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OCZ StealthXStream 2 600 W Power Supply Review

Last updated on September 12th, 2010 at 10:23 pm

Additional technical assistance: Peter McFarland and Jeremy Price.

Correctly testing power supplies is a complex procedure and KitGuru have configured a test bench which can deliver up to a 2,000 watt DC load. Over the coming months this configuration is likely to be adjusted further and fine tuned. Ambient room temperatures are kept to a ‘real world’ realistic condition of 25c with air conditioning.

We use combinations of the following hardware:
•  SunMoon SM-268
•  CSI3710A Programmable DC load (+3.3V and +5V outputs)
•  CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)
• Extech Power Analyzer
• Extech MultiMaster MM570 digital multimeter
• Extech digital sound level meter
• Digital oscilloscope (20M S/s with 12 Bit ADC)
• Variable Autotransformer, 1.4 KVA

We are running all four 12V rails into one final test result (12v)

DC Output Load Regulation

Combined

DC Load

+3.3V
+5V
+12V
+5VSB
-12V
A
V
A
V
A
V
A
V
A V
115W
1
3.32
1
5.01
8
12.10
1
5.01
0.5 -12.19
355W
4
3.30
4
5.00
26
12.02
1.5
4.95
0.5 -12.02
480W
6
3.27
6
4.97
35
11.95
2
4.91
0.5 -11.86
601W
8
3.19
8
4.91
44.5
11.79
3
4.88
0.5 -11.78
OCZ 600W Maximum Load
719.5W

The PSU remained stable, even at full load and the results fall within safe parameters and guidelines. At a sustained 600W the unit was rock solid for many hours. We then cranked our testing equipment to see how far we could push it, the PSU turned off at around 720W which was around 20% over its rated maximum figures. Anything higher and it would shut down immediately. The Overcircuit protection system worked well which is good to see.

We then used an oscilloscope to measure AC ripple and noise present on the DC outputs. We set the oscilloscope time base to check for AC ripple at both high and low ends of the spectrum. ATX12V V2.2 specification for DC output ripple and noise is defined in the ATX 12V power supply design guide.

ATX12V Ver 2.2 Noise/Ripple Tolerance
Output
Ripple (mV p-p)
+3.3V
50
+5V
50
+12V1
120
+12V2
120
-12V
120
+5VSB
50

Obviously when measuring AC noise and ripple on the DC outputs the cleaner (less recorded) means we have a better end result. We measured this AC signal amplitude to see how closely this unit complied with the ATX standard.

AC Ripple (mV p-p)
DC Load +3.3V +5V +12V 5VSB
115W 10 10 20 15
355W 15 10 25 20
480W 15 15 30 25
601W 20 20 35 25

The ripple results fall well within a ‘pass’ rating and these are very good, particularly for a product in such a competitive price bracket.

Efficiency (%)
115W
86.2
355W
87.1
480W
85.4
601W
83.3

These efficency ratings are very close to the figures that OCZ quoted and they are actually within the 80 Plus Bronze certification. OCZ have modestly classed this unit as a 80 Plus Standard certified unit – however we saw peaks of 87 percent at around 280-350W.

We take the issue of noise very seriously at KitGuru and this is why we have built a special home brew system as a reference point when we test noise levels of various components. Why do this? Well this means we can eliminate secondary noise pollution in the test room and concentrate on components we are testing. It also brings us slightly closer to industry standards, such as DIN 45635.

Today to test the Corsair Power Supply we have taken it into our acoustics room environment and have set our Digital Sound Level Noise Decibel Meter Style 2 one meter away from the unit. We have no other fans running so we can effectively measure just the noise from the unit itself.

As this can be a little confusing for people, here are various dBa ratings in with real world situations to help describe the various levels.

KitGuru noise guide
10dBA – Normal Breathing/Rustling Leaves
20-25dBA – Whisper
30dBA – High Quality Computer fan
40dBA – A Bubbling Brook, or a Refridgerator
50dBA – Normal Conversation
60dBA – Laughter
70dBA – Vacuum Cleaner or Hairdryer
80dBA – City Traffic or a Garbage Disposal
90dBA – Motorcycle or Lawnmower
100dBA – MP3 player at maximum output
110dBA – Orchestra
120dBA – Front row rock concert/Jet Engine
130dBA – Threshold of Pain
140dBA – Military Jet takeoff/Gunshot (close range)
160dBA – Instant Perforation of eardrum

Noise (dBA)
115W
27.5
355W
28.9
480W
33.1
601W
38.3

These low levels are very good and only when the unit is loaded to 450W or higher does it become that noticeable. This was obviously in our silent testing environment, under real world conditions with a few case fans you will not hear the PSU until around 75%+ load.

Exhaust Temperature (c)
115W
27
355W
32
480W
37
601W
44

Exhaust temperatures are once again very good indeed and again it only really starts to get warm when at 75% load or higher. When we hit 90-100% load the air coming out of the back of the PSU was relatively warm. Again this isn’t a viable real world condition, if you need 600W of constant power, aim higher up the wattage chain.

Maximum load
Efficiency
719.5W
80.3%

Out of interest we lastly decided to measure unit efficency at our maximum rated figure of 719.5W and were pleasantly surprised to see figures of just over 80%. This is not a real world situation incidentally, you would not be running a 600W power supply at 720W long term.

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18 comments

  1. I cant get over the price of this, that is very cheap. especially for such a well constructed unit/

  2. OCZ are onto another winner I see, the original unit was very good value as well, especially at the price. nice to see they improved this one and didnt mess it up.

  3. The addition of an 8 pin PCiE makes huge sense, it was what has been putting a friend of mine off buying one for a while, even though the price was right. glad to see they have maintained the good regulation throughout.

  4. This is an absolutely brilliant release from OCZ and while i adored the review of the corsair AW1200 on kitguru recently, that is as much as I would pay for a graphics card, or more! this is priced just right and will handle even a GTX480. love it, and stellar review again.

  5. Well color me impressed with this PSU, first review ive seen of it online, didnt know they even had a new range. Excellent product by the looks of it.

  6. what a great product at an even better price. I used to have an OCZ PSU, never had any problems with it either, would recommend them or corsair.

  7. This is really very hard to fault at such an incredible retail price. you dont get this kind of quality normally at such a low price. just shows you though how many people chase wattage figures when you dont really need it. 600-700w is more than enough for anyone today, unless they are into high end SLI or CFX

  8. I love kitgurus PSU reviews. so informative for both experienced and novice users. conclusion alone had me sold, shall hunt this out for my brother for his system soon.

  9. Very very solid product from OCZ and as everyone else has said, it is hard to fault for that price point. normally you end up with a fung wung no name easter make at £50.

  10. My PSU died last night! this looks to be a good shortlist option, as well as the slightly more expensive Thermaltake 750w reviewed here a few weeks ago.

    What do you guys think, 600W enough for futureproofing? might be a bit tight.

  11. Is that price right? that seems very good pricing from OCZ, they aren’t normally so cheap.

  12. Nice looking PSU too, isnt it? those enermax ones lately are like blinged out and look awful

  13. I had a b ad experience with a gamesstream unit years ago and I swear I will never touch OCZ again, it caught fire and starting smoking. I am sure this is good but once you get burned like that, you never go back.

  14. Great review, looks very competitively priced and performance is more than enough for anything today, apart from dual GFX configurations

  15. Great review, time for an order for my new system with a GTX460 in it 🙂

  16. Great review of this, I only found a few reviews online and both say its great/ OCZ have my money 🙂

  17. SO many wonderful products reviewed on this site, great the ‘crap filter’ for rubbish products means other sites get the tosh 🙂

  18. Found this site from google, cant imagine ive never seen it before, bookmarked!