Radeon HD 4850 X2 512MB vs Radeon R9 M270X

Intro

Compare those specifications to the Radeon R9 M270X, which features GPU clock speed of 725 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4850 X2 512MB should be quite a bit faster than the Radeon R9 M270X in general. (explain)

Radeon HD 4850 X2 512MB		127104 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 55104 (77%)

Texel Rate

The Radeon HD 4850 X2 512MB should be quite a bit (about 72%) better at texture filtering than the Radeon R9 M270X. (explain)

Radeon HD 4850 X2 512MB		50000 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 21000 (72%)

Pixel Rate

The Radeon HD 4850 X2 512MB is a lot (about 72%) faster with regards to AA than the Radeon R9 M270X, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB		20000 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 8400 (72%)

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 information (measured in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.