I want to upgrade my old pc in order to be able to mine with it as well.
It has a Asus P5Q Mainboard - is there any GPU I could possible use to mine with that setup or do I need a complete new setup?
Thanks in advance
You will have some trouble here running many GPU-s mainly because of the limitation of DDR2 Ram which the max frequency can run is 1200mhz. Also get ready for some blue screen of deaths if you try to put more than 2 GPU-s on that kind of motherboard. Some friends of mine which work in a PC shop tried to mine with an old HP board with DDR2 Ram and ended with a lot of blue screen of deaths.
It has 3 PCIE slots but you have to try them to see if you can ran them all because at the ASUS website doesn't says anything for those PCIE slots. You can however run a GPU up to Rx 480 8GB I have tried myself with DDR2 ram old HP board , but maybe you can be lucky and run up to Rx 580 for mining.
P5Q chipset is P45....I got an older motherboard with a chipset of P35 with 4x 1080ti...that board is working for me since 2013..that's 5 years....and i bought it as a surplus/second hand.
It is ddr2 by the way..