Radeon HD 4790 vs Radeon R7 M260X

Intro

Compare all of that to the Radeon R7 M260X, which comes with a clock frequency of 825 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 24 TAUs, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4790 should theoretically be much better than the Radeon R7 M260X overall. (explain)

Radeon HD 4790		102400 MB/sec
Radeon R7 M260X		64000 MB/sec
	Difference: 38400 (60%)

Texel Rate

The Radeon R7 M260X is a little bit (more or less 3%) more effective at AF than the Radeon HD 4790. (explain)

Radeon R7 M260X		19800 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 600 (3%)

Pixel Rate

The Radeon HD 4790 should be a lot (about 45%) faster with regards to FSAA than the Radeon R7 M260X, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4790		9600 Mpixels/sec
Radeon R7 M260X		6600 Mpixels/sec
	Difference: 3000 (45%)

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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses 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 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 applied in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at 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 the video card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.