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Radeon R9 295X2 vs Radeon R9 390X 8G

Intro

The Radeon R9 295X2 comes with a core clock frequency of 1018 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 512-bit bus, and uses a 28 nm design. It is comprised of 2816 SPUs, 176 TAUs, and 64 ROPs.

Compare that to the Radeon R9 390X 8G, which has core speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs as well as 176 TAUs and 64 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 295X2 21205 points
Radeon R9 390X 8G 13555 points
Difference: 7650 (56%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 390X 8G 275 Watts
Radeon R9 295X2 500 Watts
Difference: 225 Watts (82%)

Memory Bandwidth

In theory, the Radeon R9 295X2 should be a lot faster than the Radeon R9 390X 8G overall. (explain)

Radeon R9 295X2 640000 MB/sec
Radeon R9 390X 8G 384000 MB/sec
Difference: 256000 (67%)

Texel Rate

The Radeon R9 295X2 will be a lot (more or less 94%) better at anisotropic filtering than the Radeon R9 390X 8G. (explain)

Radeon R9 295X2 358336 Mtexels/sec
Radeon R9 390X 8G 184800 Mtexels/sec
Difference: 173536 (94%)

Pixel Rate

The Radeon R9 295X2 should be much (about 94%) more effective at full screen anti-aliasing than the Radeon R9 390X 8G, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 295X2 130304 Mpixels/sec
Radeon R9 390X 8G 67200 Mpixels/sec
Difference: 63104 (94%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon R9 295X2

Amazon.com

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Radeon R9 390X 8G

Amazon.com

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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 R9 295X2 Radeon R9 390X 8G
Manufacturer AMD AMD
Year April 2014 June 2015
Code Name Vesuvius Grenada XT
Memory 4096 MB (x2) 8192 MB
Core Speed 1018 MHz (x2) 1050 MHz
Memory Speed 5000 MHz (x2) 6000 MHz
Power (Max TDP) 500 watts 275 watts
Bandwidth 640000 MB/sec 384000 MB/sec
Texel Rate 358336 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 130304 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 2816 (x2) 2816
Texture Mapping Units 176 (x2) 176
Render Output Units 64 (x2) 64
Bus Type GDDR5 GDDR5
Bus Width 512-bit (x2) 512-bit
Fab Process 28 nm 28 nm
Transistors 6200 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 maximum amount of data (counted in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the 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 amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 get to the maximum fill rate.

Display Prices

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Radeon R9 295X2

Amazon.com

Check prices at:

Radeon R9 390X 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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