Radeon HD 4750 vs Radeon R9 M280X

Intro

Compare those specs to the Radeon R9 M280X, which comes with a clock frequency of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Performance-wise, the Radeon R9 M280X should theoretically be much better than the Radeon HD 4750 overall. (explain)

Radeon R9 M280X		88000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 36800 (72%)

Texel Rate

The Radeon R9 M280X should be a lot (more or less 116%) faster with regards to anisotropic filtering than the Radeon HD 4750. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 27040 (116%)

Pixel Rate

The Radeon R9 M280X should be quite a bit (approximately 23%) better at AA than the Radeon HD 4750, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M280X		14400 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 2720 (23%)

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 MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, 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 AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.