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

Intro

The Radeon R7 250X 2GB comes with a GPU clock speed of 1000 MHz, and the 2048 MB of GDDR5 memory runs at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon R9 390 8G, which features GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 Texture Address Units, and 64 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon R9 390 8G should theoretically perform much faster than the Radeon R7 250X 2GB in general. (explain)

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

Texel Rate

The Radeon R9 390 8G is much (approximately 300%) faster with regards to anisotropic filtering than the Radeon R7 250X 2GB. (explain)

Radeon R9 390 8G 160000 Mtexels/sec
Radeon R7 250X 2GB 40000 Mtexels/sec
Difference: 120000 (300%)

Pixel Rate

The Radeon R9 390 8G will be much (more or less 300%) faster with regards to anti-aliasing than the Radeon R7 250X 2GB, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon R9 390 8G 64000 Mpixels/sec
Radeon R7 250X 2GB 16000 Mpixels/sec
Difference: 48000 (300%)

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

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Radeon R7 250X 2GB

Amazon.com

Check prices at:

Radeon R9 390 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon R7 250X 2GB Radeon R9 390 8G
Manufacturer AMD AMD
Year February 2014 June 2015
Code Name Cape Verde XT Grenada PRO
Memory 2048 MB 8192 MB
Core Speed 1000 MHz 1000 MHz
Memory Speed 4500 MHz 6000 MHz
Power (Max TDP) 95 watts 275 watts
Bandwidth 72000 MB/sec 384000 MB/sec
Texel Rate 40000 Mtexels/sec 160000 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 640 2560
Texture Mapping Units 40 160
Render Output Units 16 64
Bus Type GDDR5 GDDR5
Bus Width 128-bit 512-bit
Fab Process 28 nm 28 nm
Transistors 1500 million 6200 million
Bus PCIe 3.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 11.2 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB 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 clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon R7 250X 2GB

Amazon.com

Check prices at:

Radeon R9 390 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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