GeForce GT 640 DDR3 vs Radeon RX 6600

Intro

Compare that to the Radeon RX 6600, which comes with a GPU core clock speed of 1626 MHz, and 8192 MB of GDDR6 memory running at 1750 MHz through a 128-bit bus. It also is comprised of 1792 SPUs, 112 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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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 speaking, the Radeon RX 6600 should perform a lot faster than the GeForce GT 640 DDR3 in general. (explain)

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

Texel Rate

The Radeon RX 6600 is quite a bit (more or less 532%) more effective at AF 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

The Radeon RX 6600 will be much (about 623%) more effective at anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher resolutions without slowing down too much. (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

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 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 clock speed of the chip. The higher this number, the better the video 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 the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. 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 many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.