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[ubuntu] [KVM] PCI GPUs have the same device ids. Why? How to change the ids?

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I've got two R9 280's installed in my system. In Ubuntu when I run
Code:

lspci -nn
both the cards have the same device id.


Example Output:
Code:

01:00.0 Example GPU 1 [8080:aa68]
04:00.0 Example GPU 2 [8080:aa68]

Notice the device ids "8080:aa69" are the same. So my question is why are the ids the same? I'm trying to pass through one of the cards to kvm but both get passed because the ids are the same. So what could I do to solve this?
I've tried
Code:

setpci
but it doesn't change the id. I've also tried
Code:

echo "8080 aa68" > /sys/bus/pci/drivers/radeon/new_id"
but then I get a error
Code:

new_id file exists
if there is no way to the the device id then how can I only passe one card to kvm?

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