Is 850w PSU enough power?

Jyynnxx

Honorable
Feb 19, 2012
9
0
10,510
Hi there everyone,

I have had this computer for about a year now, minus an SLi setup, until about 2 months ago, then I bought a second 680.

I was wondering if I ran SLi and had a 850w psu and games ran like shit, would it be because Im not drawing enough power needed to run my setup?

I know a little about computer and I only purchased this setup to learn more about them and overclocking and what not... but there are only so many things I know and games running slow or craptastic on this beast just pissed me off. So, here I am in the forums asking for some sort of insight in to my problem.

System specs are as follows:



Corsair HX Professional Series 850-Watt 80 Plus Certified Power Supply Compatible with Core i7 and Core i5 - CMPSU-850HX

MSI N680GTX Twin Frozr 2GD5/OC GeForce GTX 680 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Graphics Card x2

Western Digital WD1002FAEX Caviar Black 1 TB SATA III 7200 RPM 64 MB Cache Internal Desktop 3.5" Hard Drive

OCZ 120GB Vertex 3 SATA 6Gb/s 2.5-Inch Performance Solid State Drive (SSD) with Max 550MB/s Read and Max 4KB Write 85K IOPS- VTX3-25SAT3-120G

LG Electronics 14x Internal BDXL Blu-Ray Burner Rewriter WH14NS40 - Bulk Drive - Black

CM Storm Enforcer - Gaming Mid Tower Computer Case with USB 3.0 and Windowed Side Panel

Corsair CMT16GX3M4X2133C9 Dominator 16GB DDR3 2133 MHz (PC3-17066) Desktop Memory

Corsair Hydro Series Extreme Performance Liquid CPU Cooler H100i

ASUS Rampage IV Extreme LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 Extended ATX Intel Motherboard

Intel Core i7-3960X Extreme Edition Hexa-Core Processor 3.3 GHz 15 MB Cache LGA 2011 - BX80619I73960X
 
Solution
For a system using two GeForce GTX 680 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 750 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 53 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors or two 6-pin and two 8-pin PCI Express supplementary power connectors depending on brand and model of the graphics card.

Your problem doesn't seem to be insufficient power.

Put everything back to stock/factory clocks and start you troubleshooting from there.

DrBackwater

Honorable
Jun 10, 2013
362
0
10,810


I don't understand, are you asking a theory question or a actual question.

So you ran two sli'd 680's with 850 certified gold psu; or you enquiring that: is your psu capable underload overclocked or not to bare the brunt of 2 gtx 680's.

2 factors arise, the maximum watt-load can your psu handle from one 680.

and a combined total of 2 680's on 850 psu. 3-4 gtx gpu's sli'd would in theory need 1000+psu.
 

Jyynnxx

Honorable
Feb 19, 2012
9
0
10,510
I have everything over clocked on this system... cpu - 4.0ghz, both cards came over clocked, memory - 2133mhz. I was wondering since all the stuff is being over clocked if I still had enough power under load with a 850 psu. Thats all I wanted to know on the psu side of things. My games started to run glitchy or stuttery and I am trying to find the solution to this problem. It all started when I got the second video card a couple months ago.

 
For a system using two GeForce GTX 680 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 750 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 53 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors or two 6-pin and two 8-pin PCI Express supplementary power connectors depending on brand and model of the graphics card.

Your problem doesn't seem to be insufficient power.

Put everything back to stock/factory clocks and start you troubleshooting from there.
 
Solution