GeForce GTX 660 superclocked SLI crashing computer?

I recently got a new GTX 660 GPU and i'm having a problem where my computer will completely shut off when i play graphically taxing games such as skyrim and assassins creed black flag. When i play other games like minecraft it will run fine and never crash the computer and it will run around 60fps. To test it out i installed shaders which made it much more taxing on the gpu and crashed after about an hour of playing. After i loaded it again it crashed only seconds into it. With skyrim and assassins creed it crashes seconds into playing. I've looked online for people with similar problems and i think that the issue might be my power supply which is CORSAIR CX CX500 500W ATX12V v2.3 80 PLUS BRONZE. I'm stuck however and don't know for sure if this is the problem since with research i've heard so many different things about the PSU's. The minimum for the card is 450W and on another post about a similar problem some of the comments insisted he should have at least a 700W. This video here made me think that my PSU isn't the problem at all: . While this other video made me think i probably should get around a 700-750W PSU: . If any one can help id really appreciate it!

Added (1). Another thing to note is that i tryed my card in my buddies computer and he has a 600W +80 bronze and the card ran perfectly fine for about half an hour on skyrim. Also my heat when it crashes is like 40-50 C.

Minecraft help. Sticky piston won't work?

I'm trying to make a gate in front of a castle that I'm building but it's not working because only one of my pistons works!

In the front I have about 20 sticky pistons facing up with fences on them (as the gate), but when I hooked up the lever and the redstone only one of them works… How do I fix that? It's really starting to get on my nerves

Added (1). Tyvm but now they won't turn off lol

My CPU automatically goes from 3.5GHz to 1.7GHz?

I overclocked my i5-2500k from 3.3GHz to 3.5GHz and my RAM from 1333MHz to 1600MHz using the Asus P8Z68-v Pro/Gen3. When I go into windows, the CPU is using around 50%, as it says in task manager. When starting CPU-Z, it says 3500MHz for a second, and then it turns into 1600MHz. Why is this happening? I tried to use ASUS AI Suite II, and the same thing happened. I feel like the pc is very unstable, because it's lagging on Minecraft, and I have the Geforce GTX 680 4GB Graphics card. I get the beep from the speaker when I turn on the computer, and that means the hardware is okay, right? Any help/suggestions?

How does minecraft generate endless worlds?

I know they're not endless but they are HUGE, because while you go in a direction its generating land, until it gets glitchy or something (haven't played pc version).

How do they do that? What's it called? How do I learn to do that on a computer language? How complicated is it? And can any language do that? (if not, which ones do?)

What's the average fps for minecraft?

I wanted to know so I know if my computer is bad or good

Do I have to buy minecraft to use commands?

I'm able to play minecraft without purchasing it and I'm able to use some commands but i'm not able to use most commands, it says command unknown. Is this because I haven't bought the game on the computer?

Does Minecraft log out when you shut down your laptop (Mac)?

I've been wondering this because I haven't been shutting down my mac a lot so I thought I should make this a habit, but I'm worried that Minecraft will log me out of my account.

I hate some minecraft music?

Can i remove some minecraft music?

Blue screen of death problem?

I just got a new gaming pc 2 weeks ago and last night I got the blue screen of death while playing minecraft with some friends. I downloaded a hacked client ( my friends have it and said its safe) but that was it, 20 minuets later a blue screen with not much writing appears for a second and my pc restarts.
Now when I turn it on it a high pitch wine followed by a beep repeatedly and fails to find windows. It found it once this morning but started scanning the c drive and me being impassant and frustrated closed it when it stopped at 55 on part 2/3.
I can't get back onto it now because it won't recognise windows.

Is the 15-n278sa good for gaming?

http://www.pcworld.ie/Product/HP-Pavilion-15n278sa-156andrdquo-Laptop-Silver/317047/1.9
i'm buying this laptop in the next few weeks and i wanted to know is this good for gaming.
i want to play games such as gta 4, minecraft, dirt 3 and driver san francisco.
would this laptop be good for it. I don't want to play them on max resoliution but at least at low-medium graphics