A little follow-up information... Apparently Core Temp 1.0 RC4 specifies a Tj. Max value of 100°C for this processor. Based on Core Temp's FAQ, this is different from the Intel published Tcase value of 63°C. So, based on Core Temp's guidance, my situation may be normal as CPU 1 temps peak at 80°C and CPU 2 temps peak at 92°C.
I think I'd still like to find a means to regulate the fan speed to keep the memory cool and drop the CPU temps down a bit. Core Temp recommends keeping the temps 20°C below the Tj. Max value. It looks like one processor is pretty much there, but the other is hotter.
Given the 100°C spec referenced in CoreTemp FAQ, I've been content to let the system hammer away at 80-90°C. It's been running all 8 cores that way consistently since my last post, and I have had no issues. I'm trusting that Dell can manage its own CPU cooling requirements. At this moment, with 72°F ambient, core temps are 71-86°C - safely below 100°C. The fans are slightly louder than when the CPU is at idle, and I like quiet these days.
I have an option for you that may work if your system is like mine. As I mentioned in my original post, the chassis intrusion switch appears to disable the normal fan control and runs them at full speed. You might be able to disable it permanently by unplugging from the motherboard or rigging the switch so it shows intrusion, though you may get an annoying boot notification every time you restart.
When the fan controls were disabled, I found that I could use SpeedFan to regulate the speed of the fans. Note that SpeedFan is very powerful, but also somewhat complex, and it seems inconsistent in what fans it can control. You can also setup component temperature criteria by which SpeedFan will alter fan speeds for you. NOTE: You could easily set things in such a way that could cook your CPU. I recommend you install SpeedFan before you disable the chassis intrusion switch. It will report the fan speeds to you, so you will have a baseline
I just upgraded my 690 to a T7400 with the latest BIOS and I have the same problem - fan won't spin up, GPU and CPUs are cooking. Don't care about 100 degree ceiling, heating them near that will shorten their lives.
Could it be a heat or air sensor fault? I know Apple G5 PowerMacs had very similar problems to what I've read about the T7400, usually fan overrevving.
snoobler
3 Posts
0
November 7th, 2012 12:00
A little follow-up information... Apparently Core Temp 1.0 RC4 specifies a Tj. Max value of 100°C for this processor. Based on Core Temp's FAQ, this is different from the Intel published Tcase value of 63°C. So, based on Core Temp's guidance, my situation may be normal as CPU 1 temps peak at 80°C and CPU 2 temps peak at 92°C.
I think I'd still like to find a means to regulate the fan speed to keep the memory cool and drop the CPU temps down a bit. Core Temp recommends keeping the temps 20°C below the Tj. Max value. It looks like one processor is pretty much there, but the other is hotter.
Any additional input is appreciated.
Thanks,
Steve
PeJaGo
1 Message
0
March 20th, 2013 20:00
I am having similar problem / results. I am using two X5450 chips: Quad core 3.0 GHz.
CPU 0 is maxing at about 82 C and CPU 1 is maxing at about 91 C.
Are there any utilities that we can use to bump up the fan speed?
I am also supporting BOINC projects and my CPUs are usually max'ed out.
Many thanks.
Perry
snoobler
3 Posts
1
March 21st, 2013 08:00
Perry,
Given the 100°C spec referenced in CoreTemp FAQ, I've been content to let the system hammer away at 80-90°C. It's been running all 8 cores that way consistently since my last post, and I have had no issues. I'm trusting that Dell can manage its own CPU cooling requirements. At this moment, with 72°F ambient, core temps are 71-86°C - safely below 100°C. The fans are slightly louder than when the CPU is at idle, and I like quiet these days.
I have an option for you that may work if your system is like mine. As I mentioned in my original post, the chassis intrusion switch appears to disable the normal fan control and runs them at full speed. You might be able to disable it permanently by unplugging from the motherboard or rigging the switch so it shows intrusion, though you may get an annoying boot notification every time you restart.
When the fan controls were disabled, I found that I could use SpeedFan to regulate the speed of the fans. Note that SpeedFan is very powerful, but also somewhat complex, and it seems inconsistent in what fans it can control. You can also setup component temperature criteria by which SpeedFan will alter fan speeds for you. NOTE: You could easily set things in such a way that could cook your CPU. I recommend you install SpeedFan before you disable the chassis intrusion switch. It will report the fan speeds to you, so you will have a baseline
Good luck!
Steve
Aurael
2 Posts
0
August 21st, 2015 17:00
HI,
I just upgraded my 690 to a T7400 with the latest BIOS and I have the same problem - fan won't spin up, GPU and CPUs are cooking. Don't care about 100 degree ceiling, heating them near that will shorten their lives.
Could it be a heat or air sensor fault? I know Apple G5 PowerMacs had very similar problems to what I've read about the T7400, usually fan overrevving.
I love this machine - Help!