No, what you said is...
The PS3 can run multiplatform games better than a PC which does have those PS4 specs.
Which depending on your intended meaning is either so misleading it's not worth saying, or it's just plain wrong. What you said suggests that the PS3 runs games better than a PC with 8GB RAM and eight cores, but what it appears you're now trying to say is
If a game is poorly ported to the PC then it's possible that the PS3 will run that specific game better regardless of the specifications of the PC.
It's like me saying...
I can run faster than Usain Bolt
when what I really mean is
If someone else breaks Usain Bolt's leg then it's possible that I could run faster than Usain Bolt while his leg is broken.