Radeon HD 6790 vs Radeon R9 M265X

Intro

Compare all that to the Radeon R9 M265X, which comes with a core clock frequency 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 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 6790 should be a lot faster than the Radeon R9 M265X in general. (explain)

Radeon HD 6790		134400 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 62400 (87%)

Texel Rate

The Radeon HD 6790 will be much (more or less 46%) faster with regards to anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 10600 (46%)

Pixel Rate

The Radeon HD 6790 should be a lot (about 46%) better at full screen anti-aliasing than the Radeon R9 M265X, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 4240 (46%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, 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 amount of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.