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From experience so far, dropping the RPM a small amount at the top end brings a far larger reduction in noise level. It would appear to be a log function rather than linear. AidanII
__________________ Any views, thoughts and opinions are entirely my own. They don't necessarily represent those of my employer (BlackBerry). |
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And how much amperage is available with the standard 12v-to-7v mod? That's easy, for the conservatively minded(as far as PC mods go) none. Might as well be none. Personally, I won't do this mod.
__________________ When the world will be better. |
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The amperage is identicle to that which is available on the 12V rail so long as sufficient power is being consumed by devices attached to the 5V rail. This is not really an issue of amperage, it is an issue of electromotive force. |
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The bridge between 12v and 5v to provide 7v volts works because... The PSU will deliver only 5v to the 5v line. Connecting your fan between the 12V and 5V causes the following to happen. The current drawn by the fan is passed onto the load (as it's at 5V, it's a usable 5V). The PSU then delivers a fan sized less current to the 5V line, as it's coming from the 12V line. Technically, if you had plenty of power on the 12V line, you could use this sort of technique to bolster up a sagging 5V line. I'd not recommend it for too much load though, as the fan doesn't pass enough current. The only problem you have to watch out for is that the load across the 12v and 5V lines isn't larger than the load across the 5V line. Given the current consumption on the 5V line, that's unlikely, unless you unplug motherboards from the PSU. AidanII
__________________ Any views, thoughts and opinions are entirely my own. They don't necessarily represent those of my employer (BlackBerry). |
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Rig the PSU fan to the five volt out on one of hard drive connectors. This makes the PSU close to silent :-D But it will run warm though. John
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You can make a 12V to 7V or 5V molex . It took me all of 5 minutes the first time and they work great. Easy way to test the results without making a permanent change.
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I've noticed on a few fans, 7v may not be enough to overcome inertia and spin up initially. I personally love this mod.. I've got about 7-8 fans atm running on 7v, including a 6cm delta 7000rpm screamer. Since 2 of my pcs on in kid's bedrooms, and the weather is getting cooler, I've managed to silence 1 machine, and seriously quiet 2 more. Whenever voltmodding is done, extra care must be taken. When done properly, the results can be joyous silence. ![]()
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