD 4830 512MB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 74144 (403%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M390X is the winner, by far. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 13936 (151%)

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 within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.