I am having a weird issue pertaining only to this piece of hardware Intel CT desktop adapter(pci add in NIC card). 
 
I originally discovered this issue after receiving reports that the PC's were either "locking up" or restarting. 
checking the dump files I see a message that says the physical adapter was removed. This is obviously not happening. Its seems likely/apparent that an IRQ conflict is causing these lockups but I cannot find a way to provide definitive proof of this.   
 
The only anomaly with this device is that it shows as having multiple IRQ assignments in both msinfo32.exe and through the device manager.
 
I have access to at least 10 different machines all identical in hardware running windows 7 with these adapters installed. These are Dell XE'2 spec'ed identical with the exception of the PCI NIC cards that were added after deployment. All have various IRQ's assigned to them most have 6-7. Some as many as 21. They are all running the same driver and I have tested both older drivers and current drivers, Each card will install the same seemingly random number of IRQ's as it had before even after multiple uninstall and reinstall.
 
I also have at least another 10 in my lab with various other brands of PCI add in NICs (broadcom, SIIG etc.) that do not do not have mutliple IRQ.
 
Searching the net and various other machines I have access to, I cannot find any other machines with devices that list having more than one IRQ assigned to it. This specific device on these machines seem to be an anomally. 
 
Why would this PCI card have multiple IRQ's?
Why the random IRQ conflicts or PC lockups?
How can I test to prove that this is the cause of the failure?
 
Anyone have any insight or thoughts on this?  
 
I am open to any thoughts as I am currently at a loss as to how I can reproduce the conflict in my lab as its seemingly random and or why this one device would have more then one. 
 
I have already switched the cards to different slots tried older versions of drivers and added other brands of cards into the same machines having this issues and when I place the intel NIC's back in the pc they present with multiple IRQ again. the same number as before. 
 
 

What is the Full Model Number of this PCI Network Card? 
Intel® Gigabit CT Desktop Adaptersku 893647
 
this is the full part number according to the card in my hand and intels website.

Did you reset your Motherboard Bios after you installed this Card? NO. This is across multiple PC's that are placed all over the country and 10 in my local lab

Are the Onboard Network Cards disabled in the Bios? NO, These are used in tandem with the PCI add-in cards as dual NIC's are required for there intended purpose.  
What OS? ALL windows 7 machines service pack 1 all identical levels of updates
 
You Covered you Other Intel Net Cards in your Image. This was by accident ill upload new images. The onboard NIC is an intel I217-LM. 

After you installed this (PCI Card) did you reinstall the Chipset Software? Yes. the chipset drivers were updated after the cards were installed 

Yes my fault they are 
 

NO worries I should have said PCIe

If you know are the PCIe Slots that you installed this Network Card in a Shared Slots?
And if so what they are sharing with?

Here is the two slots available. I have tested in both with no change. 
 
 

PM Sent

So after a little reading I am seeing in the SFF version I am using. Both expansion slots are PCIe but I cant find any documentation about them being shared. 
 
Thanks for checking Bcav. 
 
If you can solve this there may be a prize :)

Ill check bios to see if I can disable serial
 
 

If not using vPro Technology can you disable this in the Bios as well, I am not sure if it even uses an IRQ Address.
Intel® vPro Technology (iAMT 9.0) including Dell unique vPro extensions (The integrated Intel connection is required to support Intel® vPro™ Technology.); 
 
I am looking now on what card this is below
 
supports optional PCIe 10/100/1000 network card,
 
Maybe! Dell System Board (Motherboard) for OptiPlex Xe2 Minitower (Refurbished) Mfr P/N YC9KY

 
Is this Your Motherboard?
If you are NOT using the PS2 Ports Disable them as well.

MB or OS controlling the IRQ assignments ?

There is no setting in bios to disable Intel® vPro Technology or the PS2 ports

Awesome! thats the one. 
 
 

So here is some bummer news. 
 
Dell tells me "The Intel Gigabit CT desktop adapter is not supported by Dell"
 
They will not tell me why or if there are known issues. 
 
MY BAD- thing is this doesnt help me prove that this is actually the cause of the PC lockups. I can spend the time and money replacing them all only to find out the PC's are still unstable.   

Can I ask what is wrong with the onboard Nic? 
 
I havn't dealt with the XE2 at work, but we have these models deployed
 
745
755
760
780
790
7010
7020
7040
980
990
9010
9020
 
And all of them are equipped with a gigabit nic onboard and are extremely stable. Also consider ditching the Dell Image, and creating your own Enterprise Image from scratch.