GeForce GT 640 DDR3 vs Radeon RX 5500

Intro

Compare all that to the Radeon RX 5500, which makes use of a 7 nm design. AMD has set the core frequency at 1670 MHz. The GDDR6 memory works at a frequency of 1750 MHz on this specific model. It features 1408 SPUs along with 88 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon RX 5500		150 Watts
	Difference: 85 Watts (131%)

Memory Bandwidth

The Radeon RX 5500 should theoretically be a lot faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon RX 5500		229376 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 172352 (302%)

Texel Rate

The Radeon RX 5500 is a lot (more or less 410%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon RX 5500		146960 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 118160 (410%)

Pixel Rate

The Radeon RX 5500 is a lot (about 271%) better at anti-aliasing than the GeForce GT 640 DDR3, and also should be able to handle higher resolutions better. (explain)

Radeon RX 5500		53440 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 39040 (271%)

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: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.