Radeon HD 4750 vs Radeon R9 270X

Intro

Compare those specifications to the Radeon R9 270X, which features GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM set to run at 1400 MHz through a 256-bit bus. It also features 1280 Stream Processors, 80 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon R9 270X		180 Watts
	Difference: 105 Watts (140%)

Memory Bandwidth

In theory, the Radeon R9 270X should be 250% quicker than the Radeon HD 4750 overall, because of its higher data rate. (explain)

Radeon R9 270X		179200 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 128000 (250%)

Texel Rate

The Radeon R9 270X should be much (more or less 242%) faster with regards to texture filtering than the Radeon HD 4750. (explain)

Radeon R9 270X		80000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 56640 (242%)

Pixel Rate

The Radeon R9 270X should be much (about 174%) more effective at AA than the Radeon HD 4750, and also should be capable of handling higher screen resolutions better. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 20320 (174%)

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 max amount of information (counted in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video 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 number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.