ASUS P5Q Pro compatible with HD7870 (Tahiti LE)?

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pieman7

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Jan 12, 2011
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For years I've had an ASUS P5Q Pro running with 2 x HD 4850 in x-fire. Since these cards do not support DirectX 11, it would not run COD Ghosts. So I tried to upgrade with PowerColor PCS+ AX7870 2GBD5-2DHPPV3E Radeon HD 7870 MYST. Edition (Tahiti LE) 2GB. I plugged it in and no POST, just a blank screen without beeps or anything. All the devices are getting power, but it just won't do anything. PS is a Zalman 600W which should be enough. After some digging around I read there is a potential issue with P5Q Pro not supporting UEFI. Does anyone actually have a P5Q motherboard running an HD 7870 (Tahiti LE)? Or should I just resign to the fact that this newer video card is not compatible with this older motherboard? I figure that I have the following options:

1) Spend time figuring out how to get this card to work with the P5Q Pro, if it's even possible.
2) Buy a newer motherboard, which would also mean buying newer CPU & RAM. (Expensive)
3) Buy 2 older Radeon cards that support DirectX 11 and run in x-fire. (returning the HD 7870)

I'd like to keep the P5Q Pro because it has served me well, and still plays all the other games to satisfaction.

Suggestions?
 
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coozie7

coozie7

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Jun 2, 2007
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Should work, the P5Q is a PCI-E 2.0 motherboard and the PSU is more than capable of running the 7870 LE.
Try the obvious first:
Reseat the card and check you have not accidentally dislodged something.
Try other video connectors: Use the other DVI plug, if the monitor supports a VGA connector try that and try using a VGA/DVI converter, some cards have these in the box bundle.
Have another dig and try to update the motherboard BIOS. Be aware that updating a BIOS is risky, do NOT proceed unless you feel confident, mess this up and you can brick the system.

 
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ZionZA

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Nov 5, 2013
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Changing ports won't affect the fact that his system isn't even able to POST. Bios update won't brick the system. Just the motherboard if done incorrectly or power goes out etc
 
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pieman7

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Thanks for all who responded.

I tried the 7870 LE on a newer motherboard and it worked fine.
So I went back to the P5Q Pro and tried putting one of the old 4850s back in...and nothing. So what the heck? Disconnected everything from the P5Q, took it out of the case and inspected the possibility of any shorts. Started testing each component. Still nothing.

Then I tried clearing the CMOS RTC RAM. SUCCESS!!!

Installed the 7870 LE and slowly put all the components back together. Updated the ATI drivers. The HD7870 (Tahiti LE) is now running just fine on the ASUS P5Q Pro!

 
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