how-to block ads
|
ninjatutle
join:2006-01-02
San Ramon, CA | reply to ninjatutle
Re: What happens if your PSU is too weak for the video card?
I have an 8800GT, minimum requirements are:
400W with 26A output.
Currently mine is 305W and 18A.
Would (3) +12V Rails be better or 1 +12v at a higher rate?
+12V1@18A,+12V2@18A,+12V3@18A
or
+12V@49A | |
The Flash
You don't win friends with salad
Premium
join:2002-10-17
Toronto, ON | I wouldn't even plug that PSU in your computer.
Get a PSU with a large 12V rail, Corsair has great PSUs. | |
ninjatutle
join:2006-01-02
San Ramon, CA
 ·AT&T U-Verse
 ·AT&T Yahoo
 ·Sprint Mobile Broa..
| Is it overkill to go with the larger rail ones? I'm not running SLI and not overclocking.
These are the 4 I'm looking at. They range from $70-$120 shipped. I'll be ordering something today. I'll spend $120 if I have to, but I would rather spend $70.
1. Corsair CMPSU-450VX 450W +12V@33A
2. Corsair CMPSU-550VX 550W +12V@41A
3. Corsair CMPSU-650TX 650W +12V@52A
4. PC Power & Cooling S610EPS
610W Continuous @ 40°C +12V@49A
• 450VX
»www.newegg.com/Product/Product.a···SU-450VX
• 550VX
»www.newegg.com/Product/Product.a···17139004
• 650TX
»www.newegg.com/Product/Product.a···17139005
• PC Power & Cooling S610EP
»www.newegg.com/Product/Product.a···17703005 | |
jouno53
McCain Palin 08
join:2006-03-04
United State
·AT&T DSL Service
| reply to ninjatutle
said by ninjatutle  :I have an 8800GT, minimum requirements are: 400W with 26A output. Currently mine is 305W and 18A. Would (3) +12V Rails be better or 1 +12v at a higher rate? +12V1@18A,+12V2@18A,+12V3@18A or +12V@49A Most modern supplies have multiple +12V rails. Since you have 3, and it requires 26A, all three of your 18A rails are more than enough. | |
The Flash
You don't win friends with salad
Premium
join:2002-10-17
Toronto, ON
·TekSavvy Solutions..
·Execulink
| said by jouno53 :said by ninjatutle :I have an 8800GT, minimum requirements are: 400W with 26A output. Currently mine is 305W and 18A. Would (3) +12V Rails be better or 1 +12v at a higher rate? +12V1@18A,+12V2@18A,+12V3@18A or +12V@49A Most modern supplies have multiple +12V rails. Since you have 3, and it requires 26A, all three of your 18A rails are more than enough. From what I understand, one big rail is better than several rails.
Once one rail is in use, it can't be used for anything else. But for one big rail it can be split between multiple devices. | |
eX_NihiLo
Here's Your Something For Nothing
Premium
join:2003-08-05
Louisville, CO
 ·Comcast
| The confusion on multiple vs single rail PSUs can be ended here. »www.jonnyguru.com/forums/showthr···p?t=3990. In summary a multple vs single rail is the Nth thing you should consider on selecting a PSU. | |
signmeuptoo
McCain is a gambling addict FACT
Premium
join:2001-11-22
Tardis in TN
clubs: 
·EarthLink
·Earthlink Cable Mo..
 ·Packet8
·AT&T Southeast
| reply to The Flash
To The Flash: That is something that comes from FUD that PC Power and Cooling published online. One single 12VDC rail is NOT necessarily ANY better, and CAN be WORSE. Why?
Here:
Most power supplies with multiple 12VDC rails only have so called "rails" from the fact that a single 12VDC rail is split up with a number of separated over current protection sub circuits. It *IS GOOD*, generally, to HAVE over current protection. Why? Because any given wire and/or connector can handle only so much current before it melts and burns and even catches fire. Also, other damage can occur to the rest of the system from a great an out of control load or short circuit. By setting a 12VDC rail into sub circuits simply with individual over current protection, you add a safeguard to things.
Now:
Some supplies DO HAVE "real" multiple 12VDC rails, such as Corsair's brand new HX-1000, which has TWO discrete 12VDC rails, but with over current set at, according to official statement, 40 amperes each. It is an awesome power supply.
However, IMHO, the ideal would be to have each so called rail be 22 amperes over current set, and to have the rails balanced as far as load. Here is an example:
Let's say the total possible output of the total 12VDC of a supply is 800W. The total maximum amount of available current support would then be about 66.7 amperes. Break that down by dividing by 4 rails and you have 16.67 amperes per rail if they all loaded down exactly the same. *HOWEVER*, since loading is NEVER balanced on a given system, each rail has its overcurrent set at 18 or even 20 amperes. So that means 4 rails of which each is over current set at 20 amps, but they all can't go to that amount totaled.
This is how supplies are done, with the overcurrent set high enough to take into consideration that no one's system loads down each rail equally.
Now:
On top of this, PCP&C still insists passing around even MORE marketing FUD: Their company boss, even recently, decried the use of modular connections on consumer power supplies. He insists that it increases the possibility for failures, a significantly reduced voltage/increased resistance, and even burn out danger. Bull crap I say. Real world tests done by pros have found that there is only a voltage drop of well less than .3%, on, say, a 12V run: That would mean 11.997 Volts DC. Big freaking deal. Sure, as load increases, that increases some, but no matter. Besides, they DESIGN the supplies to OUTPUT a regulated voltage based upon readings after the connectors, so voltages are made for it.
Officially, a supply is within spec if it is withing +/- 5%, or 11.4 - 12.6, and few supplies ever come close to being within 1% of baseline anyways, or within 11.88 - 12.12 throughout their full loaded range, though some are.
So FUD on both arguments by PCP&C. Sure, they make good power supplies (even if some models have Teapo capacitors and only a 40 degrees C temp rating for full load), but they put out pure B.S. that misinforms the public. Keep in mind that this is the same company that refuses to use 120mm - 140mm fans on the underside of the supply, insisting that only 80mm end fans work acceptably, even though it isn't true. I'd rather have a supply with modular and safe rails and a quiet 135mm fan that is still rated for 50 degrees C than what they sell. Don't get me wrong, I'm not saying they make bad product, they DO make very good supplies (well, their OEMs make them, but I digress...) What I am saying is, don't listen to FUD.
--
You know your life has gotten "DICEY" when it turns into an episode of LOST, like my ex wife, who I swear is one of "The Others". Cancer and other diseases kill fellow members here at DSLR! Easy: Join us in Teams Helix and Discovery to save the world! | |
|
