Radeon HD 3850 X2 vs Radeon R9 M265X

Intro

Compare all of that to the Radeon R9 M265X, which features a core clock speed of 575 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3850 X2 should be 47% faster than the Radeon R9 M265X overall, due to its higher bandwidth. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 33984 (47%)

Texel Rate

The Radeon R9 M265X will be just a bit (more or less 8%) more effective at texture filtering than the Radeon HD 3850 X2. (explain)

Radeon R9 M265X		23000 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 1624 (8%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3850 X2 is superior to the Radeon R9 M265X, and very much so. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 12176 (132%)

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 max amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.