Radeon HD 4850 X2 512MB vs Radeon R9 M395X

Intro

Compare all of that to the Radeon R9 M395X, which comes with GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 4850 X2 512MB		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M395X should be 26% faster than the Radeon HD 4850 X2 512MB in general, due to its greater bandwidth. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 4850 X2 512MB		127104 MB/sec
	Difference: 32896 (26%)

Texel Rate

The Radeon R9 M395X is a lot (approximately 85%) faster with regards to AF than the Radeon HD 4850 X2 512MB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4850 X2 512MB		50000 Mtexels/sec
	Difference: 42544 (85%)

Pixel Rate

The Radeon R9 M395X will be a little bit (more or less 16%) better at anti-aliasing than the Radeon HD 4850 X2 512MB, and should be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 4850 X2 512MB		20000 Mpixels/sec
	Difference: 3136 (16%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed 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 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 maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.