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Not Enough Power

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June 14, 2010 2:21:04 AM

I own an OCZ GameXStream 850W and i've been getting lockups frequently, and after troubleshooting through many guides, I noticed that speedfan was giving me a 11.14V reading on the +12V rail. BIOS readings showed a 11.80V reading. Is this within the safe limit, or should I switch over to a better PSU? I've been looking at the:

Corsair HX850
Antec TP-750
PCP&C 750W Silencer

I'm running a:

Core i7 920 @ 3.6
GTX 285 @ 700/1600/1300
2 WD Caviar Blacks
6x2GB DDR3
ASUS p6T deluxe

UPDATE: Under Full Load (Furmark/Prime) It dips as low as 10.98V. I'm guessing this is too low?

More about : power

a c 713 ) Power supply
June 14, 2010 2:42:08 AM

Speedfan might be wrong and BIOS correct but the dipping under load is a lot compared to the size of the PSU and the actual power requirement. The ATX standard is +/- 5 %
a b ) Power supply
June 14, 2010 3:03:08 AM

or in between, a corsair 750 :) 
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a b ) Power supply
June 14, 2010 3:05:08 AM

what graphics card?
if its a powerhogging grapihcs card, corsair 850. if not, antec earthwatts 650
June 14, 2010 3:21:40 AM

Did you even read my OP?
a b ) Power supply
June 14, 2010 3:29:34 AM

yes i just missed the gfx card...sorry!
yeah i would say corsair 750w...
a b ) Power supply
June 14, 2010 10:56:21 AM

The ATX specification defines that your +12V outputs must be within 5% of their nominal voltages. Therefore your voltages should remain within this range: +12V (Min: 11,4V - Max: 12,6V). This means that your PSU performs out of specification.

On the other hand, here you have some good modular 750W PSUs:

ANTEC TruePower New 750W (by Seasonic)
CORSAIR HX750 750W (by CWT)
XFX Black Edition 750W (by Seasonic)
ENERMAX Modu87+ 700W
SEASONIC M12D 750W
SEASONIC X-750 750W
THERMALTAKE ToughPower XT (TPX-775M) 775W (by CWT)
SILVERSTONE Strider Plus (ST75F-P) 750W (by Enhance Electronics)

Taking in mind the price difference, I recommend you to go for the ANTEC TruePower 750W.

It presents a great efficiency (80 Plus Bronze certified) and a very good voltage stability (voltages are close to their nominal values). Moreover, the ripple and noise levels are extremely low.
It comes with semi-modular design (it presents too many cables permanently attached to the PSU). The modular connector board comes with 5 extra electrolytic capacitors from Chemi-con. Moreover, all wires are 18 AWG.
It supports even two very high-end video cards that require two power connectors each due to the four (6+2)-pin PCIe connectors. They get the power from two 25A rails (all for themself). This PSU is SLi certified by nVidia.
There are four independently regulated +12V rails rated at 25A each one (over current protected). The max. combined +12V rating is 62A (744W).
All electrolytic capacitors are Japanese from Chemi-Con (in the primary there is one capacitor (560µF, 400V) which is labeled at 85º C while the cpas in the secondary are labeled at 105ºC). In the DC-DC converter they have used solid aluminum capacitors. This PSU is based on a DC-DC converter on the secondary (in charging of converting the +12 V output into +5 V and +3,3 V). This is the same concept used on the Seasonic M12D 750W and the CORSAIR HX750. It increases the overall efficiency of the power supply.
The PSU performs rather quiet at below 60% of its max. load. It has a 120mm double ball bearing fan from ADDA (AD1212HB-A7BGL). It is a high-speed fan with a maximum rotational speed of 2200RPM. The fan speed is automatically controlled by the internal component temperature due to an onboard PWM speed controller. Anyway, if you are a fanatic of the silence, you should look for another option.
Finally, It has five years warranty.
In summary, this is a very reliable product with very good overall performance. Taking in mind the affordable price, the ANTEC TruePower 750W would be my choice.
a b ) Power supply
June 14, 2010 1:01:47 PM

From reviews of your product, it sounds like the PS is certainly out of spec. If it is n warranty I would send it back. If that is not an option buy the Antec. Just curious, do you have a battery backup, ups or surge protector that you are connected to? If so try plugging in to the outlet direct and see if it makes a difference.
June 14, 2010 3:40:37 PM

I've already RMAed another one of these power supplies, so I do not feel comfortable with OCZ power supplies anymore.

I've also been looking at the Corsair HX 850W, from what I've read in this thread, I'm stuck between the HX 850W and the TP-750. Can someone help me decide?
June 14, 2010 3:53:39 PM

Yep I have had that problem as well They dont seem to produce enough voltage on the 12v.
a b ) Power supply
June 14, 2010 5:18:51 PM

i would say the hx850
!