GeForce GT 640 DDR3 vs GeForce RTX 3080 12 GB

Intro

Compare all of that to the GeForce RTX 3080 12 GB, which has a GPU core clock speed of 1260 MHz, and 12288 MB of GDDR6X RAM set to run at 1188 MHz through a 384-bit bus. It also is comprised of 8960 Stream Processors, 280 Texture Address Units, and 112 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce RTX 3080 12 GB		350 Watts
	Difference: 285 Watts (438%)

Memory Bandwidth

Theoretically speaking, the GeForce RTX 3080 12 GB will be 1538% faster than the GeForce GT 640 DDR3 in general, because of its greater data rate. (explain)

GeForce RTX 3080 12 GB		934298 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 877274 (1538%)

Texel Rate

The GeForce RTX 3080 12 GB is quite a bit (more or less 1125%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce RTX 3080 12 GB		352800 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 324000 (1125%)

Pixel Rate

The GeForce RTX 3080 12 GB will be quite a bit (approximately 880%) faster with regards to FSAA than the GeForce GT 640 DDR3, and also should be capable of handling higher resolutions better. (explain)

GeForce RTX 3080 12 GB		141120 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 126720 (880%)

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 transferred across the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 can be processed in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the video card will be at handling 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 video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.