So your PSU is a parts killer, as in it can't really output 450w, more like 300w and has a huge possibility of frying your parts when (not if) it prematurely dies.
MSI eton et886 is not a GPU model number, maybe some information on a stciker/chip somewhere but that is not the model number.
How are you certain there is no integrated graphics in the CPU if you have no idea what it is? Most all intel CPUs have an integrated graphics chip in it and then it outputs to the motherboard. The only way to be certain with zero idea of what the cpu is, is if the motherboard ports on the back (where usb and audio is) does not have any video ports.
Can you find your old cyberpowerPC purchase receipt, that should likely tell you what is in the PC, or at least provide a cyberpower PC model number so we can get an idea what is in there.