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Radeon R9 295X2 vs Radeon RX 6800

Intro

The Radeon R9 295X2 comes with a GPU clock speed of 1018 MHz, and the 4096 MB of GDDR5 memory runs at 1250 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 TAUs, and 64 ROPs.

Compare those specs to the Radeon RX 6800, which comes with a core clock speed of 1700 MHz and a GDDR6 memory frequency of 2000 MHz. It also makes use of a 256-bit memory bus, and uses a 7 nm design. It is made up of 3840 SPUs, 240 Texture Address Units, and 96 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800 250 Watts
Radeon R9 295X2 500 Watts
Difference: 250 Watts (100%)

Memory Bandwidth

In theory, the Radeon R9 295X2 is 22% faster than the Radeon RX 6800 overall, because of its greater data rate. (explain)

Radeon R9 295X2 640000 MB/sec
Radeon RX 6800 524288 MB/sec
Difference: 115712 (22%)

Texel Rate

The Radeon RX 6800 will be a small bit (more or less 14%) better at AF than the Radeon R9 295X2. (explain)

Radeon RX 6800 408000 Mtexels/sec
Radeon R9 295X2 358336 Mtexels/sec
Difference: 49664 (14%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 6800 is the winner, by a large margin. (explain)

Radeon RX 6800 163200 Mpixels/sec
Radeon R9 295X2 130304 Mpixels/sec
Difference: 32896 (25%)

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

Check prices at:

Radeon RX 6800

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 R9 295X2 Radeon RX 6800
Manufacturer AMD AMD
Year April 2014 November 2020
Code Name Vesuvius Navi 21
Memory 4096 MB (x2) 16384 MB
Core Speed 1018 MHz (x2) 1700 MHz
Memory Speed 5000 MHz (x2) 4000 GB/s
Power (Max TDP) 500 watts 250 watts
Bandwidth 640000 MB/sec 524288 MB/sec
Texel Rate 358336 Mtexels/sec 408000 Mtexels/sec
Pixel Rate 130304 Mpixels/sec 163200 Mpixels/sec
Unified Shaders 2816 (x2) 3840
Texture Mapping Units 176 (x2) 240
Render Output Units 64 (x2) 96
Bus Type GDDR5 GDDR6
Bus Width 512-bit (x2) 256-bit
Fab Process 28 nm 7 nm
Transistors 6200 million 26800 million
Bus PCIe 3.0 x16 PCIe 4.0 x16
DirectX Version DirectX 11.2 DirectX 12
OpenGL Version OpenGL 4.3 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon R9 295X2

Amazon.com

Check prices at:

Radeon RX 6800

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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