Go all water cooled with a decent custom loop. My fans are quiet even under full load seldom making it past 800 rpms Pump speed is normal. If its making noise you have an air pocket thats where it doesnt need to be that almost always is a result to how it was installed.
The FAN brand can make all the difference IMO, I tried some in my quest for a dead silent PC.
An airflow friendly case can account for the most, regarding temps, but they will let the fan noise come out as well.
2x 140 Intake NF-A14 Noctua Chromax 1x 120 Exhaust NF-A12x15 Noctua Chromax 2x 120 Ryujin NF-F12 Noctua iPPC (@800rpm) 1x VRM Fan Ryujin (@400rpm as this fan can get loud easily) 3x GPU @900-1300rpm depending of the game 1x PSU Strix 750 but mostly off unless I start rendering hard
Corsair LL or ML need to be at very low speeds or they will be noisy, ML can really push some serious air and the AF too but Noctuas can go higher on rpm to compensate, but no RGB...
Cooler Master was great for the first year, then started rattling. Phanteks.. sorry but no. Be quiet is amazing too but they don't push a lot of air. NZXT, Zalman and Thermaltake on the average.
I don't know about 2500 rpm's for a graphics card. For me, it seems very high however you might want to check the manufacturers specifications. Maybe it's normal? Honestly, I never checked my rotations per minute on my graphics card 😛 The Titan RTX doesn't get loud that's for sure.