Radeon HD 4850 2GB vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which features a clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB		110 Watts
Radeon R9 M395X		125 Watts
	Difference: 15 Watts (14%)

Memory Bandwidth

The Radeon R9 M395X, in theory, should perform much faster than the Radeon HD 4850 2GB overall. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 96448 (152%)

Texel Rate

The Radeon R9 M395X should be much (about 270%) more effective at anisotropic filtering than the Radeon HD 4850 2GB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 67544 (270%)

Pixel Rate

The Radeon R9 M395X will be quite a bit (more or less 131%) faster with regards to FSAA than the Radeon HD 4850 2GB, and should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 13136 (131%)

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 MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.