minimum voltage of zalman 7000 Cu?

knutinh · Post by **knutinh** » Mon Mar 14, 2005 12:51 am

Is it possible to lower the voltage even more than that possible with the fan controller supplied? Tapping either 5V or inserting an additional resistor? At what voltage does the fan cease to reliable start?

regards
Knut

ckolivas · Post by **ckolivas** » Mon Mar 14, 2005 2:10 am

I found mine worked down to about 3.5v, and then it would stop. Shortly after that I replaced the fan instead. Your mileage may vary of course.

Pjotor · Post by **Pjotor** » Mon Mar 14, 2005 4:28 am

ckolivas wrote:I found mine worked down to about 3.5v

I second that. It can handle really low voltages.

mco_chris · Post by **mco_chris** » Mon Mar 14, 2005 6:29 am

You're talking 100% straight-line DC and not PWM DC, right? My Zalman fan won't go that low on PWM. I'm disappointed with Zalman fan speed via PWM - it stops around 50% duty cycle.

Pjotor · Post by **Pjotor** » Mon Mar 14, 2005 6:38 am

At least I used straight DC current. I don't know about ckolivas though.

ultraboy · Post by **ultraboy** » Mon Mar 14, 2005 7:20 am

mco_chris wrote:You're talking 100% straight-line DC and not PWM DC, right? My Zalman fan won't go that low on PWM. I'm disappointed with Zalman fan speed via PWM - it stops around 50% duty cycle.

Well, I got curious after reading your post. So I turn my T-ban control on CNPS 7000A w. stock fan down to 4% duty cycle and it's still spinning at 113 rpm based on T-ban report.

CPU temp increase from 33°C to 50°C (side panel open w. room temp at 26°C), and still climbing up after 10 minutes.

I did stop the fan using finger on fan hub and fan spinned again when I released it. If I go below 4% duty cycle, fan will stop though.

mco_chris · Post by **mco_chris** » Mon Mar 14, 2005 7:29 am

ultraboy wrote:I turn my T-ban control on CNPS 7000A w. stock fan down to 4% duty cycle and it's still spinning at 113 rpm

Wow! I have 3 PC's and none can control a Zalman like that! I just ordered a T-Balancer.

ultraboy · Post by **ultraboy** » Mon Mar 14, 2005 7:35 am

mco_chris wrote:Wow! I have 3 PC's and none can control a Zalman like that! I just ordered a T-Balancer.

Good decision. Get the T-ban XL with analog sensor.

mco_chris · Post by **mco_chris** » Mon Mar 14, 2005 8:26 am

ultraboy wrote:Get the T-ban XL with analog sensor.

Do the analog sensors do something mo' better than the digital sensors?

ultraboy · Post by **ultraboy** » Mon Mar 14, 2005 8:49 am

I think so.

1. Analog sensor seems to read temp comparatively more accurate than its digital cousin. There's some discussion on this in one of the T-ban thread here.

2. It's easier to place analog sensor in tight space e.g. I have one on back side of vga card underneath ZM80D.

3. Analog hub gives additional function to T-ban e.g. emergency shut off.

Now that mCubed allows you to configure what you like, total cost is not too bad. When I ordered my T-ban + analog hub + 4 analog sensor, and forego all digital sensors, I paid just a few USD more than a standard unit with digital sensors.