Radeon HD 4750 vs Radeon R9 M270X

Intro

Compare those specifications to the Radeon R9 M270X, which comes with GPU core speed of 725 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M270X will be 41% faster than the Radeon HD 4750 in general, due to its greater bandwidth. (explain)

Radeon R9 M270X		72000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 20800 (41%)

Texel Rate

The Radeon R9 M270X is quite a bit (more or less 24%) faster with regards to AF than the Radeon HD 4750. (explain)

Radeon R9 M270X		29000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 5640 (24%)

Pixel Rate

The Radeon HD 4750 should be a small bit (approximately 1%) faster with regards to anti-aliasing than the Radeon R9 M270X, and should be capable of handling higher screen resolutions better. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 80 (1%)

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 (measured in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at 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 chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.