New PC Rebooting problem

[AtomicXC]

MOBO: ASUS Sabertooth X79 LGA 2011 http://www.newegg.com/Product/Product.aspx?Item=N82E16813131801
CPU: i7 3930k http://www.newegg.com/Product/Product.aspx?Item=N82E16819116492
GPU: GTX 670 http://www.newegg.com/Product/Product.aspx?Item=N82E16814130782
RAM: G.SKILL Ripjaws Z Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 2133 http://www.newegg.com/Product/Product.aspx?Item=N82E16820231456
SSD: Intel 330 Series Maple Crest SSDSC2CT120A3K5 2.5" 120GB SATA III http://www.newegg.com/Product/Product.aspx?Item=N82E16820167121

HDD: have 3 of them not connected atm
DVD: noc connected
LCD: BenQ XL2420T Black-Red 24" 5ms (2ms GTG) HDMI http://www.newegg.com/Product/Product.aspx?Item=N82E16824014270
PSU: Corsair HX750
COOLER: ZALMAN CNPS9900MAX-B 135mm http://www.newegg.com/Product/Product.aspx?Item=N82E16835118074
PSU: BFG Tech 650 W (not new item from old system) +3.3v 30A, +5v 54A, 12v1 20A, 12v2 20A, -5v 0.5A, -12 0.8A, +5VSB 2.5A



So My problem is computer rebooting when I am changing resolution from lower to higher , when any loads in gaming like sc 2 , when watching video basically system is unstable.It does not give me any BSOD just random reboots.

So I thought it could be PSU not enough watt for my video card but I checked some reviews l like this one http://www.overclock.net/t/1255509/could-i-run-a-gtx-670-on-my-520-watt-psu I undarstand that my card have to have +12v 30 A on a rail well I have 2 rails eache 20A so it should give me about 420Watt and my older video card GTX 275 I find out use more power then GTX 670 and it woked fine.
I have been able to stabilize my system to degrading my CPU speed in BIOS to 100 * 33 (multiplier for all cores) to 3300, I disconnect all my HD's only left one SSD Intel , discconect DVD/CD ROM and Case FANS put RAM in BIOS 1600 11 11 11 30 , so It does look like it is power supply but after calculating and looking to some forums I think 650 wats for my system should be enough.

I did memory test using W7 utility no errors, I put my older video card and it actually was worse cause more reboots (so I was thinking oh this card use more power so this is why) but again after reading forums Almost evryone saying that 650w sshould be good.
I am also running Hot CPU tester so far no errors on my hardware.....

I am thinking may be I over load one of the Rails like 3.3v or 5.5v rail I dont really understand what they are responsible for. I tried to look in to http://en.wikipedia.org/wiki/Power_supply_unit_(computer) but still cant figure this out.

I used this web http://extreme.outervision.com/psucalculatorlite.jsp to calculate what watts should be good for my system and I got like 547 I know it not so accurate but it should give me some idea....

So my question is it really power supply or what else I can do .
Sorry for my English it is not first language ...
Thank you

 

[flexxar]

It sounds like it could be due to overheating especially since under clocking stabilized it. I would download the Core Temp application and monitor the temperatures and make sure they are within the limits of your hardware.

 

[AtomicXC]

It sounds like it could be due to overheating especially since under clocking stabilized it. I would download the Core Temp application and monitor the temperatures and make sure they are within the limits of your hardware.

Thank you for reply
I forget to mention this sorry I am monitoring my CPU temp MB Video Card all them looks normal and I still do have reboots but not as much as with all my hardware connected to PSU like hard drives fans CD/DVD drive Floppy etc

My CPU right now on the test 70% load 38C MB 42 using AI Suite II , Video Card 57 C so I think it is not a temp issue

 

[flexxar]

Thank you for reply
I forget to mention this sorry I am monitoring my CPU temp MB Video Card all them looks normal and I still do have reboots but not as much as with all my hardware connected to PSU like hard drives fans CD/DVD drive Floppy etc

My CPU right now on the test 70% load 38C MB 42 using AI Suite II , Video Card 57 C so I think it is not a temp issue

You might be getting a BSOD even though you don't see it. Do these steps:

From the desktop right-click on My Computer.
Click the Properties option.
In the System Properties window click the Advanced tab.
In Advanced click the Settings button under Startup and Recovery.
In the Startup and Recovery window uncheck the Automatically restart check box.
Click Ok.

The next time it does it, you should probably see the BSOD. Even if you don't, look in %SystemRoot%\MEMORY.DMP and see if it tells you anything interesting.

 

[AtomicXC]

You might be getting a BSOD even though you don't see it. Do these steps:

From the desktop right-click on My Computer.
Click the Properties option.
In the System Properties window click the Advanced tab.
In Advanced click the Settings button under Startup and Recovery.
In the Startup and Recovery window uncheck the Automatically restart check box.
Click Ok.

The next time it does it, you should probably see the BSOD. Even if you don't, look in %SystemRoot%\MEMORY.DMP and see if it tells you anything interesting.

Thank you for telling this but unfortunately I wish this was it at list I would know what is going on, but yeah I do know about this and I did this and no BSOD errors codes ( thank you for helping me out any other thought very appreciated

P.S. I checked the C:\Windows\Minidump folder and there is nothing there no dmp file (I did make sure to turn on show hidden files and folders) so is it mean that my system didnt have crach because of some hardware issue of software?

 

[flexxar]

Thank you for telling this but unfortunately I wish this was it at list I would know what is going on, but yeah I do know about this and I did this and no BSOD errors codes ( thank you for helping me out any other thought very appreciated

Since the system is cutting off without BSOD, it is almost definitely a power issue. You probably have a faulty power supply. I've had a few do that to me. It is pretty common. You should buy a new one and try it out. If that does not fix it, you can probably return it.

 

[LFaWolf]

Since the system is cutting off without BSOD, it is almost definitely a power issue. You probably have a faulty power supply. I've had a few do that to me. It is pretty common. You should buy a new one and try it out. If that does not fix it, you can probably return it.

+1, power supply, or, maybe the power supply cord to the PSU is not tight/loose. Check that as well. I had the same issue a while ago with a Corsair PSU.

 

[AtomicXC]

Thank you for advice guys I ordered new PSU...

I did check like million times connections tails make sure everything is well connected same thing ... will update when new PSU arrive