Radeon HD 4850 X2 512MB vs Radeon R9 M295X

Intro

Compare those specifications to the Radeon R9 M295X, which has a core clock speed of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It features 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 R9 M295X		125 Watts
Radeon HD 4850 X2 512MB		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Theoretically, the Radeon R9 M295X should perform much faster than the Radeon HD 4850 X2 512MB overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 4850 X2 512MB		127104 MB/sec
	Difference: 48896 (38%)

Texel Rate

The Radeon R9 M295X is quite a bit (approximately 92%) faster with regards to anisotropic filtering than the Radeon HD 4850 X2 512MB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 4850 X2 512MB		50000 Mtexels/sec
	Difference: 46000 (92%)

Pixel Rate

The Radeon R9 M295X is a bit (about 20%) better at anti-aliasing than the Radeon HD 4850 X2 512MB, and also should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 4850 X2 512MB		20000 Mpixels/sec
	Difference: 4000 (20%)

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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 max fill rate.