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HP provides very little option to overclock CPU or RAM in BIOS.
If that is what you like then you may be disappointed.
You should be able to upgrade the power supply.
I have done this on HP PC's with good results.
Did see a power supply upgrade problem in this forum with the internal Ultra Slim DVD burner HP is now using. It has a non-standard power connection.
You can overclock an Omen. Your i5-660K is an unlocked processor.
The Intel Extreme Tuning utility should make it pretty straightforward.
Do a little reading on overclocking before you push it too hard.
The Thimpu motherboard in your system has a standard ATX 20-pin header on the motherboard. So the PSU can also be upgraded, but 500W is certainly enough power capacity for a beasty video card if you want to upgrade it.
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