Serville Posted May 18, 2014 Share Posted May 18, 2014 Just bought CS750M last week, and frankly I feel a little disappointed with the +12v regulation. My system is currently only using 240W under full CPU load according to my Wattmeter, and the +12v intermittently fall to +11.7v. I know it's still within acceptable tolerance for stability, but to be honest I've never had any of my PSUs that shows such a drastic drop to the +12v, even from a no-name brand, esp at this capacity. The PSU it replaced is a 500 watter without 80+/bronze/silver/gold or whatever certifications, but it still maintains a stable +11.90v under full CPU Load. I made a complaint to Corsair distributor here in my country, and he explained that it's still within specs. Yup, I couldn't blame him because it is, and I don't have stability problem either, so I was quite speechless. It's just difficult for me to accept the fact that out of so many PSUs I've been using all these years , from no-name to branded ones, I've never seen my +12v dropped so much. Since it's a 750w capacity, and I'm only using 240w, I feel quite a shock really. What happens if I draw near capacity ? One hardware site made a review of CS650M, and he also experienced the same drop in the +12v rail. I wonder whether this is common to this CS series? Lack of quality control ? Initially I was looking to buy CX750M, and it was out of stock. I was suggested to buy CS750M instead because it has better certification than the CX series and I was sold. It's my first Corsair PSU, and to be honest, I'm not happy. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 19, 2014 Corsair Employees Share Posted May 19, 2014 My system is currently only using 240W under full CPU load according to my Wattmeter, and the +12v intermittently fall to +11.7v. What's a Wattmeter? Is that a DMM that you have plugged into an available Molex or some piece of software? Link to comment Share on other sites More sharing options...
Serville Posted May 19, 2014 Author Share Posted May 19, 2014 I mean watt meter (or kill-a-watt), to measure how many watts an electrical device actually consumes/draw from the wall. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 19, 2014 Corsair Employees Share Posted May 19, 2014 How is that measuring the +12V? A Kill-A-Watt measures the AC from the wall. Not DC at the power connector. How are you measuring that the +12V is dropping? Link to comment Share on other sites More sharing options...
Serville Posted May 19, 2014 Author Share Posted May 19, 2014 I never said I used a Watt meter to measure the +12v rail. It measures the power consumption of my PC , which is about 240W. I can see the +12v dropping from the Toverclocker utility from Biostar which monitors the processor vcore, and all the voltage rails. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 19, 2014 Corsair Employees Share Posted May 19, 2014 I never said I used a Watt meter to measure the +12v rail. It measures the power consumption of my PC , which is about 240W. I can see the +12v dropping from the Toverclocker utility from Biostar which monitors the processor vcore, and all the voltage rails. A ha... That's what I thought. You never said you were using the Watt meter to measure +12V, but you never said what you WERE using to monitor your +12V. ;): Your voltages aren't dropping that much. Software and BIOS reading are notoriously inaccurate. Think about where it's getting that reading from? Not directly from the PSU, but through traces in your motherboard that eventually ends up at an IC that can do the monitoring with a +/- tolerance of about 5%. Seriously... Google it. Everyone will tell you not to judge your PSU voltages by software or BIOS readings. Some links: http://hardforum.com/showthread.php?t=1702359 http://www.overclock.net/t/682299/speedfan-wrong-reading http://forums.anandtech.com/showthread.php?t=2168466 http://www.overclockers.com/forums/showthread.php?t=713892 If you really want to know if your +12V is really dropping, the only way to find out is to use a DMM and measure it on an available connector. Link to comment Share on other sites More sharing options...
chewbrocca Posted October 15, 2015 Share Posted October 15, 2015 I just want to add that I just picked up a new cs750m and after a lot of aggravation trying to get it to work I have determined that its the PSU. On the off chance I checked the 12v rail for PCIe and saw that it was below 12v and it is not powering up my video card. I just wanted to add my $0.02. 12V rails matter and as this is my first delving into Corsair power supplies its not really a confidence builder. This is my experience and just wanted to share it with others. Thanks Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted October 15, 2015 Corsair Employees Share Posted October 15, 2015 How did you check the voltage and how far below +12V was it? Also, it IS a shame that your first Corsair PSU experience is with Corsair's cheapest line. While actual failure rates are quite low, the CX is made for price point more than meeting actual performance metrics. Link to comment Share on other sites More sharing options...
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