Radeon HD 4750 vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which features GPU 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 Stream Processors, 176 TAUs, and 64 Raster Operation Units.

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

As far as performance goes, 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 is a lot (about 691%) more effective 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

The Radeon R9 390X 8G will be quite a bit (more or less 475%) more effective at anti-aliasing than the Radeon HD 4750, and will be capable of handling higher screen resolutions without losing too much performance. (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 max amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.