Changed cpu, now cpu fan speeds up when in BIOS

[Nx6595]

I Installed a new cpu (from i3-2130 to i7-2600), now the cpu fan speeds up drastically when I go into the BIOS settings. The pc is a Dell Optiplex 790 SFF.

This hasn't happened before, so I would like to know what can I do to fix this? Is the new cpu defective? Or what?

 

[clutchc]

Are you still using the i3 cooler, or did you use the i7's cooler?

 

[Nx6595]

If your talking about the fan, I'm still using the same fan from the i3 to the i7. No cooler.

I think I fixed the fan problem by reseting the CPU. I removed the CMOS battery and unplugging the pc, then turned it on again. The fan speed seems to have lowered, especially when I go into the BIOS. Although, the sound is still louder than when I had the i3 installed. Is this normal?

Update: The pc doesn't load Windows OS and just reboots over and over.

 

[clutchc]

If your talking about the fan, I'm still using the same fan from the i3 to the i7. No cooler.

I think I fixed the fan problem by reseting the CPU. I removed the CMOS battery and unplugging the pc, then turned it on again. The fan speed seems to have lowered, especially when I go into the BIOS. Although, the sound is still louder than when I had the i3 installed. Is this normal?

Update: The pc doesn't load Windows OS and just reboots over and over.

Yes I'm talking about the fan which is also part of the heat sink cooler. You went from a 65W CPU to a 95W CPU. I would expect the temps to be hotter, especially if you have lowered the fan RPM. The i7 may require a bigger cooler.
As to the constant rebooting, it might be because something was previously changed in BIOS that is now reset to its default values. It could also be rebooting if the temps are out of bounds. I'd try putting the i3 back in and see if the system boots normally.

Can you boot to BIOS? If so, see if the BIOS has a section that shows CPU temp. I have a 790 SFF myself, but it has been awhile since I used it.

 

[Nx6595]

Yes I'm talking about the fan which is also part of the heat sink cooler. You went from a 65W CPU to a 95W CPU. I would expect the temps to be hotter, especially if you have lowered the fan RPM. The i7 may require a bigger cooler.
As to the constant rebooting, it might be because something was previously changed in BIOS that is now reset to its default values. It could also be rebooting if the temps are out of bounds. I'd try putting the i3 back in and see if the system boots normally.

Can you boot to BIOS? If so, see if the BIOS has a section that shows CPU temp. I have a 790 SFF myself, but it has been awhile since I used it.

I wasn't able to check the BIOS, but the temp before the reboot incident were around 38 C (idle temps; used Core Temp). I put the i3 back and now everything is back to normal.

 

[clutchc]

Then I doubt it was a temperature issue. But it is odd, because the i7-2600 is on the CPU support list for that PC. Any chance the i7 was defective? Bought used?

 

[weberdarren97]

If the i7 came with a cooler, use its cooler instead of the i3 cooler. If you use the i3 cooler, it's not enough for the i7, which would cause the i7 to overheat rather quickly, causing those annoying reboots.

Also, if you don't already have the most recent version of BIOS for that computer, then I would go to Dell's website and get it. You can punch in the service tag and it'll take you to your model, and show you if there are any available BIOS updates.

 

[Nx6595]

I bought the i7-2600 used (no cooler was included) and the system does have the latest BIOS (A18).

The temp does show that it wasn't overheating, so I'm suspecting the it might be defective. I'm just going to return it.

 

[clutchc]

I bought the i7-2600 used (no cooler was included) and the system does have the latest BIOS (A18).

The temp does show that it wasn't overheating, so I'm suspecting the it might be defective. I'm just going to return it.

I have the i5-2400 in my Optiplex 790 SFF. It is also a 95W CPU like the i7-2600. But I'm not sure if Dell supplied a smaller cooler with the i3 or if they just used the same one for all CPUs. I didn't see anything in the owners manual about changing the cooler when upgrading to the higher wattage CPUs.

 

[Nx6595]

I didn't find anything about cooler upgrade either. The cooler in the Optiplex 790 SFF is the same one that you see in the "Dell OptiPlex 790 Owner's Manual", which isn't small.

 

[weberdarren97]

Size is nowhere near the most important attribute of a cooler. What matters most is the quality of the base (sometimes referred to as the hot plate), the material used to connect the base to the fins, the presence of any heatpipes and what they are made of, and also the presence of a vapor chamber as well as what the chamber is made of. If you don't know these things, then I can't say that I can justify you saying that it's a good cooler.