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Rosewill RP650-2 650 Watt Power Supply

By: David Walker | Other PSUs in Cases, Cooling & PSU | Posted: Feb 17, 2009 5:00 am
TweakTown Rating: 78%Manufacturer: Rosewill

Test Results


Our load tests leverage a couple of FAST ATE active load testers and a variety of other equipment such as a hotbox, oscilloscope, power conditioner, temperature probe, and a power consumption meter. You can read more about our standard testing approach here.


Our first five tests represent incrementing classes of modern gaming systems with the last test catered to the full spec of the power supply at up to about 1 kW. We measure voltage output at each load, ripple and efficiency. Now, for the Rosewill RP650-2 results:


Rosewill RP650-2 650 Watt Power Supply


Rosewill RP650-2 650 Watt Power Supply


The Rosewill RP650-2 performed decently during load tests that it will likely encounter as a value oriented product. The 3.3V output did drop off a little too much on test 5 and fell below the minimum ATX specification of 3.14V. Test 5 was well within defined load capacity and should not have posed an issue for the power supply, so the result was disappointing.


The biggest failure, however, was Test 6 at full load during both the ambient and hotbox tests. The power supply was fully loaded up to the claimed specification on the label and it failed on both accounts. It did not power up in the hotbox at all and ran for only a few minutes at ambient temperature. This makes me suspect that the marketing department simply wanted this to be a 650 Watt power supply and stretched the power ratings a little.


The power supply may have run perfectly at the 611.5 Watts the reference power supply was designed to handle instead of the claimed 631.5 Watts from Rosewill, but we will never know. We run all of our test samples at the manufacturer claimed specification and if the power supply fails because the numbers were exaggerated, then we simply note the failure.


In the end, it appears there is a difference between the Rosewill and the likes of Corsair, Silverstone and PC Power and Cooling, after all. Premium brands are traditionally conservative in their power delivery ratings which help them deliver better load results than their value oriented compatriots. Pushing the claimed power specification beyond what the unit was designed for in order to get the rating up to a nice round number may have failed this power supply. Sometimes, wanting a bigger number on the box is just not a good idea.


So, what about efficiency? - Well, the Rosewill RP650-2 is not 80 Plus certified, but the reference power supply the Rosewill is based on is certified. I am not sure why Rosewill chose to stretch the claimed power output to 650 Watts and forego the 80 Plus claim. Efficiency results in all completed load tests do indicate that the power supply is more than capable in this area.


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