GeForce GT 640 DDR3 vs Radeon RX 7900 XT

Intro

Compare all of that to the Radeon RX 7900 XT, which makes use of a 5 nm design. AMD has set the core speed at 1500 MHz. The GDDR6 RAM runs at a frequency of 2500 MHz on this particular model. It features 5376 SPUs as well as 336 TAUs and 192 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 7900 XT		300 Watts
	Difference: 235 Watts (362%)

Memory Bandwidth

The Radeon RX 7900 XT, in theory, should be a lot faster than the GeForce GT 640 DDR3 overall. (explain)

Radeon RX 7900 XT		819200 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 762176 (1337%)

Texel Rate

The Radeon RX 7900 XT is much (about 1650%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon RX 7900 XT		504000 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 475200 (1650%)

Pixel Rate

The Radeon RX 7900 XT is a lot (about 1900%) better at anti-aliasing than the GeForce GT 640 DDR3, and able to handle higher screen resolutions more effectively. (explain)

Radeon RX 7900 XT		288000 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 273600 (1900%)

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 max amount of information (in units of MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.