Radeon HD 4850 X2 1GB vs Radeon R7 260X

Intro

Compare those specifications to the Radeon R7 260X, which uses a 28 nm design. AMD has set the core frequency at 1100 MHz. The GDDR5 RAM runs at a frequency of 1625 MHz on this particular card. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 260X		115 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 135 Watts (117%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB should perform much faster than the Radeon R7 260X overall. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
Radeon R7 260X		104000 MB/sec
	Difference: 23104 (22%)

Texel Rate

The Radeon R7 260X will be much (approximately 23%) better at AF than the Radeon HD 4850 X2 1GB. (explain)

Radeon R7 260X		61600 Mtexels/sec
Radeon HD 4850 X2 1GB		50000 Mtexels/sec
	Difference: 11600 (23%)

Pixel Rate

The Radeon HD 4850 X2 1GB is a little bit (about 14%) faster with regards to FSAA than the Radeon R7 260X, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 1GB		20000 Mpixels/sec
Radeon R7 260X		17600 Mpixels/sec
	Difference: 2400 (14%)

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 largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the card will be at handling 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 chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.