Freezing/Sound Loop

Hello, well I will start off by stating my issue. When I play games, or watch YouTube videos, my computer will randomly freeze. This causes a "buzzing" sound and the only way I can shut off the system is to manually shut it off by holding the power button. I have Gtx460 sli cards (and the problem consists with just one card in.) I am leaning toward my power supply as it did not get the best of reviews of Newegg. The power supply is a XION 850W. It claims to be "SLI/CROSSFIRE Ready" but it only has 2 pci-e connectors, forcing my to use an adapter to use SLI. I am pretty sure it's just the power supply is poorly made and is what you pay for ($90). I am thinking of upgrading to the TX750W Corsair power supply.My temperatures when gaming are often around 50-70 degrees Celsius(using evga percesion x). My Specs will be below, leave your opinions please. :)

Motherboard: ASUS SABERTOOTH P67 (REV 3.0) ATX Intel Motherboard
Videocard(s): EVGA SuperClocked GeForce GTX 460 SE (Fermi) 01G-P3-1367-TR Video Card (192 bit)
Power Supply: XION AXP-850K14XE 850W ATX SLI Ready CrossFire Ready 80+ Bronze Modular Power Supply
RAM: CORSAIR Vengeance 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ16GX3M4A1600C9B
CPU: Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I52500K
HDD: Western Digital WD Blue WD5000AAKX 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive
Case: COOLER MASTER HAF 912 RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case

GPU clocks: GPU: 750MHZ
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More about freezing sound loop
  1. Any replies might be helpful, taking ALL feedback and ideas!
  2. if the buzzing is from the psu i would stop to use it an ask a rma for it or buy a new as you write
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