Radeon HD 4750 vs Radeon R7 250X

Intro

Compare those specifications to the Radeon R7 250X, which comes with a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon R7 250X		95 Watts
	Difference: 20 Watts (27%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250X should be 41% quicker than the Radeon HD 4750 in general, due to its greater data rate. (explain)

Radeon R7 250X		72000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 20800 (41%)

Texel Rate

The Radeon R7 250X should be quite a bit (about 71%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

Radeon R7 250X		40000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 16640 (71%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R7 250X is superior to the Radeon HD 4750, by a large margin. (explain)

Radeon R7 250X		16000 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 4320 (37%)

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 maximum amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. 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 bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.