Is this safe?

Ollie` · Post by **Ollie`** » Sat Nov 19, 2005 10:42 pm

My first atempt at the 7v mod. Looks right to me! is it? lol...
I'm wondering if its safe to run 2 120mm fans off this? and in this way?
I would be using the two 3pin conections for the fans.

mathias · Post by **mathias** » Sat Nov 19, 2005 10:53 pm

Two 12cm fans? Are they identical? If so, you can also run them at 6 volts by connecting them in series (by connecting the red wire of one fan to the black wire of the other).

Ollie` · Post by **Ollie`** » Sat Nov 19, 2005 11:06 pm

Yea they are both the same make and type. Both are also 12cm. Before i try your 6v thing Id like to try the one above or the one i just made. I just need to know if its safe.
I made another one

Is this better?

Ollie` · Post by **Ollie`** » Sat Nov 19, 2005 11:37 pm

Tryed the second one and it didnt start a fire or anything .. seems safe! lol ... still wouldnt mind an expert opinion

NoizEnvader · Post by **NoizEnvader** » Sat Nov 19, 2005 11:44 pm

Yeah, that looks to be correct. I found however, that not all PSU's work well with the 7v trick. The 6v trick is far superior and quieter.

Ollie` · Post by **Ollie`** » Sat Nov 19, 2005 11:52 pm

I will run this for a while .. Seems to work. Computer is pretty quiet now (was before to)

Ollie

NoizEnvader · Post by **NoizEnvader** » Sun Nov 20, 2005 12:07 am

Must say, it's very neatly done tho. Like the silver cabling.

Oh' and....

WELCOME TO SPCR!!!

chylld · Post by **chylld** » Sun Nov 20, 2005 12:29 am

welcome to spcr ollie!

i agree - very nice cabling. i've never actually worked with those connectors, only the wires - so my mods have never been as neat.

i'm with mathias in suggesting the 6v fans-in-series trick - i recommend you don't run the 12-5=7v trick for a prolonged period. i destroyed my antec sl350s power supply doing that =\

if you need 7v though, you can do it very cheaply and safely using a 5v1 zener diode in-line (assuming the fan is a relatively low-airflow one).

Ollie` · Post by **Ollie`** » Sun Nov 20, 2005 12:42 am

Hehe thanks guys. long time reader 1st time poster.

Ollie` · Post by **Ollie`** » Sun Nov 20, 2005 1:37 am

Would a Zalman fan mate 2 be safer then this volt mod?

NoizEnvader · Post by **NoizEnvader** » Sun Nov 20, 2005 2:44 am

Ollie` wrote:Would a Zalman fan mate 2 be safer then this volt mod?

Yes, but why spend money on something you can do yourself.

Try the 6v trick first, using the same cabling you already have.

Also have a look at the link below.

http://www.cpemma.co.uk/index.html

Ollie` · Post by **Ollie`** » Sun Nov 20, 2005 1:34 pm

Thanks for the link

Badger · Post by **Badger** » Sun Nov 20, 2005 1:56 pm

chylld wrote:
i'm with mathias in suggesting the 6v fans-in-series trick - i recommend you don't run the 12-5=7v trick for a prolonged period. i destroyed my antec sl350s power supply doing that =\

Haha I'm pretty sure that's how I ruined my Antec sl350s, too. It exploded - wasn't pretty.

BrianE · Post by **BrianE** » Sun Nov 20, 2005 1:57 pm

Hi and welcome!

Hmmm.... those wires look just like the ones that come with the Coolermaster SUF fans?

chylld · Post by **chylld** » Sun Nov 20, 2005 4:19 pm

Badger wrote:
chylld wrote:
i'm with mathias in suggesting the 6v fans-in-series trick - i recommend you don't run the 12-5=7v trick for a prolonged period. i destroyed my antec sl350s power supply doing that =\
Haha I'm pretty sure that's how I ruined my Antec sl350s, too. It exploded - wasn't pretty.

exploded!? damn! didn't know a psu could actually explode. mine just gave up the ghost after bouts of instability, then when it didn't work anymore i opened it up and found lots of leaking caps.

oh well - i replaced mine with a silverstone fanless psu, no way i'm going to try the 7v trick on this one

Ollie` · Post by **Ollie`** » Thu Nov 24, 2005 4:55 am

I just 5v modded both my 120mm fans.... man thats nice! It says here.. http://forums.silentpcreview.com/viewtopic.php?t=22943
that this mod is safe. I NEED to know if it really is!?!? Hehe. I just got a brand new Fortron SAGA 450 and i REALLY dont want it to blow up ROFL. I ran the 7v mod for like 5 mins so im not worried that it damaged anything. 5v i have now run for like 10 mins rebooting a few times to see if the fans started everytime.

Thanks

EDIT: Only problem now is my CPU fan seems %100 louder .. DAM you SPCR now i have to spend money on a new HSF!!

NoizEnvader · Post by **NoizEnvader** » Thu Nov 24, 2005 5:10 am

Perfectly safe yes.

Ollie` · Post by **Ollie`** » Thu Nov 24, 2005 4:01 pm

Great

The only problem i see with 5v is that a fan may not start one day. Isnt a powered fan thats not moving a short?

Ollie` · Post by **Ollie`** » Thu Nov 24, 2005 5:14 pm

Took some pics. Could somone PLEASE double check to make sure i did it right?

Thanks

chylld · Post by **chylld** » Thu Nov 24, 2005 5:24 pm

that looks fine.

my only concern is in the 2nd pic, the unused connector at the top right is obviously only half-connected (and with the wrong voltage) so i suggest you tape over it and write "not to be used" or something to prevent confusion later on.

Ollie` · Post by **Ollie`** » Thu Nov 24, 2005 6:17 pm

Thanks. I would prolly remember but i think i will put a reminder on those conections.

Heres what i have done so far if anyone cares

Sempron 64BIT 2800+ @ 2.6GHz
GIGABYTE K8NS
1gb OCZ Platinum EL PC3200 @ 252MHz ( 2.5-3-3-8 )
GIGABYTE Radeon 9550 128MB
2x MAXTOR DiamondMax 10 200GB (wasnt planing on building a quiet sys when i got them but they arnt bad)
Fortron FSP/SPI SAGA AX450-PN 450W
Antec SLK3700AMB (Case)

chylld · Post by **chylld** » Thu Nov 24, 2005 6:30 pm

yeah that cpu fan sure looks like it could use with a replacement

if i was aircooling i'd just go for spcr's top pick which i think is a scythe ninja with a nexus fan.

Ollie` · Post by **Ollie`** » Thu Nov 24, 2005 6:40 pm

WOW! that scythe ninja is insane! lol .. i think ill go for somthing less drastic. Cheapest thing i can think of it just replacing the fan on the stock heatsink. Probably hard to find a quiet 70mm fan tho. Or one that starts at 5v. This Sempron is VERY cool. Even at a %60 overclock its never gone over 35C (according to Everest and BIOS) and idle is 22C (its in a cold room)

SebRad · Post by **SebRad** » Sat Nov 26, 2005 11:33 am

Hi, I've only ever worked with one A64 system and that was a Sempron 2800+ (1.6GHz, 256Kb L2 cache) with a retail box cooler on it. I found it ran fine overclocked to 1.8GHz with the stock cooler hardwired to 5v. (the cooler and mobo both had no thermal fan control) It only got to about 40-45°C running CPU burn, although the case had a side panel duct and 90mm rear fan so there was reasonable case cooling helping it out. Either way Semprons are cool, although for massive OC (1.6 -> 2.6GHz!) I would recommend something better the box cooler, an Arctic Cooling Freezer would be my recommendation. (SPCR Review) Quiet (undervolted), cheap and should fit on your board.
Sebastien

Ollie` · Post by **Ollie`** » Mon Nov 28, 2005 3:11 am

My Sempron 64 2800+ (1.6GHz, 256Kb L2 cache) is running at 2.5 now .. my max stable is 2.6. Its never broken 35C!!!. Prime95 for 10 hours. I could prolly turn all the fans in my case (including HSF) off and just leave the PSU fan on and it would be fine. I did however buy an ARCTIC COOLING SILENCER 64 ULTRA TC [Stock cooling itself is overkill but TOO LOUD!]. I'm Hopping for the most part it will be spinning at its lowest speed. I was gonna get an XP-90 but i couldnt justify the price for a CPU that runs so cool. However i doubt the heating vent in my room will be busted forever! lol .. hence the TC cooler