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Are you saying that even old gpu doesn't work after inserting new one?
Since you are not online, request you to do the following:
1: Power off CPU and unplug cable from SMPS
2: Open CPU cover and Find CMOS battery in Motherboard
3: Remove batter from it and wait for 5 mins
You may press the power button in CPU so as to neutralize any remaining power in CPU. Press Power button 3 or 4 times
4: Insert CMOS battery > Make sure graphics card is inserted on same slot as it had earlier and seated correctly > Plug SMPS power cord and power on system
5: Check for display..
Please update status
Yes, it means it can accommodate power for 6pin as well 8 pin PCIE cards.
The only thing you must check is if SMPS is good enough to power those GPUs. The 8-pin is designed to supply up to 150W of power, the 6-pin only 75W. Besides you cannot power a 8 pin GPU with only 6pin connector.
The system will not simply work if GPU doesn't get proper powering from SMPS.
Please let me know if you have further query..
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