Radeon R7 250X 2GB vs Radeon R9 390X 8G

Intro

Compare all that to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has clocked the core frequency at 1050 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this model. It features 2816 SPUs along with 176 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 180 Watts (189%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G should be quite a bit faster than the Radeon R7 250X 2GB overall. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 312000 (433%)

Texel Rate

The Radeon R9 390X 8G is much (approximately 362%) faster with regards to AF than the Radeon R7 250X 2GB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 144800 (362%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 390X 8G is the winner, by far. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 51200 (320%)

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 transferred across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.