Antec Signature 650W Power Supply
by Christoph Katzer on October 1, 2008 4:00 AM EST- Posted in
- Cases/Cooling/PSUs
Efficiency and PFC
Many people focus primarily on power supply efficiency when it comes to making a decision between the various offerings. High efficiency can save money in the long run, but you want to make sure that the highest efficiency matches the sort of load you will be running. Ideally, you also want the efficiency curve to stay near its maximum value for a large portion of the graphs; in particular, we like to see a steep slope at the start of the charts, indicating efficiency ramps up quickly even at lower loads.
Looking at the results for the Antec Signature 650W, a load of 100W only provides around 76-77% efficiency, which is really low for a modern power supply. If you are considering this particular power supply, your system should have a constant power draw of at least 150W and preferably 200W or more power to achieve maximum efficiency. The maximum efficiency of 87% with 230VAC is very good, as is the 85% efficiency with 120VAC. You'll probably want to avoid putting a load of over 500W on the power supply, however, as efficiency begins to drop at that point.
With lower input voltages, the power factor correction is very good. Even with the higher 230VAC input, PFC is still acceptable.
Facebook
Twitter
RSS
21 Comments
View All Comments
HOOfan 1 - Thursday, October 2, 2008 - link
There is really no comparison at all, other than they are both Antec, both made by Delta, and both rated at 650W. Beyond that not much to compare, the Signature is a server grade PSU, the Earthwatts is a very decent value line PSU.1) The Signature is Modular (that costs money right there)
2) The Signature has all fully sleeved cables (costs money)
3) The Signature has a PWM controlled fan (costs money)
4) The Signature's Voltage regulation is within 1% while the EA650 is only as good as 3%
5) The Signature is as much as 3%-4% more efficient than the EA650
6) Kris thought the ripple suppression was unimpressive for the Signature (really that is pretty weird) well the EA650 has 70mV ripple on the 12V rails as opposed to less than 9mV on the Signature
7) Last but certainly not least the Signature is good for 94W more power on the 12V rails than the EA650.
The EA650 is for people who want a decent quality unit for a great price, the Signature 650W is for people who want a rock solid, stable PSU and don't care how much they pay for it.
bob4432 - Thursday, October 2, 2008 - link
where did you find this info? i have been looking for a ea650 review for over a month now and never came up w/ anything...do you have a link to a full review?HOOfan 1 - Friday, October 3, 2008 - link
well I am not sure how much anandtech would appreciate me linking to another review, but their sister site Dailytech does it all the time, so here you gohttp://www.jonnyguru.com/modules.php?name=NDReview...">Oklahoma Wolf's review of the EA650 at jonnyguru.com
bob4432 - Friday, October 3, 2008 - link
thanks for the link. i had even asked on jonnyguru's site in the past for a review, so now i get to read it :)dwvcore - Wednesday, October 1, 2008 - link
Antec makes some nice power supplies (I have used them many a times before), but they are not competitive with their prices at all ! Their Basiq and Earthwatts Series are O.K., but as soon as you step up to their signature or neo-watt series it skyrockets. An Antec 650 Signature costs $200, while you can get a 650w Corsair PSU for about $110 (newegg).JEDIYoda - Thursday, October 2, 2008 - link
Well if monmey is a factor then get the Corsair.The Antec Signature Series is supposedly the new standard by which all others are tested! -- according some knowledgeable reviewers
MamiyaOtaru - Wednesday, October 1, 2008 - link
No way in heck I am using anything smaller than a 120mm fan in my computers. Yes, that includes on the GPU, and yes that means I don't use the stock coolers. But I'm sure as heck not going for a PSU with a smaller fan. There aren't a lot of aftermarket PSU coolers out there that would let me replace the fan with a larger one.Goty - Wednesday, October 1, 2008 - link
I don't understand the stigma about smaller fans in PSUs. If the unit is designed well, you can use a smaller fan and get noise and cooling levels equal to that of a unit that uses a larger fan.erple2 - Wednesday, October 1, 2008 - link
I agree. What's the problem with a smaller fan? I think the problem is people are taking "rules of thumb" and applying them improperly. My computer chews through ~300W of power at peak loads (8800GTX, E6750, measured via my admittedly probably inaccurate UPS), and my (wasted extra) 750W power supply (PCP&C 750W Silencer) is essentially silent the whole time, with an 80mm fan. In fact, given my case design (PSU on the bottom), one of the 120mm fans would be worse for airflow than the 80mm fan I have now.I think the problem is people don't understand just how much power their computers require, and thus what loading their PSU's operate under. That dictates how much "noise" their 80mm vs. 120mm fans will generate.
SilthDraeth - Wednesday, October 1, 2008 - link
The height of a PSU isn't really able to house a 120mm fan. They can have them along the bottom, and leave the back vented, or put an 80 in the back. I don't really see what the problem is.