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#1
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P4P800-E Deluxe -- Q-Fan & CHA_FAN
Using a P4P800-E Deluxe in an Antec SLK3700-BQE case with Antec SL350 PSU.
CPU fan is Zalman 7000A-AlCu. Case fans: Rear -- Antec without sensor lead Front -- Antec SmartCool with sensor lead The PSU and CPU fans have sensor leads which are connected to the mobo. ASUS Probe and MBM5 see and monitor these temps and fan speeds. The front fan (SmartCool) has a lead, but when I connect it to the CHA_FAN connector, I get erratic readings in ASUS Probe and MBM5 doesn't see this fan. Having this fan connected to CHA_FAN "screws up" the speed readings of the other two fans in Probe. (I have the latest version of Probe.) QUESTIONS: -- Why am I having trouble when the SmartCool fan is connected to the CHA_FAN connector? Should that work correctly? Why won't MBM5 recognize that fan? -- Antec's Web site says the PSU has SmartPower to sense temps and adjust the fan speed. The SmartCool case fan also has a built-in sensor and adjusts speed automatically. If this is the case, should I have Q-Fan disabled? Will the built-in fan technology conflict with Q-Fan, or make it unnecessary? Thank you. John |
#2
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"John Blaustein" wrote in message
... Using a P4P800-E Deluxe in an Antec SLK3700-BQE case with Antec SL350 PSU. CPU fan is Zalman 7000A-AlCu. Case fans: Rear -- Antec without sensor lead Front -- Antec SmartCool with sensor lead The PSU and CPU fans have sensor leads which are connected to the mobo. ASUS Probe and MBM5 see and monitor these temps and fan speeds. The front fan (SmartCool) has a lead, but when I connect it to the CHA_FAN connector, I get erratic readings in ASUS Probe and MBM5 doesn't see this fan. Having this fan connected to CHA_FAN "screws up" the speed readings of the other two fans in Probe. (I have the latest version of Probe.) QUESTIONS: -- Why am I having trouble when the SmartCool fan is connected to the CHA_FAN connector? Should that work correctly? Why won't MBM5 recognize that fan? -- Antec's Web site says the PSU has SmartPower to sense temps and adjust the fan speed. The SmartCool case fan also has a built-in sensor and adjusts speed automatically. If this is the case, should I have Q-Fan disabled? Will the built-in fan technology conflict with Q-Fan, or make it unnecessary? Thank you. John Q-Fan only controls the CPU fan RPM. You do not have to disable Q-Fan. If a Fan RPM is too low, MBM5 or probe may show a meaningless (very high) RPM. But, I have never seen this resulting in all the other RPM being sensed wrong too! To make sure nothing is wrong with the chassis fan header, connect your case fan (that has problems with MBM5) to the PSU fan header instead of the CHA header and see if that one shows a correct RPM. |
#3
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Navid,
Thank you. I didn't know that about Q-Fan. Probe is showing very high (negative, as I recall) numbers, so maybe it's because the speed is low. I'll have to re-test all of this... perhaps I was wrong that the other numbers were incorrectly reported in Probe when the CHA_FAN was connected. I will try your suggestion of trying the fan lead on the PSU fan header. I'll report back. Could the fan's auto-sensing technology conflict with the mobo readings? John "Navid" wrote in message r.com... SNIP Q-Fan only controls the CPU fan RPM. You do not have to disable Q-Fan. If a Fan RPM is too low, MBM5 or probe may show a meaningless (very high) RPM. But, I have never seen this resulting in all the other RPM being sensed wrong too! To make sure nothing is wrong with the chassis fan header, connect your case fan (that has problems with MBM5) to the PSU fan header instead of the CHA header and see if that one shows a correct RPM. |
#4
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"John Blaustein" wrote in message ... Navid, Thank you. I didn't know that about Q-Fan. Probe is showing very high (negative, as I recall) numbers, so maybe it's because the speed is low. I'll have to re-test all of this... perhaps I was wrong that the other numbers were incorrectly reported in Probe when the CHA_FAN was connected. I will try your suggestion of trying the fan lead on the PSU fan header. I'll report back. Could the fan's auto-sensing technology conflict with the mobo readings? John The RPM measurement is done by the third wire on the fan. If the fan has RPM control based on temperature or not, the RPM reading itself should not be affected, one way or the other. The fan RPM is adjusted based on its temperature measurement (higher T higher RPM; lower T lower RPM). Any negative feedback system can become unstable if not designed properly. Having multiple control systems trying to control the same thing (case temperature in this case) can add to the possibility of difficulty. But, you will notice it. Oscillation (instability of the control system), in this case, will show up as the fan RPM going up and down continuously and you will hear it. If you do not have that problem, you should be OK. |
#5
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Navid,
OK... here's the scoop... I did the test you suggested -- connecting the chassis fan lead to the PWR_FAN header. It worked fine, and reported the same number as when it is connected to the CHA_FAN header. So, the mobo is fine (I'm glad to report). As of right now, the PSU lead is connected to PWR_FAN and the front fan lead is connect to CHA_FAN. Probe is reporting PSU=1259; CHA=1163; CPU=2083. Since it's all working now, I'm not sure why it wasn't working before, but I can imagine the chassis fan dropped to below the 600 threshhold and that triggered the alarm. I may have been wrong in my initial post that the other numbers were reporting incorrectly. I tried to lower the CHA_FAN threshhold in Probe, but 600 is the minimum. When I first boot with both the PWR and CHA leads connected, BIOS reports: CPU betw 2481 & 2096 (I think Q-Fan kicks in) CHA 1196 IN RED LETTERS PWR 1250 IN RED LETTERS Since Q-Fan only controls the CPU fan, it seems there is no real advantage to keeping the chassis fan connected to CHA_FAN, other than it's good to know what it's doing. By the way, is it OK to connect and disconnect the PWR_FAN and CHA_FAN leads while the machine is running? Can that damage anything? For testing, it's a lot easier to move the leads while the machine is running. John "Navid" wrote in message r.com... "John Blaustein" wrote in message ... Navid, Thank you. I didn't know that about Q-Fan. Probe is showing very high (negative, as I recall) numbers, so maybe it's because the speed is low. I'll have to re-test all of this... perhaps I was wrong that the other numbers were incorrectly reported in Probe when the CHA_FAN was connected. I will try your suggestion of trying the fan lead on the PSU fan header. I'll report back. Could the fan's auto-sensing technology conflict with the mobo readings? John The RPM measurement is done by the third wire on the fan. If the fan has RPM control based on temperature or not, the RPM reading itself should not be affected, one way or the other. The fan RPM is adjusted based on its temperature measurement (higher T higher RPM; lower T lower RPM). Any negative feedback system can become unstable if not designed properly. Having multiple control systems trying to control the same thing (case temperature in this case) can add to the possibility of difficulty. But, you will notice it. Oscillation (instability of the control system), in this case, will show up as the fan RPM going up and down continuously and you will hear it. If you do not have that problem, you should be OK. |
#6
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Forgot to ask... how can I get MBM5 to see all three fans -- CPU, PWR and
CHA? John |
#7
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See below for the comments.
"John Blaustein" wrote in message ... Navid, OK... here's the scoop... I did the test you suggested -- connecting the chassis fan lead to the PWR_FAN header. It worked fine, and reported the same number as when it is connected to the CHA_FAN header. So, the mobo is fine (I'm glad to report). As of right now, the PSU lead is connected to PWR_FAN and the front fan lead is connect to CHA_FAN. Probe is reporting PSU=1259; CHA=1163; CPU=2083. Since it's all working now, I'm not sure why it wasn't working before, but I can imagine the chassis fan dropped to below the 600 threshhold and that triggered the alarm. I may have been wrong in my initial post that the other numbers were reporting incorrectly. I tried to lower the CHA_FAN threshhold in Probe, but 600 is the minimum. When I first boot with both the PWR and CHA leads connected, BIOS reports: CPU betw 2481 & 2096 (I think Q-Fan kicks in) CHA 1196 IN RED LETTERS PWR 1250 IN RED LETTERS Since Q-Fan only controls the CPU fan, it seems there is no real advantage to keeping the chassis fan connected to CHA_FAN, other than it's good to know what it's doing. The alternative is connect it directly to the power supply. Then, MBM5 or ASUS probe will not be able to monitor the RPM since the third wire will not be connected to the motherboard. By the way, is it OK to connect and disconnect the PWR_FAN and CHA_FAN leads while the machine is running? Can that damage anything? For testing, it's a lot easier to move the leads while the machine is running. I don't know. Although, I have done that too. John |
#8
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"John Blaustein" wrote in message
... Forgot to ask... how can I get MBM5 to see all three fans -- CPU, PWR and CHA? John Right click on the MBM5 icon in the taskbar and select "settings". Click on "Fans". Click on "Visual". Choose a fan number. Choose a board sensor. Check "Display this fan in the dashboard screen". Click apply. You may have try different sensors to find the one you are looking for. |
#9
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OK.
Thanks so much for all of your help, Navid! I think I'm in good shape now. John "Navid" wrote in message r.com... "John Blaustein" wrote in message ... Forgot to ask... how can I get MBM5 to see all three fans -- CPU, PWR and CHA? John Right click on the MBM5 icon in the taskbar and select "settings". Click on "Fans". Click on "Visual". Choose a fan number. Choose a board sensor. Check "Display this fan in the dashboard screen". Click apply. You may have try different sensors to find the one you are looking for. |
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