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PC rebooting during some games. (CPU OC & GPU OC= Reboot) (CPU OC & GPU no OC= Stable)

post #1 of 3
Thread Starter 
Hi everyone, been looking at posts on this site for years whenever I've ran into problems, and now I'd like some advice from you knowledgeable lot.

This is regarding my PSU even if it looks like an overclocking thread, serious.

Firstly:

CPU: i7 960 @ 4.2Ghz
Mobo: Asus Sabertooth X58 1304 BIOS
RAM: Corsair XMS3 6GB tri-channel DDR3 1600Mhz
GPU: EVGA GTX 580 SC
Cooling: Custom liquid cooling for GPU & CPU
System Drive: OCZ Agility 3 60GB SSD
Data Drive: WDC 500GB HDD
PSU: Tagan Piperock TG1100 BZ 1100W


Right, so I've just upgraded this from a 4 yr old X6800, 680i SLI, x2 8800GTX SLI pc so it can run today's games. I've got the i7 960 stable at 4.2Ghz with a multiplier of 21, Base clock of 200Mhz and Vcore of 1.42V.

I decided that I wanted to OC the 580 as well (BTW both GPU & CPU are cooled by custom liquid cooling following this path: Pump>CPU>120mm radiator>GPU>360mm radiator>pump & repeat. It's the same cooling I used before for my 8800GTX SLI build but with new blocks & coolant.

So... I manage to get the 580 to 1Ghz core clock with 4600Mhz mem clock voltage is 1.2005V and temps never hit more than 59C when stressing under Kombustor for 1 hour+. For some reason Afterburner & EVGA precision aren't saving the OC settings and when I load up a game, the card resorts back to stock clocks. I decide to make a custom BIOS for the card and input these settings into NiBiTor so it'll come out overclocked without the need for software. I finish that and flash the BIOS with nvflash. The card runs and PC boots up. Kombustor & EVGA OC scanner both stress the GPU to 100% and it appears rock solid. I load up BF3... BOOM, minimize to desktop (game still open in taskbar)& (no driver has stopped responding messgae BTW), load up Deus Ex: HR, same thing (again no driver has stopped responding message).

This time I run GPU Z and set it to make a log in the background. The game loads, card OC's to my custom settings then crashes. I look in the log file and apparently the GPU is nowhere near my specified 1.2005V! It'll be at about 1.168 with the core at full load, but as soon as there's any memory usage by the card, the voltage drops down to like 1.102V. I have the fan speeds at 0% in the custom BIOS I created so that no power is wasted going to a fan controller with no fan.

Ok, so next I down clock the card to 950Mhz Core and 4104Mhz mem clock and leave the voltage at 1.2V, flash this new BIOS, all is successful. Now I run BF3 or Deus Ex: HR and they both run fine. Still however in the GPUz log, the voltages are waay lower than the 1.2V that I had specified. I suspect that because I had the clocks lower, the lower voltages could support it.

Now however, whenever I play skyrim, the game will randomly reboot. Sometimes it'll be after 15mins, sometimes 1 hour. First it would reboot at the opening cutscene of the game every time. So I lowered the voltage to 1.5V. The game ran but it would still reboot but randomly now, sometimes if I opened the map, other times If I was talking to somebody.

So I lowered the voltage again to 1.125V. The game seemed more stable now however now BF3 & Deus Ex: HR wouldn't run! After finally re-flashing the stock BIOS for the card all games now work albeit not to the same performance.
I really think this is the fault of the PSU. It's a Tagan 1100W piperock modular one (http://www.tagan.com.tw/page/datasheet/BZ/TG_1100W_BZ_EN.pdf)

It's the second one I've had to buy. The first one I bought when I first built the 8800GTX SLI system but after a year it quit on me. I suspected it was my wall socket so I put a surge protector on the outlet and got a new PSU (the same one) this is the one I'm using currently so it's maybe 2-3 years old. I've just ordered a PSU tester from Amazon which should be here during the week.

Here are two different sets of readings for the PSU from my PC:

BIOS readings:

+3.3V - 3.264V
+5V - 5.088V
+12V - 12.081V

CPUID Hardware monitor & PC wizard readings:

+3.3V - 3.30V
+5V - 4.90V
+12V - 11.82V

Both report the CPU to be at 1.42V which is correct. I'm wondering if the age of the PSU could mean it's lost some of it's original juice and therefore isn't putting out enough volts to support a high OC?

Just looking for anyone's two cents on my problem. I know I can waffle on for ages, sorry bout that :/

Thanks in advance

-Mike.
Edited by anoma1y - 11/21/11 at 4:50pm
post #2 of 3
I believe that your power supply is limited in amps according to the specs on the 12V rail because it is limited 12Vx20A=240W and a GTX 580 pulls about 244W max stock. So overclocked GPU could very well pull 300w+ from the rail meaning you would need 12V @ 25A which is above the rated specs on your PSU. I could be wrong on this ,but I read some reviews on other PSU saying this was a problem.
Edited by bom - 11/21/11 at 6:08pm
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Intel Core i7-3770K 4.5GHz Asrock Z77 Extreme6 GTX Titan  2x4 GB Samsung RAM 2400MHz 
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My Lifesavings
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770K 4.5GHz Asrock Z77 Extreme6 GTX Titan  2x4 GB Samsung RAM 2400MHz 
Hard DriveHard DriveHard DriveHard Drive
3 X Hitachi 1 TB Western Digital Green 1 TB Seagate 5900 RPM 1 TB OCZ VERTEX 460 SSD 480 GB 
CoolingOSMonitorKeyboard
Custom Liquid Cooled Loop Windows 10 64 Bit QNIX QX2710 2560x1440 120Hz Rosewill Cherry MX Blue 
PowerCaseMouseAudio
Seasonic X-850W Power Supply Phanteks Enthoo Primo Logitech G502 Proteus Creative X-Fi Titanium Sound Card 
Audio
M-Audio BX5a Deluxe Speakers 
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post #3 of 3
Thread Starter 
Thanks for replying so quickly bom,

Ok that makes sense as I've seen some reviews of OC'ed 580's pulling 400+Watts. I think with my PSU, rails 5 & 6 are dedicated for the PCI-E connectors (as it's modular). It also says that under load the rails can be "combined" by an auto turbo function into a single rail which should in theory ramp up the amount of current that can be drawn?

Anyway, I'll wait for this PSU tester that I've ordered to come and test the PSU but I suspect I'll be needing to get a new one :/

Which of these would you recommend bearing in mind that I'll probably be adding another 580 to the system at a later date and overclocking that as well.

1. Corsair AX 1200 - http://www.scan.co.uk/products/1200w-psu-corsair-pro-series-gold-1200ax-modular-90eff-80-plus-gold-sli-crossfire-eps-12v-quiet-fan-

2. Silverstone SST-ST1200 - http://www.scan.co.uk/products/1200w-psu-silverstone-tech-sst-st1200-g-modular-90-eff-80-plus-gold-sli-crossfire-eps-12v-quiet-fan-

3. OCZ ZX 1250W - http://www.scan.co.uk/products/1250w-psu-ocz-technology-zx-series-zx1250w-modular-92-eff-80-plus-gold-sli-crossfire-eps-12v-quiet-f

All three are single 12V rail PSU's with more than 100A on that rail alone.
I'm kinda stuck between the Corsair & OCZ.

Thanks again
-Mike
Edited by anoma1y - 11/23/11 at 5:32am
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