Radeon HD 4830 1GB vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which comes with a clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 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 M395X		125 Watts
	Difference: 30 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M395X will be 178% faster than the Radeon HD 4830 1GB overall, due to its greater bandwidth. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 102400 (178%)

Texel Rate

The Radeon R9 M395X should be quite a bit (about 403%) faster with regards to anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 74144 (403%)

Pixel Rate

The Radeon R9 M395X will be a lot (approximately 151%) faster with regards to AA than the Radeon HD 4830 1GB, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 M395X		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 information (measured in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.