7v mod is the best!

[jbslow]

I'm glad I finally did this I have two 80mm delta 58cfm screamers and the temps were not worth the noise in my book so I cut them to 7v and my temps only rose 2c and the noise dropped alot now I just need to get rif of my delta black lable hsf (38cfm).

I just cut the ground from the fan about 2 in. from the were it met the molex connection then spliced it into the 5v line about half way down and connected the fan ground in the 5v line and walla I didnt even need to remove the molex pins but I did remove the 5v line molex pin just so it would be safe.

Edit I ment 68cfm screamer :eek: !

[adamtekh]

i know what u mean man :beer:

[aznboi64]

Any way you can show me with a diagram? I have a 38cfm delta screamer with my Vantec. I was thinking of a rheostat but since I can always reverse this 7v mod I rather try it first. ANd with this mod is there anyway to monitor the temp on the cpu?

[el]

get a pot. how many amps do the 68cfms draw?

[TruckChase!]

Rheostats work better than POTs for controlling fan voltage.

& FYI, just to clear up any misconceptions, the article said this:

"When you have +12V -5V you get +7V"

It should read +12v & +5v=+7v since the overall voltage is the differance between power and ground. If you hooked +12 to -5 you would get -17, and I'd guess you may damage the power supply as well. Other than that, great article!

[aznboi64]

So from my delta I hook up the red to the yellow wire and the black to the black to get 7v correct? And is there anyway to monitor my temps with this mod?

[TruckChase!]

Black to the black doesn't matter. The reason you get 7v is because you're using +5v as the ground, so you just hook the +12v to the positive and the +5v to the negative. As far as monitoring temps, just use MBM 5 with your built in sensors. It's not the best way, but it's the easiest.

Just a quick reccomendation to those of you doing the 7v mod... I'd reccomend a rheostat or even a three-prong switch between 7 and 12v instead of hard wiring 7v. That way you can crank the voltage up when you need it, and it's not much more work.

[SteenkyBastage]

Originally posted by aznboi64
So from my delta I hook up the red to the yellow wire and the black to the black to get 7v correct? And is there anyway to monitor my temps with this mod?

not quite.

fan side/molex side

12v/12v(yellow)

ground/5v(red)

so the only difference is instead of your fan's ground wire connecting to the molex ground (black), you would connect the fans ground wire to the molex 5v wire.

also, i agree with the idea of using rheostats, much easier to hit your sweet spot between noise/performance. plus you can always up the rpms if you ever need it.

[adamtekh]

umm i u CANT moniter RPMS

[jbslow]

Originally posted by aznboi64
Any way you can show me with a diagram? I have a 38cfm delta screamer with my Vantec. I was thinking of a rheostat but since I can always reverse this 7v mod I rather try it first. ANd with this mod is there anyway to monitor the temp on the cpu?

Here you go the top one is the mod and the bottom is standard.

If you cant tell (I know this pic is lame) I cut the ground (from fan to molex) about 2 inches from the molex pin. Then I cut into the 5v line (red) and simply added a small piece of wire from the 5v line to the cut ground coming off the fan , taped it up and wala instant gratification.

[jbslow]

Originally posted by el
get a pot. how many amps do the 68cfms draw?

I think its .58 amps but to make sure I would need to take one out and remove the aluminum filter (which rock by the way).

[aznboi64]

JBslow - Its doesn't look lame to me. Thankx for the help. So basically you just did the mod with 1 wire and thats it?

[jbslow]

Originally posted by aznboi64
JBslow - Its doesn't look lame to me. Thankx for the help. So basically you just did the mod with 1 wire and thats it?

Thats right I cut the one wire and spliced it into another wire. I did cut a small peice wire (about 2in) to run from the fans ground to the 5v line so I didnt need to strech to make the connection.

I cut the ground from the fan a good two inches from the where it met the molex so if needed I could easily run the fan @ 12v again.