Radeon HD 4830 1GB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which features core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 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 1GB		95 Watts
Radeon R9 M390X		125 Watts
	Difference: 30 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M390X should be a lot faster than the Radeon HD 4830 1GB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 102400 (178%)

Texel Rate

The Radeon R9 M390X will be much (more or less 403%) faster with regards to anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 74144 (403%)

Pixel Rate

The Radeon R9 M390X will be much (approximately 151%) faster with regards to AA than the Radeon HD 4830 1GB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 4830 1GB		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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 applied in one second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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 potential to reach the max fill rate.