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Radeon RX 5700 XT vs Radeon RX Vega 56

Intro

The Radeon RX 5700 XT comes with a core clock frequency of 1605 MHz and a GDDR6 memory frequency of 14000 MHz. It also makes use of a 256-bit memory bus, and uses a 7 nm design. It features 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Compare that to the Radeon RX Vega 56, which has a clock speed of 1156 MHz and a HBM2 memory speed of 1600 MHz. It also uses a 2048-bit memory bus, and makes use of a 14 nm design. It is made up of 3584 SPUs, 224 Texture Address Units, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX Vega 56		210 Watts
Radeon RX 5700 XT		225 Watts
	Difference: 15 Watts (7%)

Memory Bandwidth

Theoretically, the Radeon RX 5700 XT should be a bit faster than the Radeon RX Vega 56 in general. (explain)

Radeon RX 5700 XT		458752 MB/sec
Radeon RX Vega 56		419430 MB/sec
	Difference: 39322 (9%)

Texel Rate

The Radeon RX Vega 56 will be just a bit (approximately 1%) better at AF than the Radeon RX 5700 XT. (explain)

Radeon RX Vega 56		258944 Mtexels/sec
Radeon RX 5700 XT		256800 Mtexels/sec
	Difference: 2144 (1%)

Pixel Rate

The Radeon RX 5700 XT is quite a bit (approximately 39%) faster with regards to FSAA than the Radeon RX Vega 56, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon RX 5700 XT		102720 Mpixels/sec
Radeon RX Vega 56		73984 Mpixels/sec
	Difference: 28736 (39%)

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 RX 5700 XT

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Radeon RX Vega 56

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Specifications

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Model	Radeon RX 5700 XT	Radeon RX Vega 56
Manufacturer	AMD	AMD
Year	July 2019	September 2017
Code Name	Navi 10	Vega 10 XL
Memory	8096 MB	8192 MB
Core Speed	1605 MHz	1156 MHz
Memory Speed	14000 GB/s	1600 MHz
Power (Max TDP)	225 watts	210 watts
Bandwidth	458752 MB/sec	419430 MB/sec
Texel Rate	256800 Mtexels/sec	258944 Mtexels/sec
Pixel Rate	102720 Mpixels/sec	73984 Mpixels/sec
Unified Shaders	2560	3584
Texture Mapping Units	160	224
Render Output Units	64	64
Bus Type	GDDR6	HBM2
Bus Width	256-bit	2048-bit
Fab Process	7 nm	14 nm
Transistors	10300 million	12500 million
Bus	PCIe 4.0 ×16	PCIe 3.0 x16
DirectX Version	DirectX 12	DirectX 12.0
OpenGL Version	OpenGL 4.6	OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 processed per second. This number is calculated by multiplying the total texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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