Want higher speeds? -CHECK THIS OUT!

[spdsk8r]

The biggest problem with overclocking is HEAT... so you can either buy a better heatsink and fan for an unreasonable price, or push your fan to the max:<br>
<br>
I am not responsible for any damage<br>
<br>
The average fan runs at 12V, In most cases the black wire is the ground (0V) and the Yellow is +12V - your fan's red wire actually connects to the yellow... (check your power supply to be sure)<br>
<br>
1. you need to cut the ground wire on the fan (usually black)<br>
2. strip the -5V wire coming out of you power supply (usually white) DO NOT CUT IT!<br>
3. connect the ground wire to the -5V and cover it with electric tape to prevent shorts<br>
<br>
Now your fan should be running at 17V instead of 12V... Don't try to get 24V - It won't last long at all! So if it was running at 4200RPM before it will now run at about 6000RPM without spending extra money on a better fan! Remember running your fan at a higher speed than recommended will wear down your fan faster so watch that it doesn't burn out - this could make more problems damaging your CPU<br>
<br>
Power Supply<br>
| ||<br>
white -> | ||<br>
| || <- yellow<br>
| |<- black<br>
| ||<br>
------| ||<br>
black | |<br>
FAN============--------<br>
^<br>
red

[spdsk8r]

oops I thought you needed HTML... Sorry

[spdsk8r]

The biggest problem with overclocking is HEAT... so you can either buy a better heatsink and fan for an unreasonable price, or push your fan to the max:

I am not responsible for any damage

The average fan runs at 12V, In most cases the black wire is the ground (0V) and the Yellow is +12V - your fan's red wire actually connects to the yellow... (check your power supply to be sure)

1. you need to cut the ground wire on the fan (usually black)
2. strip the -5V wire coming out of you power supply (usually white) DO NOT CUT IT!
3. connect the ground wire to the -5V and cover it with electric tape to prevent shorts

Now your fan should be running at 17V instead of 12V... Don't try to get 24V - It won't last long at all! So if it was running at 4200RPM before it will now run at about 6000RPM without spending extra money on a better fan! Remember running your fan at a higher speed than recommended will wear down your fan faster so watch that it doesn't burn out - this could make more problems damaging your CPU

Hope this helps!

[Stryker]

Hmmm?

I could turbo charge my 3 fan heatsink, or maybe my RadioShack snail shaped blowers, talk about air circulation. I feel some experiments coming on.

Thanks for the tip spdsk8r!

[This message has been edited by Stryker (edited 02-17-99).]

[Roy]

Good Idea. http://www.sysopt.com/forum/smile.gif

Keep watch on your drive performance. The inductive characteristics of the fan(s) could introduce some unwanted artifacts into the -5V supply to the drives' electronics.

[Stryker]

Hey!
This really works, I just tried it using the my old heatsink fan for a test. It really kicks the fan into gear, I will rewire my new heatsink fan tommorow and check temp variations. http://www.sysopt.com/forum/smile.gif

I found something else of interest during this test. I noticed every time the hard drive was acessed the fan would slow down in either turbo wired or normal mode.

This tells me that its not just high processor use thats causes the high temps. Its actually a combo of high processor use and the slowing of the fans while accessing the harddrive during this high use.

I have a 300v powersupply which apparently is not powerful enough to keep everything supplied at the same time.

So, what I am going to do is get a couple if 12v ac adapters and run all fans other than the heatsink fan off of them.

The only reason I will not run the heatsink fan off the adapter is because I am going to turbo wire it.

This should keep things even cooler, will see.

[Stryker]

Roy,
Do you mean the fan could generate negitive ions that could effect the harddrive?

[spdsk8r]

The hard drive uses the -5V source, so that's why you're seeing the fan slow down... This could also work in reverse too - the hard drive could not get sufficient power, but it's not enough of a difference to cause a problem

[Roy]

As far as I know, the drive motors run off the 12V and the electronics use the -5V. A 300W PS should not exhibit voltage sag, but the extra fans might be drawing more than we think.

Negative ions? No. My concern is that the Fan Turbo trick might affect the purity of the DC to the random piece of electronics that doesn't provide adequate on-board filtering and decoupling - most are OK.

[spdsk8r]

I've gotten several replies by email now from people who have read my post so I should probably tell everyone how this is working for everone -

Average speed increase (RPM):
41%

Average temp decrease:
14.5%

Problems:
None reported so far

Overclocking abilities:
4 of 10 people have been able to succesfully OC at higher speeds than before speeding up the fan, and all have seen a temp. decrease!
Results are compiled from 10 responses by email who have tested their CPU

I'll give you an update as soon as I get more responses -

please send results to my TEMPORARY email address: fanspeed@hotmail.com

send all other questions or comments to: spdsk8r@execpc.com

***WARNING***
A possibly serious issue has been brought to my attention - The -5V part of your power supply is only able to handle 0.5A for the entire system. MOST componants or none at all use the -5V section, but if you do have too many, running your fan at 17V could possibly blow that section of your power supply which might not allow certain parts to operate correctly. So once again:

TRY THIS AT YOUR OWN RISK - I DON'T WANT TO BE HELD RESPONSIBLE FOR ANY DAMAGE!

[This message has been edited by spdsk8r (edited 02-17-99).]

[Roy]

WARNING - IT SEEMED LIKE A GREAT IDEA. BUT...

A supply I looked at has a label for 3 models - 230, 250 & 300W. The +12 ratings are 9, 10 and 12A respectively - plenty of power. (108W, 120W, 144W)

The -5V rating is 0.5A (2.5W) for all, and the -12V rating is 0.8 (4W).

The Turbo Fan trick risks killing the -5V section of the PS http://www.sysopt.com/forum/frown.gif

[This message has been edited by Roy (edited 02-18-99).]

[spdsk8r]

OK, I've done some research... Almost all fans run at .11A (about 1/5 of the PS max) so it might be safe and might not be...

USE CAUTION - if the PS gets really hot or your system stops working properly disconnect the fan immediatly

[Stryker]

DOH! Before I read Roy's last post I was wondering if this same trick would work on peltiers?

That would really cool things off more but better not try.

To bad you can't run a power supply with out a mother board hooked up to it. I would have liked to used my old 200v power supply to power all my fans turboed and otherwise.

Stryker

[This message has been edited by Stryker (edited 02-17-99).]

[This message has been edited by Stryker (edited 02-17-99).]

[Roy]

I concur with spdsk8r. One little fan probably is OK. "Duals" maybe not.

[JP]

You know you people could just place a 2 foot box fan blowing directly into your computer with the case off. It seems as though none of you have any problem over-doing things. :-)
-JP
http://members.xoom.com/PSComputers