Will a Xeon 2620 v3 bottleneck a Nvidia GTX TITAN X 12GB

Solution
Yes.
You can easily find situations where that CPU is slightly bottlenecked.

Due to the number of cores it has a base clock of 2.4GHz and Max Turbo of 3.2GHz (with say THREE cores running it might be about 2.9GHz)

If you need those threads for non-gaming then weigh your pros and cons carefully. It is however a very POOR CHOICE if being used mainly for gaming.

An i5-6600K would work better for gaming, to be clear.

Compare TOTAL vs SINGLE:
http://www.cpubenchmark.net/cpu.php?cpu=Intel+Xeon+E5-2620+v3+%40+2.40GHz
vs
https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i5-6600K+%40+3.50GHz&id=2570

The FX-6300 can drop a game over 40% vs a good Intel CPU and it's single thread performance isn't much lower, in fact it's often overclocked...
Yes.
You can easily find situations where that CPU is slightly bottlenecked.

Due to the number of cores it has a base clock of 2.4GHz and Max Turbo of 3.2GHz (with say THREE cores running it might be about 2.9GHz)

If you need those threads for non-gaming then weigh your pros and cons carefully. It is however a very POOR CHOICE if being used mainly for gaming.

An i5-6600K would work better for gaming, to be clear.

Compare TOTAL vs SINGLE:
http://www.cpubenchmark.net/cpu.php?cpu=Intel+Xeon+E5-2620+v3+%40+2.40GHz
vs
https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i5-6600K+%40+3.50GHz&id=2570

The FX-6300 can drop a game over 40% vs a good Intel CPU and it's single thread performance isn't much lower, in fact it's often overclocked to similar that of the Xeon:
https://www.cpubenchmark.net/cpu.php?cpu=AMD+FX-6300+Six-Core

Based on these numbers it's very easy to estimate 10% or greater losses in some games (vs say an i5-4690K or i5-6600K).

Summary:
I suggest paying careful attention to the numbers as they don't tend to lie. It's just not ideal for gaming. Unless you're using almost the entire processor for converting video or a similar task then it's a very poor choice of processor.
 
Solution

cdiezv00

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That is one of my concerns. Most of situations I'm not going to be using all the cores. I have been thinking of replacing the OP CPU with http://ark.intel.com/products/82764/Intel-Xeon-Processor-E5-1630-v3-10M-Cache-3_70-GHz

Two less cores but higher clock speed, that might help. What do you think?