Cheap (possibly fake graphics card) (£12 GTX 1050Ti 4GB)
You can find out by removing the heatsink and reading the numbers on the chips.
The memory for example has a code written on it, that will point you to the datasheet of the ram and you can then find out stuff.
For example see https://simple.wikipedia.org/wiki/Video_card#/media/File:NVIDIA_GeForce_GTX_780_PCB-Front.jpg
Those square chips are memory chips:
So if you google K4G20325FD you can find out the info for the chip : https://datasheet.ciiva.com/26785/k4g20325fd-fc04-26785648.pdf
According to page 2 in datasheet, it's a 2 gbit chip (1 GB = 8 gbit , so each chip has 256 MB of memory), 1.5v , 6000 mbit speed ... there's 12 chips on that video card, so it's a 12 x 256 MB = 3 GB GDDR5 card.
The fake cards SOMETIMES also erase the old text and put new text but most of the time they don't bother. They just modify the bios on the video card to trick the video card drivers into thinking the video card has more video memory and that it's a newer chip.
Because video cards can also use a portion of your computer's ram for memory if the video card memory is not enough, often games won't crash if they try to use more memory than what the video card actually has (for example let's say you try to play a game like GTA 5 on 1080p ultra quality, which means game tries to use more than 3-4 GB of memory while your video card may have only 1-2 GB in reality) but as soon as the game constantly has to move data from computer ram into video card ram and back, the framerate goes way down and your games would be slow.
Sometimes though even this doesn't work and games would crash.
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