Go Back   AnandTech Forums > Hardware and Technology > Power Supplies

Forums
· Hardware and Technology
· CPUs and Overclocking
· Motherboards
· Video Cards and Graphics
· Memory and Storage
· Power Supplies
· Cases & Cooling
· SFF, Notebooks, Pre-Built/Barebones PCs
· Networking
· Peripherals
· General Hardware
· Highly Technical
· Computer Help
· Home Theater PCs
· Consumer Electronics
· Digital and Video Cameras
· Mobile Devices & Gadgets
· Audio/Video & Home Theater
· Software
· Software for Windows
· All Things Apple
· *nix Software
· Operating Systems
· Programming
· PC Gaming
· Console Gaming
· Distributed Computing
· Security
· Social
· Off Topic
· Politics and News
· Discussion Club
· Love and Relationships
· The Garage
· Health and Fitness
· Home and Garden
· Merchandise and Shopping
· For Sale/Trade
· Hot Deals with Free Stuff/Contests
· Black Friday 2014
· Forum Issues
· Technical Forum Issues
· Personal Forum Issues
· Suggestion Box
· Moderator Resources
· Moderator Discussions
   

Reply
 
Thread Tools
Old 11-15-2012, 10:52 PM   #1
icu222much
Junior Member
 
Join Date: Nov 2012
Posts: 18
Default Need PSU - i5-3570K, 7950 CF

I have selected my components, but am unsure how much power my system needs. I heard that it is very important to get a quality PSU as a cheaper one may damage your system. I plan to Crossfire my 7950s, and overclock my CPU and GPU to within safety temperatures. After doing some research on other builds similar to mine, I noticed that most people got PSUs around the 850w to 950w range. I wasn't sure if they also considered overclocking. In the future, I will also add on an additional one or two more 7200RPM hard drive.

I heard alot of good things about Corsair PSUs so I was thinking about getting a Corsair TX850. Would that provide enough power?

i5-3570k
CM Hyper 212 Evo
Gigabyte 7950 Crossfire
ASRock Z77 Extreme4
GSkill Ripjaw 2x8GB
WD Caviar Black 1TB
Crucial M4 128GB
Rosewill Thor V2
icu222much is offline   Reply With Quote
Old 11-15-2012, 11:23 PM   #2
crazymonkeyzero
Senior Member
 
crazymonkeyzero's Avatar
 
Join Date: Feb 2012
Posts: 363
Default

Hi and welcome to the forum.


To answer your question. Yes, 850W is more than enough to power your crossfire setup with comfortable headroom to spare, in fact, I believe can get by with a good quality 650w. Here's a nice site where you can check how much power you need for your setup, including overclocks.

http://extreme.outervision.com/psucalculatorlite.jsp

I'd probably stay in the 700w range to be "comfortable" with the overclock. Corsair does make some good psus, especially their HX and AX series which are also modular.

For the price of $100 this Rosewill Capstone 750 is currently a steal.

http://www.newegg.com/Product/Produc...82E16817182073

Here are some other good ones that will also fit the bill, but are a bit more pricey:
corsair hx 750
http://www.newegg.com/Product/Produc...82E16817139010

seasonic x750
http://www.newegg.com/Product/Produc...82E16817151087

Last edited by crazymonkeyzero; 11-15-2012 at 11:51 PM.
crazymonkeyzero is offline   Reply With Quote
Old 11-15-2012, 11:26 PM   #3
Eureka
Diamond Member
 
Eureka's Avatar
 
Join Date: Sep 2005
Posts: 3,826
Default

600-700W is a good range for 2 cards. 850W will give you a lot of headrooom with 2 cards, you might even be able to push 3 cards on it.
__________________
San Francisco: ASRock Z87E-ITX | Intel i7-4770k | 16 GB DDR3 1600 | Gigabyte WF3 7950
Honolulu: Gigabyte MA790X-UD4P | AMD Phenom II X4 955 | 8GB DDR2 800 | Sapphire HD4890
London: ASRock 4CoreDual-VSTA | Intel Dual Core E7400 @ 3.1ghz | 2GB DDR2 667 | ATi X850 XT @ 540/590
Eureka is offline   Reply With Quote
Old 11-15-2012, 11:29 PM   #4
icu222much
Junior Member
 
Join Date: Nov 2012
Posts: 18
Default

Are you sure? I don't mean to question you, but the Newegg PSU calculator says I need ~825W, and I'm not sure if they factored in OC-ing GPU/CPU.
icu222much is offline   Reply With Quote
Old 11-15-2012, 11:45 PM   #5
Eureka
Diamond Member
 
Eureka's Avatar
 
Join Date: Sep 2005
Posts: 3,826
Default

Those calculators are always high... 850 isn't bad, but you should be able to get by with 700W too.
__________________
San Francisco: ASRock Z87E-ITX | Intel i7-4770k | 16 GB DDR3 1600 | Gigabyte WF3 7950
Honolulu: Gigabyte MA790X-UD4P | AMD Phenom II X4 955 | 8GB DDR2 800 | Sapphire HD4890
London: ASRock 4CoreDual-VSTA | Intel Dual Core E7400 @ 3.1ghz | 2GB DDR2 667 | ATi X850 XT @ 540/590
Eureka is offline   Reply With Quote
Old 11-15-2012, 11:47 PM   #6
icu222much
Junior Member
 
Join Date: Nov 2012
Posts: 18
Default

What happens if I don't have enough power? Will my cards just fail?
icu222much is offline   Reply With Quote
Old 11-16-2012, 12:01 AM   #7
crazymonkeyzero
Senior Member
 
crazymonkeyzero's Avatar
 
Join Date: Feb 2012
Posts: 363
Default

Quote:
Originally Posted by icu222much View Post
What happens if I don't have enough power? Will my cards just fail?
Game play will studder or crash when you put load on the overclocked cards. Lol, newegg calculator is calibrated to get you to buy a more powerful psu than you need. After all, they are going to be pocketing the difference.



But seriously 700w+ is perfectly fine. Just make sure it has a single 12v rail in the specs.
crazymonkeyzero is offline   Reply With Quote
Old 11-16-2012, 12:04 AM   #8
fffblackmage
Platinum Member
 
fffblackmage's Avatar
 
Join Date: Dec 2007
Posts: 2,541
Default

I was looking up power consumption for 7950 CFX and came across this: http://www.guru3d.com/articles_pages...d_3_way,5.html
Quote:
What would happen if your PSU can't cope with the load:

bad 3D performance
crashing games
spontaneous reset or imminent shutdown of the PC
freezing during gameplay
PSU overload can cause it to break down
Those calculators say you need ~800W of power because there are craptastic power supplies out there that are overrated. An excellent 650W PSU would power your computer just fine and provide you with cleaner power (less voltage ripples, better voltage regulation, and you get stuff like over-current protection and over-voltage protection) than any crappy 800W PSU.

And single vs multiple rails doesn't matter.

Actually, most of the stickies on top of the Power Supply subforum are excellent reads on PSUs in general.

Last edited by fffblackmage; 11-16-2012 at 12:25 AM.
fffblackmage is online now   Reply With Quote
Old 11-16-2012, 03:23 AM   #9
lehtv
Diamond Member
 
lehtv's Avatar
 
Join Date: Dec 2010
Posts: 9,998
Default

XFX 750W XXX edition $100
80+ silver
semi-modular
5-yr warranty
made by seasonic

Rosewill Capstone 750W $100
80+ gold
non-modular
5-yr warranty
made by superflower
__________________
System specs
lehtv is offline   Reply With Quote
Old 11-16-2012, 05:31 AM   #10
BFG10K
Lifer
 
BFG10K's Avatar
 
Join Date: Aug 2000
Posts: 20,514
Default

As has been stated, 850W is absolutely overkill for that setup if itís a quality PSU (i.e. one guaranteed to deliver its full rated power).
__________________
4790K | Titan | 16GB DDR3-1600 | Z97-K | 128GB Samsung 830 | 960GB Crucial M500 | 1TB VelociRaptor | X-Fi XtremeMusic | Seasonic X 560W | Fractal Arc R2 Midi | 30" HP LP3065
BFG10K is offline   Reply With Quote
Old 11-16-2012, 04:08 PM   #11
dmoney1980
Platinum Member
 
Join Date: Jan 2008
Location: Chicago
Posts: 2,100
Default

Quote:
Originally Posted by lehtv View Post
XFX 750W XXX edition $100
80+ silver
semi-modular
5-yr warranty
made by seasonic

Rosewill Capstone 750W $100
80+ gold
non-modular
5-yr warranty
made by superflower
can't beat that with a stick!
dmoney1980 is offline   Reply With Quote
Old 11-16-2012, 04:17 PM   #12
badboyeee
Senior Member
 
Join Date: Nov 2001
Location: cali
Posts: 664
Default

Antec High Current Gamer Series HCG-750 750W ATX12V v2.3 / EPS12V v2.91 SLI Certified CrossFire Certified 80 PLUS BRONZE Certified Active PFC Power Supply

$55 AR @ Newegg:
http://www.newegg.com/Product/Produc...82E16817371049
badboyeee is offline   Reply With Quote
Old 11-16-2012, 04:48 PM   #13
lehtv
Diamond Member
 
lehtv's Avatar
 
Join Date: Dec 2010
Posts: 9,998
Default

Where'd you put that stick, dmoney... .

And that's one of the Antecs with 5 year warranty no less. OP - grab it now.
__________________
System specs
lehtv is offline   Reply With Quote
Old 11-16-2012, 08:09 PM   #14
kleinkinstein
Banned
 
Join Date: Aug 2012
Location: Closet
Posts: 823
Default

Seasonic X650 @ $90 or X750 @ $100 on CM. Few, if any, compares!
kleinkinstein is offline   Reply With Quote
Old 11-16-2012, 08:46 PM   #15
TemjinGold
Platinum Member
 
Join Date: Dec 2006
Posts: 2,467
Default

At nearly half the price, the Antec certainly compares.
__________________
Antec P182 | Seasonic X-660 | Cyberpower 1000PFCLCD |
Intel i5 2500k @4.2 w/ Corsair H55 | ASUS Maximus IV Gene-Z |
16gb G.SKILL DDR3 1600 | ASUS GTX580 |
Sharp AQUOS LC-32LE700UN 32" LED HDTV | 1x 960 gb Crucial M500 |
1x 1TB Samsung F3 | Samsung SATA DVD Burner | Logitech Z-5500
TemjinGold is offline   Reply With Quote
Old 11-17-2012, 01:35 PM   #16
kleinkinstein
Banned
 
Join Date: Aug 2012
Location: Closet
Posts: 823
Default

Huh? How? I guess the silver lining is that you indeed don't pay for what you don't get in that Antec

4 rails? Oh my!
No Gold
No Modular
No Sanyo Denki San Ace PWM Silent Fan
No silent operation up to 45% load
7.1" long
Lot's of dead units after 12-18
Ho-hum and lackluster reviews
No wonder it's on discount. Antec must be trying to purge the shelves.

X750 wins
kleinkinstein is offline   Reply With Quote
Old 11-17-2012, 02:48 PM   #17
aaksheytalwar
Diamond Member
 
Join Date: Feb 2012
Posts: 3,137
Default

I would get a seasonic x850 or x1000
__________________
3770k @ 4.3 with H100i, Asus Z77 Deluxe, Samsung 30nm 4x4gb ddr3 @ 1866 9-9-9-28 1T, MSI R9 290 Gaming 4G, Coolermaster Silent Pro Hybrid 1300 watts, Crucial M4 512gb, 3x Seagate 7200.14 3TB each
aaksheytalwar is offline   Reply With Quote
Old 11-17-2012, 03:09 PM   #18
lehtv
Diamond Member
 
lehtv's Avatar
 
Join Date: Dec 2010
Posts: 9,998
Default

Quote:
Originally Posted by aaksheytalwar View Post
I would get a seasonic x850 or x1000
It's for 7950 crossfire, not trifire.
__________________
System specs
lehtv is offline   Reply With Quote
Old 11-17-2012, 07:09 PM   #19
TemjinGold
Platinum Member
 
Join Date: Dec 2006
Posts: 2,467
Default

Quote:
Originally Posted by aaksheytalwar View Post
I would get a seasonic x850 or x1000
Nono, play it safe man. Go with the EVGA NEX1500 for headroom!
__________________
Antec P182 | Seasonic X-660 | Cyberpower 1000PFCLCD |
Intel i5 2500k @4.2 w/ Corsair H55 | ASUS Maximus IV Gene-Z |
16gb G.SKILL DDR3 1600 | ASUS GTX580 |
Sharp AQUOS LC-32LE700UN 32" LED HDTV | 1x 960 gb Crucial M500 |
1x 1TB Samsung F3 | Samsung SATA DVD Burner | Logitech Z-5500
TemjinGold is offline   Reply With Quote
Old 11-18-2012, 10:50 AM   #20
aaksheytalwar
Diamond Member
 
Join Date: Feb 2012
Posts: 3,137
Default

If you want to overclock really high, or at least keep the option open (coupled with 6+ hdds if needed) then 850 watts will be borderline. Just a single 7950 past 1200 with volt mod can use up to 250-300 watts at peak.
__________________
3770k @ 4.3 with H100i, Asus Z77 Deluxe, Samsung 30nm 4x4gb ddr3 @ 1866 9-9-9-28 1T, MSI R9 290 Gaming 4G, Coolermaster Silent Pro Hybrid 1300 watts, Crucial M4 512gb, 3x Seagate 7200.14 3TB each
aaksheytalwar is offline   Reply With Quote
Old 11-18-2012, 02:48 PM   #21
badboyeee
Senior Member
 
Join Date: Nov 2001
Location: cali
Posts: 664
Default

So whatcha getting OP?! Get Gold if only you game hours everyday or leave computer on 24/7. If you look at the other newegg reviews they all have their share of DOA units, even the seasonics.
badboyeee is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 11:25 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.