So this was the expirence i got after contacting MSI directly LOL
ME - "So i recently recieved my MSI GeForce RTX 3080 Ventus 3X OC and i'm getting crashing problems with it. So basically when im in game within the first few seconds of playing it crashes and i believe the problem is the factory overclock is too high, as the core clock speed boosts all the way up to 2010Mhz in game and as soon as it reaches that speed it crashes. It does this in all games. The only way i can fix this problem is by downclocking the core clock in msi after burner. Another thing that is strange is that MSI stated that the normal clock speed is 1440Mhz but it never goes that low even in idle, and the boost clock is 1740Mhz and that is the speed it sits at in idle. But as soon as you go in game its starts overclocking itself upwards towards 2010Mhz and crashes itself. I use no auto overclocking software of any kind, and haven't tried to overclock it once. the only thing i have done is downclock it to make it actully work in game. i am also using all the lastest Nvidia Drivers."
MSI - "suggest change a big power PSU, recommended PSU 750W. THANKS!"
ME - "Hi thanks for the reply, I currently have a brand new 750w PSU (Corsair tx750m)"
MSI - "thanks for your troubleshooting, In this case, you need to contact your retailer, ask for repair or replacement option. thanks!"
Now i don't know whether or not i should ask for a RMA from Overclockers UK or wait for new drivers or something, as i don't want to wait too long and then not be able to return it if it is actully faulty