And I planned to get more VGA cards on this rig so do you think this is possible to have them on the same rig?
Yes you can do it.
If there is a mixture of GPU series/brands in the same RIG. Usually, one or two GPUs are detected or can be detected by all GPUs. If some GPUs are not detected, then try to install drivers one by one.
Sometimes when all GPUs are detected, while running mine, there is a GPU hashrate that is down or readable 0. If that happens, try selecting the latest or compatible driver mining until all GPUs have a normal hashrate.
Good luck.
Thanks for your quick reply. I have one more question regarding choosing a computer. I had two option below, which one do you think would support for those VGA Cards? They have at least 3 PCI-slots.
Model: Dell Optiplex 990/790 mini (1)
CPU: Intel core i5-2400 3.1Ghz
Ram: 4GB DDR3
HDD: 250GB
Optical: DVDRW
All the ports: Back 6USB2.0 - Front 4USB2.0 , LAN Port, eSATA, Display Port, Serial Port, Headphone
Dell Optiplex 960 (2)
Intel Core 2Duo 2.6GHz
Ram: 4GB DDR3
HDD: 250GB
VGA: Intel Q45 Express
Optical: DVDRW
All the ports: 8 USB, LAN Port, eSATA, Display Port, Serial Port
Thanks
Somvannda