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Need help running 4 Screens from 2 GPUs

post #1 of 2
Thread Starter 
Hey all.

I've been running this system for quite a while, and just bought a cheap HD 5450 to drop in in the hopes of running 4 monitors (I have 2 active now).

My main card is a Sapphire 4870 2GB edition. It has VGA, HDMI, and DVI outputs, however only 2 can be active at the same time. I currently have a 24" Hanns-G 1080p screen and a 23" Acer 1080p screen plugged into the HDMI and DVI outputs.

I just installed a Sapphire HD 5450 into PCI-e slot 4 (To maximize airflow to the more powerful 4870. This card also has VGA, HDMI, and DVI outputs. I have a second 23" Acer 1080p screen plugged into the HDMI slot and an old Compaq 17" screen running off the VGA port.

On first boot up everything went fine, however only the 2 screens plugged into the 4870 were active. I opened AMD Vision control center to see if I needed to activate the second GPU somehow, but didn't find any options. I then downloaded and installed drivers for the 5450 to see if that would help (Version 13.8) After installing the new drivers I restarted from the prompt. Upon boot up it appeared neither GPU's drivers were working, both showed up in Device Manager with yellow exclamation points next to them.

I uninstalled both drivers and reinstalled my 4870 drivers so I'm back to where I was at the beginning, just with an added card not doing anything.

Any thoughts on what I can' do to fix this?

Thanks
post #2 of 2
I'm pretty sure you need will need SoftTH to run 4 monitors from 2 different cards, usually all the monitors have tro be plugged in to the main card.
Ghost
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Ghost
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CPUMotherboardGraphicsRAM
Intel Core i5 - 3570k [4.7GHz] MSI MPower Z77 EVGA GTX 670 [1280MHZ] 2x Corsair Vengeance 4Gb  
Hard DriveCoolingOSMonitor
2x 2Tb WD Caviar Green Corsair H100 [4xBitFenix Specter W] W7 Ultimate 64Bits Crossover 3020MDP 
KeyboardPowerCaseMouse
Steelseries 6G v2 PowerColor PX 1000W  Dimastech Bench Table Easy 2.5 DUAL Corsair M90 
Mouse Pad
Razer eXeMat X Control 
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