Radeon HD 4750 vs Radeon R9 390X 8G

Intro

Compare that to the Radeon R9 390X 8G, which features a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 200 Watts (267%)

Memory Bandwidth

Performance-wise, the Radeon R9 390X 8G should in theory be a lot superior to the Radeon HD 4750 in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 332800 (650%)

Texel Rate

The Radeon R9 390X 8G will be quite a bit (more or less 691%) better at AF than the Radeon HD 4750. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 161440 (691%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 390X 8G is superior to the Radeon HD 4750, by a large margin. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 55520 (475%)

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 largest amount of data (measured in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that are applied per second. This 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 video 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 maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.