PC Power & Cooling Silencer 750w CrossFire Edition ATX PSU
Published: 28th August 2007 | Source: PC Power & Cooling | Price: £130 |Load & Efficiency Tests
To provide our readers with the most accurate results, Overclock3D uses a custom built PSU load tester on all reviews. This not only gives much more reliable results than the testing methods employed by other sites, but also allows for all current and future review results to be compared side-by-side.
Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains (Mains Draw) against the power consumed by the OC3D power supply stress tester (PSU Load). These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment.
| +3.3v Rail||0w||33w||66w|
| +5.0v Rail||0w||50w|| 100w|
| +12v Rail||0w||360w||600w|
In our continuing efforts to make power supply reviews more thorough, rather than simply checking voltage stability, Overclock3D will now be recording the temerature of each PSU as it undergoes testing. Temperature recordings will be taken from the underside of the PSU's outer casing at 0%, 50% and 100% load levels using a laser infrared thermometer in an attempt to gauge how much heat is likely to radiate into the end-users case.
Noise Level Recordings
Possibly the hardest part of any PSU review is summarising the level of noise given out by the unit. The threshold for what is considered 'noisy' varies from person to person and therefore what I may consider a quiet unit, another person may consider extremely loud. A common way to resolve this issue is to use a dBA meter to measure the units noise level, however this doesn't take into account the pitch (type) of noise emitted and whether it is likely to irritate end users.
For this reason OC3D records all power supplies at idle and load in wav format for you to make your own informed decisions. All recordings are taken at 30cm away from the PSU and outside of a PC case. You will need to remember that noise levels will be reduced by varying amounts once the PSU has been installed inside your PC enclosure.
0% Load Recording - Download
50% Load Recording - Download
100% Load Recording - Download
As you will be able to hear from the recordings above, the S75CF managed to remain extremely silent at both 0% and 50% load levels despite the use of an 80mm fan. In fact, I have no doubts that installing the S75CF inside an average PC would see the noise from the unit drowned out by normal case, motherboard and GPU fans.
Increasing the load to 100% saw the fan speed elevate significantly, causing a rise in the noise levels emitted from the unit. In all fairness it would be extremely difficult for the average PC enthusiast to put this much load on the PSU, but at this load level the S75CF wouldn't be suitable for 'Silent PC' enthusiasts or those building a HTPC.