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Radeon HD 7870 vs Radeon RX 6500 XT

Intro

The Radeon HD 7870 comes with a GPU core speed of 1000 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

Compare those specs to the Radeon RX 6500 XT, which comes with core speeds of 2200 MHz on the GPU, and 2250 MHz on the 4096 MB of GDDR6 memory. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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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

Theoretically speaking, the Radeon HD 7870 is 4% faster than the Radeon RX 6500 XT in general, due to its higher data rate. (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 much (more or less 76%) more effective at 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 is much (more or less 120%) better at FSAA than the Radeon HD 7870, and also capable of handling higher screen resolutions while still performing well. (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

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.

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: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out 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 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 reach the max 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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