![]() ![]() I have some Antecs that won't start on lower than 7V, but if you hook them up to 3-4VDC supply and start them with your finger they'll run just fine). ![]() With conventional fans that just hook up via 2-wire you can still feed them off a pot which will vary voltage from 0-12, usually starting voltage for most fans (especially big ones) is relatively high (>5V) but they may be okay actually running at lower than starting voltage (e.g. ![]() The 4-wire setups on newer graphics cards you can pick whatever RPM % you want and it will get fairly close to the specified target. For example the 3-wire on my A8N has at least 5 "tiers" it can select for the CPU fan. Modern PWM is very granular, and older voltage controlled setups (3-wire with tach return) will usually have somewhat more granular control than 5-7-12. I'm thinking fan speeds change with resistance (you can only use 5v, 7v or 12v afaict). I don't see how much larger CPU fans can use less than 12v. Wired 55mm cooler to 5v recently and sometimes took a while before starting to move. ![]()
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