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Radeon HD 7870 vs Radeon RX 6500 XT

Intro

The Radeon HD 7870 features core speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

Compare all that to the Radeon RX 6500 XT, which features a core clock speed of 2200 MHz and a GDDR6 memory frequency of 2250 MHz. It also uses a 64-bit memory bus, and uses a 6 nm design. It is comprised of 1024 SPUs, 64 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6500 XT 107 Watts
Radeon HD 7870 175 Watts
Difference: 68 Watts (64%)

Memory Bandwidth

In theory, the Radeon HD 7870 is 4% quicker than the Radeon RX 6500 XT overall, because of its greater bandwidth. (explain)

Radeon HD 7870 153600 MB/sec
Radeon RX 6500 XT 147456 MB/sec
Difference: 6144 (4%)

Texel Rate

The Radeon RX 6500 XT is a lot (approximately 76%) faster with regards to anisotropic filtering than the Radeon HD 7870. (explain)

Radeon RX 6500 XT 140800 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 60800 (76%)

Pixel Rate

The Radeon RX 6500 XT will be a lot (approximately 120%) more effective at FSAA than the Radeon HD 7870, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon RX 6500 XT 70400 Mpixels/sec
Radeon HD 7870 32000 Mpixels/sec
Difference: 38400 (120%)

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 HD 7870

Amazon.com

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Radeon RX 6500 XT

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 HD 7870 Radeon RX 6500 XT
Manufacturer AMD AMD
Year March 2012 January 2022
Code Name Pitcairn XT Navi 24 XT
Memory 2048 MB 4096 MB
Core Speed 1000 MHz 2200 MHz
Memory Speed 4800 MHz 4500 GB/s
Power (Max TDP) 175 watts 107 watts
Bandwidth 153600 MB/sec 147456 MB/sec
Texel Rate 80000 Mtexels/sec 140800 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 70400 Mpixels/sec
Unified Shaders 1280 1024
Texture Mapping Units 80 64
Render Output Units 32 32
Bus Type GDDR5 GDDR6
Bus Width 256-bit 64-bit
Fab Process 28 nm 6 nm
Transistors 2800 million 5400 million
Bus PCIe 3.0 x16 PCIe 4.0 x16
DirectX Version DirectX 11.1 DirectX 12
OpenGL Version OpenGL 4.2 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video 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 number of colour ROPs by the the core clock speed. 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 7870

Amazon.com

Check prices at:

Radeon RX 6500 XT

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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