Radeon HD 4850 X2 1GB vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which uses a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this particular card. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 200 Watts (400%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB should be much faster than the Radeon R9 M275X in general. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 55104 (77%)

Texel Rate

The Radeon HD 4850 X2 1GB is a lot (more or less 39%) faster with regards to anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon HD 4850 X2 1GB		50000 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 14000 (39%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4850 X2 1GB is superior to the Radeon R9 M275X, by far. (explain)

Radeon HD 4850 X2 1GB		20000 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 5600 (39%)

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 maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per 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 - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.