PSUs haven't really changed much over the past several
years. Other than form factor changes and increased power output,
a typical PSU today isn't that much different from one of five
years ago. We may get UV covers and cables, LED lights, but generally,
you stick one into your case and plug in the necessary power cables
and pray you didn't buy a bunk one that will fry your system.
With system cooling becoming more of a challenge
to manage, it's strange that it wasn't until recently we've began
seeing more modular PSUs. The basic goal of these PSUs is to reduce
clutter from cables by hooking up only the cables you need. The
purpose is to eliminate not only the unsightly leftover cables
typical in a PC setup, but to also improve system airflow by having
fewer cables obstructing case fans.
We've already looked at a few modular PSUs from
Antec and Ultra Products this past year, and today we take a look
at OCZ's offering. Their PowerStream line was quite impressive
when we last looked at it, so let's see if their ModStream
continues to build on their PSU reputation.
While the PSU is modular, OCZ dubs this EZMod
technology, which is their name for the technology. The OCZ
ModStream differs from the last modular PSU we've looked at
where the primary ATX power cables are attached to the PSU.
The Ultra X-Connect we reviewed earlier this year was fully
modular and had all its cables "detached". Like the
X-Connect, the OCZ ModStream is polished to a brilliant shine.
While we knocked the ModStream for not being fully
modular, this is not really a big deal to be honest as the main
ATX cable(s) and the +12V connection are all required for most
PC setups, saving you time attaching cables to the PSU that
you already need. Note that there are two cables for 20 and
24-pin connections, rather than a single 24-pin connection and
20 pin adapter. I suppose this is the only real flaw in not
making these cables modular as at this time, the extra four
pins are not required for Athlon motherboards.
For cooling, OCZ took the silent approach (not
truly silent, but relatively silent) to cooling. The rear of
the PSU features a diagonal grid screen to allow air to exit
the PSU. Since the entire rear is perforated, quite a bit of
hot air is allowed to pass, and while a rear fan will accelerate
airflow, it would be a noisier solution. The 120mm blue LED
fan is the ModStream's intake fan that draws air in from the
system and out the back. Overall, under our testing environment,
the setup works as advertised, with little noise and warm (not
hot) air coming from the back.
In a separate box, OCZ packages the rest of the
cables needed for most installations as well as a manual (very
well written I may add), zip ties and Velcro wraps for cable
management, and a modded (modded for a PSU anyway) power cable.
The EZMod power cables included with the ModStream are: One
cable with two SATA connections; one PCI Express 6-pin connector;
one point-to-point 4-pin cable; two dual 4-pin cables; one 4-pin
(Molex) and Floppy cable. All the EZMod cables are EMI shielded
(discussed shortly) and UV ready assuming you have the required
lighting.
The OCZ ModStream isn't all about the bling though,
as the unit itself features all the modern features enthusiasts
demand out of their power supplies. The unit we received is
rated at 520W (620W peak) and their "entry" model
is rated at 450W (550W peak). For those of you outside North
America, the PSU features Active PFC, but all models have OCZ's
PowerShield EMI Control Technology (copper shielding to reduce
electromagnetic interference) and a 3 year PowerSwap replacement
program.
The
ModStream feeds 336W on the 12V rail, and 260W on the 5V and
3.3V rails. OCZ has built the unit so that if your requirements
are higher on the one rail, such as the 12V rail (water cooling
and the like) the overhead is available, likewise, if you require
additional 5V appliances (PC Cards etc.), there is overhead
available on that rail as well.
Testing
MSI 915P: Intel Pentium 4 560, 1GB Corsair DDR2,
2 x Seagate 160GB, Seagate 120GB, MSI X800XT, MSI 16X DL, AOpen
CDRW 52X, Koolance PC3-720SL.
To load up the system, we run Prime95 run for
20 minutes, with Folding @ Home running in the background, as
well as ripping Jet Li's Hero DVD to the Seagate RAID setup.
Voltages were monitored with ABRA DM-9700 multimeter. The comparison
PSUs are the Ultra X-Connect 500W PSU and Cooler Master's RealPower
450W. The P4 560 will be clocked at 18x215 for all testing.
Idle
|
+3.3v
|
+5v
|
+12v
|
| OCZ
ModStream |
3.29
|
5.03
|
12.03
|
| Ultra
X-Connect |
3.26
|
5.03
|
12.02
|
| CM
RealPower |
3.30
|
5.05
|
12.03
|
Load
|
+3.3v
|
+5v
|
+12v
|
| OCZ
ModStream |
3.27
|
5.01
|
11.90
|
| Ultra
X-Connect |
3.25
|
4.99
|
11.91
|
| CM
RealPower |
3.29
|
5.03
|
11.97
|
All three PSUs did well in our tests, with the
RealPower being the most consistent throughout testing. The
ModStream was hit hardest on the +12v rail compared to the other
two, but was a bit stronger than the X-Connect in the +3.3v
and +5v tests.
While we never felt the PSU would make a big impact
on system and CPU cooling, the location of most PSU fans warrant
a quick check.
|
System
(°C)
|
CPU
(°C)
|
| OCZ
ModStream |
42
|
56
|
| Ultra
X-Connect |
44
|
58
|
| CM
RealPower |
42
|
56
|
The ModStream is on par with the RealPower which
isn't too surprising since their cooling setup is almost identical.
Despite the dual fans on the X-Connect, its cooling performance
lags behind the other two by a couple degrees.
Final
Words
Overall,
OCZ has done a fine job with the ModStream 520W PSU. While it
didn't lead the pack in performance, the results put it just behind
the best PSU we've tested this year, so there's no shame in finishing
second. Being a modular setup, installation was very easy, and
although the PowerShield EMI made for stiff cables, we did not
find them as difficult to work with as the X-Connect's.
There
are just a few minor issues we had with the ModStream. Although
the peak capacity is fairly high, we were a bit puzzled why OCZ
left out some of it's more advanced power management features
such as dual +12v rails and adjustment knobs that made us such
big fans of their PowerStream series. Also, while we think it
isn't necessary to make the PSU completely modular, we felt the
extra 4-pin connection for most new Intel boards could have been
an EZMod cable.
That
being said, the ModStream proved to be very reliable though since
we've only been using this for two weeks (about 12 hours a day
on average) it's impossible to gauge the long term reliability.
The 3 year warranty OCZ provides does ease our minds though, and
with the cooling and power performance, as well as its modular
capabilities, the ModStream is worth consideration if you're in
the market for a new PSU.
Pros:
Stylish design, reliable power, good quality EZMod cabling. Quiet
and efficient cooling.
Cons:
Not 100% modular, no dual +12v rails.
Bottom
Line: While we wouldn't call this our PSU of the year,
the ModStream is definitely on our short list. It has the aesthetics
and reliability that enthusiasts desire, and is backed by one
of the best warranties in the business which demonstrates OCZ's
confidence in their products.
Hit
us up in the Forums
if you have any questions.
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