HP Pavilion dv7-3078nr Fan replacement - Which Part?

[Helo412]

Cooling Fan is inoperative.  Receiving 90b error message.

I plan to order a replacement fan, but need to determine which part number to order.  Per the Manual:

1.  P/N 666527-001  (For use with computer models equipped with an AMD processor and a graphics subsystem with discrete memory)
2. P/N 666526-001  (For use with computer models equipped with an AMD processor and a graphics subsystem with UMA memory)

How do I tell if my laptop uses UMA or discrete memory? 

The laptop has an ATI Mobility Radeon HD 4530 Series graphics chip.  I understand that it has 512 MB of GDDR3 memory on the card.

From this I assume that this system is considered to have discrete memory and therefore I should replace the fan with part number  666527-001.

Please confirm the use of this part number or advise otherwise.  Thank you.

[Mumbodog]

Use device manager and check "Display Adapters" post what is in there please.

UMA is on board graphics (on the motherboard)

Discrete is an Add in Video card.

[Helo412]

Thanks for the reply.

Display Adapters:  ATI Mobility Radeon HD 4530 Series, as noted previously.

[Mumbodog · Accepted solution]

Sorry missed that, its Discrete 

[Helo412]

Thank you very much!!
I will order the appropriate fan assembly.