TJ Hooker :
bwinzey :
Yes they'll perform well. Dual processors only help when you have multi-threaded games, which are rare. For $100 you are getting a LOT of performance. Your CPU's definitely won't be a bottleneck. The PSU is server-grade (and so is the whole computer) which means it will probably last for a really, really long time.
An i5 2400 has a bit more power than 1 e5450, but two would beat it. You'll be able to run your GPU to it's max power, and you should expect to get the all the performance that the card can deliver.
Out of curiosity, how much RAM does it have?
Those CPUs came out 9 years ago. If you want to see how 8 weak cores perform, look at something like an FX-83xx, which is routinely outperformed by an i3 in gaming. Now imagine those cores had significantly worse IPC, and were clocked significantly lower. That's what dual e5450's will perform like.
Why do you say they are weak cores? Because they're old? An FX-8XXX, which was designed in 2011 is obviously going to be outperformed by a 1-year old i3. Compare them to similar processors and then make such claims.
My last computer had an OC'd FX-8120 at 4.0GHz
My new computer has 2x E5-2670s at 2.6GHz
Even when using only 1 equally-cored, lower-clocked processor, I have about 3x the power of the FX processor. Sorcery? No, they're just well-designed.
The E5450 processors, while old, were extremely powerful for the time they were made, hence the $1,000 price tag when they came out. Obviously they are older than the i5 2400, but benchmarks show just a slight difference between the i5 2400 and a single E5450. Having two processors doubles your performance, so my claim still stands, that it will perform better than a i5 2400. He has a GTX 650ti, which will be the the bottleneck long before the processors will.
My processors, while only clocked at 2.6GHz, paired with an R9 390x, get no more than a 0-10% drop in FPS compared to the glorified i7 6700k.
Again to what you said, an FX-83XX would run perfectly with a 650ti so I'm not sure what the problem is here.