you are confusing graphics memory ( written as DDR5 or GDDR5 ) with system memory ( DDR3). There is nothing higher than DDR3 for the computer. Video cards use DDR5. There is no DDR6 yet for anything.
Thank you and yes that does not surprise me that i could mix that up as sadly i do not know a huge amount about computers, so with RAM it doesnt actually matter what ram i have because it wont effect the card as such, is this what you are saying. Plus with that knowledge would i be able to get any DDR5 graphics card but im still stuck on which graphics card to get because at the moment i have a NVidia 295 GTX but it heats up quite a lot nowadays and was thinking of upgrading (ive already looked for GPU coolers but sadly they dont sell them for 295 anymore only installed ones)?