GeForce GT 640 DDR3 vs GeForce RTX 3090

Intro

Compare those specs to the GeForce RTX 3090, which has GPU clock speed of 1395 MHz, and 24576 MB of GDDR6X memory running at 1219 MHz through a 384-bit bus. It also is comprised of 10496 SPUs, 328 TAUs, and 112 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce RTX 3090		350 Watts
	Difference: 285 Watts (438%)

Memory Bandwidth

The GeForce RTX 3090 should theoretically be quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce RTX 3090		958668 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 901644 (1581%)

Texel Rate

The GeForce RTX 3090 should be quite a bit (about 1489%) better at AF than the GeForce GT 640 DDR3. (explain)

GeForce RTX 3090		457560 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 428760 (1489%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce RTX 3090 is superior to the GeForce GT 640 DDR3, by far. (explain)

GeForce RTX 3090		156240 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 141840 (985%)

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 largest amount of information (in units of MB per second) that can be moved across 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 memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 per second. This figure is worked out by multiplying the total texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.