Cold Test Results

For the testing of PSUs, we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M  40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs - 2014 Pipeline post.

Efficiency

Power Losses

The 850W, 1000W and 1200W versions of the Quark do honor their 80Plus Platinum certification with ease, with the 850W showing a little higher overall efficiency than the other two models. The 850W version has an average efficiency of 93% within the nominal load range (20% to 100% of the unit's capacity), while the 1000W and 1200W versions both have an average efficiency of 92.6%. The largest differences occur when the units are heavily loaded, with the 850W version being more stable than the more powerful variations. On the other hand, the 750W version is the least efficient when heavily loaded, with the efficiency dropping down to 90.2% at full load. Still, the average efficiency of the 750W is high, with an average of 92.5% within the nominal load range.

Intake & Exhaust Air Temperature

Heatsink Temperature

In room temperature, all four of the Quark PSUs displayed the exact same thermal and acoustics behavior. The internal temperatures of every PSU increase very smoothly, almost linearly, with their magnitude being about the same for every unit at a specific load. Ultimately, the more powerful units appear to be warmer just because their maximum output is higher.

In terms of acoustics, the behavior of the cooling system appears to be an exact copy between all of the PSUs, tying the fan's speed only to the relative load of the unit as long as the temperature is low enough. The Quark PSUs are dead silent when lightly loaded, with their fans essentially speeding up after the load has surpassed 60% of the unit's capacity. Even when loaded to the maximum, the SPL is below 36 dB(A), which corresponds to a very soft humming noise.

Sound Pressure Level
The Rosewill Quark Series PSUs Hot Test Results
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  • Mushkins - Wednesday, January 13, 2016 - link

    I was super excited for a Rosewill product with this kind of quality thats *fully modular*, right up until I saw the price point. A Corsair CX750M is about $85 and frequently goes on sale for less or includes $10-15 rebates. Granted it's only 80+ Bronze rated, but the practical differences between a Bronze and a Platinum unit are very small, if not totally meaningless for most people, and certainly isn't worth a $45+ price premium.

    Honestly, I think Rosewill missed the mark with these pushing for that Platinum rating.
    Reply
  • xthetenth - Wednesday, January 13, 2016 - link

    They're part of a line, and while the cheap high end is a somewhat limited market, they've got the lower end parts covered, and up until the top if they hit their pricing targets they'll be selling their platinums against other companies' golds and so on down the chain. Reply
  • bigboxes - Wednesday, January 13, 2016 - link

    You need to compare these PSUs (pricewise) to other platinum power supplies. If that is out of your budget you can always buy a bronze rated Rosewill if so inclined. Reply
  • zero2dash - Wednesday, January 13, 2016 - link

    You're comparing a budget model PSU to a non-budget model PSU. Do you also compare Chevy to Porsche? McDonald's dollar menu to Five Guys?

    You should instead be comparing this PSU to Corsair HXi and AXi if you want apples to apples.
    Reply
  • wolfemane - Wednesday, January 13, 2016 - link

    Yes Chevy has been compared to porche for a long time. Corvette and camero come to mind. Price per horse power has put the corvette ahead of more expensive porches. And at those costs, built quality in both are as good as porche but with far lower maintanen costs (and fewer trips to the shop).

    I think the original comment still stands. On paper these drives have some differences, but in real world application the cheaper psu operates at near or same performance as the premium psu.

    So one can brag about owning a porche, but next to a stingray their gonna be smoked and left realizing the only bonus to their more expensive hardware is image. As for me, I'll happily save money and make a porche driver frown.
    Reply
  • tuxRoller - Wednesday, January 13, 2016 - link

    You're right. A stingray would be left smoking on the railing if it tried to stay with a Porsche on a twisty track. Reply
  • devione - Thursday, January 14, 2016 - link

    Really? The ZR1 is only 1+ second slower than a 911 GT2. Reply
  • devione - Thursday, January 14, 2016 - link

    On the Nurburgring that is. Reply
  • catzambia - Monday, January 25, 2016 - link

    I've run Nordschliefe in 5 minutes in my civic Reply
  • wolfemane - Thursday, January 14, 2016 - link

    ZR1 - $70k
    911 GT2 - $120k

    ZR1 (hell even the Z06) has a better 0-60 and 0-100, same times around test tracks, better insurance rating, better maintenance time lines (and a whole lot cheaper), and gets better gas milage.

    The ZR1 is faster, quicker, and can corner better than any Porsche at the same price point. It might take Americans a lot longer to figure out how to make a true sports car out of an aging muscle car, but the Corvette is there.

    Let me also point out the new style Corvettes (99 and newer) have won 6 LeMans in the past 12 years. That track has corners, and Porsche does compete int he same class. That's a pretty good track record, and one that hasn't been broken yet.
    Reply

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