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

Intro

The Radeon R7 250X 2GB has clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon R9 390 8G, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 512-bit bus, and uses a 28 nm design. It features 2560 SPUs, 160 TAUs, and 64 ROPs.

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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

Performance-wise, the Radeon R9 390 8G should in theory be quite a bit superior to 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 quite a bit (about 300%) better at 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

If running with lots of anti-aliasing is important to you, then the Radeon R9 390 8G is the winner, by a large margin. (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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock 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 memory bandwidth is, the lower the potential to reach 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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