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GeForce RTX 3070 vs GeForce RTX 3080

Intro

The GeForce RTX 3070 makes use of a 8 nm design. nVidia has set the core frequency at 1500 MHz. The GDDR6 RAM works at a frequency of 1750 MHz on this specific model. It features 5888 SPUs as well as 184 Texture Address Units and 96 ROPs.

Compare all that to the GeForce RTX 3080, which has a core clock speed of 1440 MHz and a GDDR6X memory frequency of 1188 MHz. It also features a 320-bit bus, and uses a 8 nm design. It is comprised of 8704 SPUs, 272 Texture Address Units, and 96 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce RTX 3070		220 Watts
GeForce RTX 3080		320 Watts
	Difference: 100 Watts (45%)

Memory Bandwidth

The GeForce RTX 3080, in theory, should perform a bit faster than the GeForce RTX 3070 in general. (explain)

GeForce RTX 3080		778547 MB/sec
GeForce RTX 3070		(Unknown) MB/sec
	Difference: 778547 (-100%)

Texel Rate

The GeForce RTX 3080 will be a lot (about 42%) better at anisotropic filtering than the GeForce RTX 3070. (explain)

GeForce RTX 3080		391680 Mtexels/sec
GeForce RTX 3070		276000 Mtexels/sec
	Difference: 115680 (42%)

Pixel Rate

If using a high resolution is important to you, then the GeForce RTX 3070 is the winner, but only just. (explain)

GeForce RTX 3070		144000 Mpixels/sec
GeForce RTX 3080		138240 Mpixels/sec
	Difference: 5760 (4%)

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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GeForce RTX 3070

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GeForce RTX 3080

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Specifications

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Model	GeForce RTX 3070	GeForce RTX 3080
Manufacturer	nVidia	nVidia
Year	October 2020	September 2020
Code Name	Ampere GA104-300-A1	Ampere GA102-200-KD-A1
Memory	8192 MB	10240 MB
Core Speed	1500 MHz	1440 MHz
Memory Speed	1750 GB/s	1188 GB/s
Power (Max TDP)	220 watts	320 watts
Bandwidth	(Unknown) MB/sec	778547 MB/sec
Texel Rate	276000 Mtexels/sec	391680 Mtexels/sec
Pixel Rate	144000 Mpixels/sec	138240 Mpixels/sec
Unified Shaders	5888	8704
Texture Mapping Units	184	272
Render Output Units	96	96
Bus Type	GDDR6	GDDR6X
Bus Width	256-bit	320-bit
Fab Process	8 nm	8 nm
Transistors	17400 million	28300 million
Bus	PCIe 4.0 x16	PCIe 4.0 x16
DirectX Version	DirectX 12	DirectX 12
OpenGL Version	OpenGL 4.6	OpenGL 4.6

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount 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 amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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