Radeon HD 4790 vs Radeon R9 M280X

Intro

Compare that to the Radeon R9 M280X, which features a core clock speed of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It features 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790 should theoretically perform a small bit faster than the Radeon R9 M280X overall. (explain)

Radeon HD 4790		102400 MB/sec
Radeon R9 M280X		88000 MB/sec
	Difference: 14400 (16%)

Texel Rate

The Radeon R9 M280X is a lot (approximately 163%) more effective at AF than the Radeon HD 4790. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 31200 (163%)

Pixel Rate

The Radeon R9 M280X should be quite a bit (about 50%) better at AA than the Radeon HD 4790, and also will be able to handle higher resolutions more effectively. (explain)

Radeon R9 M280X		14400 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 4800 (50%)

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 largest amount of data (counted in megabytes per second) that can be transported over the external memory interface in a 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 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.