Radeon HD 4850 X2 1GB vs Radeon R9 270X

Intro

Compare those specifications to the Radeon R9 270X, which has clock speeds of 1000 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X		180 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 70 Watts (39%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 270X should perform a lot faster than the Radeon HD 4850 X2 1GB overall. (explain)

Radeon R9 270X		179200 MB/sec
Radeon HD 4850 X2 1GB		127104 MB/sec
	Difference: 52096 (41%)

Texel Rate

The Radeon R9 270X is quite a bit (more or less 60%) better at anisotropic filtering than the Radeon HD 4850 X2 1GB. (explain)

Radeon R9 270X		80000 Mtexels/sec
Radeon HD 4850 X2 1GB		50000 Mtexels/sec
	Difference: 30000 (60%)

Pixel Rate

The Radeon R9 270X should be quite a bit (more or less 60%) better at FSAA than the Radeon HD 4850 X2 1GB, and capable of handling higher resolutions better. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon HD 4850 X2 1GB		20000 Mpixels/sec
	Difference: 12000 (60%)

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 (in units of MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 are applied per second. This is calculated by multiplying the total texture units by the core clock 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.