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GeForce GT 640 DDR3 vs Radeon RX 6600

Intro

The GeForce GT 640 DDR3 makes use of a 28 nm design. nVidia has clocked the core speed at 900 MHz. The DDR3 memory works at a frequency of 1782 MHz on this specific card. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

Compare those specifications to the Radeon RX 6600, which features core speeds of 1626 MHz on the GPU, and 1750 MHz on the 8192 MB of GDDR6 memory. It features 1792 SPUs as well as 112 Texture Address Units and 64 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon RX 6600 132 Watts
Difference: 67 Watts (103%)

Memory Bandwidth

Theoretically, the Radeon RX 6600 should perform much faster than the GeForce GT 640 DDR3 overall. (explain)

Radeon RX 6600 229376 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 172352 (302%)

Texel Rate

The Radeon RX 6600 should be quite a bit (approximately 532%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon RX 6600 182112 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 153312 (532%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 6600 is superior to the GeForce GT 640 DDR3, by far. (explain)

Radeon RX 6600 104064 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 89664 (623%)

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 GT 640 DDR3

Amazon.com

Check prices at:

Radeon RX 6600

Amazon.com

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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 GeForce GT 640 DDR3 Radeon RX 6600
Manufacturer nVidia AMD
Year June 2012 October 2021
Code Name GK107 Navi 23
Memory 2048 MB 8192 MB
Core Speed 900 MHz 1626 MHz
Memory Speed 3564 MHz 3500 GB/s
Power (Max TDP) 65 watts 132 watts
Bandwidth 57024 MB/sec 229376 MB/sec
Texel Rate 28800 Mtexels/sec 182112 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 104064 Mpixels/sec
Unified Shaders 384 1792
Texture Mapping Units 32 112
Render Output Units 16 64
Bus Type DDR3 GDDR6
Bus Width 128-bit 128-bit
Fab Process 28 nm 7 nm
Transistors 1300 million 11060 million
Bus PCIe 3.0 x16 PCIe 4.0 x16
DirectX Version DirectX 11.0 DirectX 12
OpenGL Version OpenGL 4.2 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR 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 calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon RX 6600

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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