For that CPU and GPU you can use a minimum of five segments of 120mm radiator capacity. A 360 radiator in the top and a 240 in the side would do, although that case also supports a 280 in the side according to the manufacturer's website. I'd go with a 360/280 if it were mine because a 280 is a lot more cooling capacity than a 240.
Graphics card water blocks must fit exactly. Please verify with the water block manufacturer that it will fit because I'm not sure how accurate your source is for "i've been told" and buying the wrong thing will result in unhappiness.
You should look in person at the reservoir / pump units available to see what you like the look of. I have soft tubing myself so I can't really advise you on what kind of hard tubes but I heard that acrylic and petg both have ups and down and that glass is best but most difficult to bend. I think if I had to do hard, I'd use glass straight and fittings for every curve :/
What's your intended budget for the build?
What parts are you looking to upgrade exactly? What would you be wanting to water cool?
One or two radiators, rule of thumb is 120 mm per 100 watts
I don't see that Micro Center has any waterblocks in stock for an EVGA 3080ti FTW
I’ve been told the bitspower 3090 ftw3 block would work
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