Go Back   Hardware Canucks > HARDWARE > Power Supplies

    
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old March 14, 2009, 07:40 PM
Rookie
 
Join Date: Feb 2008
Location: Kelowna, BC.
Posts: 34
Default What kind of power supply do i need to run 4870 crossfire!

im building a new computer and i need power supply that will power 2 4870, three 500 gig hard drives, phenom II x4 940, 4 gb corrsair memmory and 3 to 5 fans!

I was hoping to keep my cost around $150 maybe a bit more if i really have too!

Last edited by supernode; March 14, 2009 at 07:46 PM.
Reply With Quote
  #2 (permalink)  
Old March 14, 2009, 07:42 PM
Exmortis's Avatar
Top Prospect
 
Join Date: Nov 2008
Location: Ottawa
Posts: 172
Default

You could get by with a 750w, but if you want some breathing room I recommend the 1000w OCZ EliteXstream. Its well priced, not modular but very cost efective and one slick unit. Reviewed here and on HardOCP.
__________________
Exmortis's System

Corsair 600T White
Asus RoG Maximus V Gene
Intel i7-2600K w/Corsair H100
16GB Gskill DDR3 2400MHz
AMD R9 290X
OCZ Revo 3 240GB
OCZ Vertex 3 240GB
WD Velocirapter 600GB
LG DVD burner
LG Bluray Burner
Windows 7x64 Prem
Asus VE24/VE27/VE24
Logitech Z-5450 5.1 speakers
Corsair AX850 Gold PSU
Corsair K90 Keyboard
Reply With Quote
  #3 (permalink)  
Old March 14, 2009, 07:53 PM
SugarJ's Avatar
Moderator
F@H
 
Join Date: Jan 2008
Location: Langley, BC
Posts: 6,085

My System Specs

Default

Agreed, a 750 should do it, but an 850 will for sure.

Corsair TX850W 850W CMPSU-850TX 12V 70A 24PIN AT Power Supply Active PFC 140M Fan Powersupply - DirectCanada

$139.
Reply With Quote
  #4 (permalink)  
Old March 14, 2009, 08:22 PM
Oversized Rooster's Avatar
Allstar
 
Join Date: Mar 2008
Location: Toronto, ON
Posts: 609

My System Specs

Default

I have run dual 4850 cards, 4 hard drives, a quad core Q9450 CPU OCed to 3.8GHz, sound card, lots of fans, etc on a 750W PCP&C Silencer successfully...
__________________
Main: Intel 2600K @ 4.8GHz | Gigabyte P67A-UD7-B3 | 16GB Corsair DDR3-2000 | 2 x 240GB Corsair Force 3 in RAID1 | 2 x 4TB Hitachi 7K4000 | 3 x 2TB WD Caviar Black | Antec 1200 | Seasonic XP-860 Platinum | 2GB GTX 670 | 2 x 27" Asus VE278Q | Asus Essence ST | Win7 Pro 64-bit
Reply With Quote
  #5 (permalink)  
Old March 14, 2009, 09:29 PM
geokilla's Avatar
Hall Of Fame
F@H
 
Join Date: Aug 2008
Location: Toronto
Posts: 3,625

My System Specs

Default

Anything that's a or better than a Corsair HX620.
__________________
Reply With Quote
  #6 (permalink)  
Old March 15, 2009, 01:35 AM
rjbarker's Avatar
Hall Of Fame
 
Join Date: Feb 2008
Location: Courtenay, B.C
Posts: 5,932

My System Specs

Default

Quote:
Agreed, a 750 should do it, but an 850 will for sure.
+1

Quote:
but if you want some breathing room I recommend the 1000w OCZ EliteXstream.
C'mon 1kw is what is recommended for 2 x GTX 280's.....he's got 4870's
__________________
Introducing me n my OCD to Watercooling, is like taking an Alcoholic to an "all you can drink" Beach Bar in Mexico

.
Reply With Quote
  #7 (permalink)  
Old March 15, 2009, 04:03 AM
Rookie
 
Join Date: Feb 2008
Location: Kelowna, BC.
Posts: 34
Default

thanks for all the answers i was thinking this power supply OCZ ModXStream Pro 700W ATX 20/24PIN SLI Ready Modular Cables 140MM Fan 80PLUS Power Supply or do you think i should go with the 750 watt
Reply With Quote
  #8 (permalink)  
Old March 15, 2009, 05:40 AM
magictorch's Avatar
Hall Of Fame
F@H
 
Join Date: Apr 2007
Location: Annapolis Valley, NS
Posts: 1,836
Default

Given the price of the Pc&P or Corsair 750watt PSU's I'd stick with one of those as it will leave some room for other things, plus they are rated at high amps on a single rail. I'm planning on using my Pc&P 750watt to run a 2x4870's and an oc'd i7 with dual watercooling loops, currently have a X3350 right now (no issues). You could always spend a little more if you like on the corsair 850watt.
__________________
White Night:: i7920 (4ghz), Rampage III extreme (A1), Mushkin XP 1600 (9,9,9,24),SLI480., white MM horizon.
CPU: Feser 220 int.|Apogee GTZ|S.Res.rev2| MCP655.

GPU: PA120.3|S.Res.rev2|2x EK FC blocks| MCP655.
Reply With Quote
  #9 (permalink)  
Old March 15, 2009, 08:09 AM
stoanee's Avatar
Hall Of Fame
F@H
 
Join Date: Jun 2007
Location: Lacombe Alberta
Posts: 3,251

My System Specs

Default

From Wikipedia
Quote:
It's important to match the capacity of a power supply to the power needs of the computer. The energy efficiency of power supplies drops significantly at low loads. Efficiency generally peaks at about 50-75% load. The curve varies from model to model (for examples of how this curve looks see the test reports of energy efficient models found on the 80 PLUS website). As a rule of thumb for standard power supplies it is usually appropriate to buy a supply such that the calculated typical consumption of your computer is about 60% of the rated capacity of the supply provided that the calculated maximum consumption of the computer does not exceed the rated capacity of the supply. Note that advice on overall power supply ratings often given by the manufacturer of single component, typically graphics cards, should be treated with great scepticism. These manufacturers wish to minimise support issues due to under rating the supply and are willing to advise you to overrate it to avoid this.
Also,
Quote:
There is a popular misconception that a greater power capacity (watt output capacity) is always better. Since supplies are self-certified, a manufacturer's claims may be double or more what is actually provided.[6][7] Although a too-large power supply will have an extra margin of safety as far as not over-loading, a larger unit is often less efficient at lower loads (under 20% of its total capability) and therefore will waste more electricity than a more appropriately sized unit. Additionally, computer power supplies generally do not function properly if they are too lightly loaded. Under no-load conditions they may shut down or malfunction
Here is linky to a calculator;
Thermaltake Power Supply Calculator
__________________
heatware
Reply With Quote
  #10 (permalink)  
Old March 15, 2009, 11:49 AM
Exmortis's Avatar
Top Prospect
 
Join Date: Nov 2008
Location: Ottawa
Posts: 172
Default

Nice post Stoanee, especially with regards to under loading a PSU. But in this case, my bet is he will have no such underloading issue. I only recommended the 1k because most people who go CF/SLI tend to always have new and power hungry gadgets to expand their computers, and with the extra breathing room, your covered.

Some nice PSUs suggested, always always though, check the PSU for a HWC, or HardOCP test, I won't buy one that isn't tesed by one of those two, both is even better.
__________________
Exmortis's System

Corsair 600T White
Asus RoG Maximus V Gene
Intel i7-2600K w/Corsair H100
16GB Gskill DDR3 2400MHz
AMD R9 290X
OCZ Revo 3 240GB
OCZ Vertex 3 240GB
WD Velocirapter 600GB
LG DVD burner
LG Bluray Burner
Windows 7x64 Prem
Asus VE24/VE27/VE24
Logitech Z-5450 5.1 speakers
Corsair AX850 Gold PSU
Corsair K90 Keyboard
Reply With Quote
Reply


Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
4870 Crossfire lanken123 Video Cards 3 February 27, 2009 08:57 PM
4870 crossfire MB? magictorch CPU's and Motherboards 16 August 7, 2008 08:50 AM