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Do I need more than a 750W

post #1 of 17
Thread Starter 
Hello Gents...and ladies?

I put my sig rig together back in November. All was working fine, that is until I decided to pick up another 470 from a newegg open box deal in Janurary.

With and without the SLI bridge attached, I was getting spontaneous freeze then restarts shortly after freezing, then BSOD's started to join the mix, iirc it was the "nvlddmkm.sys" type which Google searches suggests was driver related. At this time I had my CPU OC @ 4Ghz, which was an unstable clock anyway... After the issue failed to go away after fiddling with driver sweeper and older drivers, I decided to turn my attention to temperatures.

I really suspected heat first because my Board, Case, and the size of my PSU basically force these two cards to have no breathing room. Just wide enough to slide a folded piece of paper in between them. I have an Antec spot cool fan pointed at them so temps don't exceed beyond the 70's unless I run furmark.

Before I turn this into an essay, which I did, is the system overkill for my PSU?

I'm currently at stock speeds. Corsair's PSU Calculator suggests I should have at least a 850W. Yes? No?

Thanks. Oh, and I'm new
Edited by bizybone - 3/3/11 at 5:29pm
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Intel Core i7-950 Bloomfield 3.06GHz GIGABYTE GA-EX58-UD3R NVIDIA GeForce GTX 470 + MSI GeForce GTX 470 G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 
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Intel Core i7-950 Bloomfield 3.06GHz GIGABYTE GA-EX58-UD3R NVIDIA GeForce GTX 470 + MSI GeForce GTX 470 G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 
Hard DriveOptical DriveOSMonitor
80GB Intel SSD + 320GB Seagate 7200 + 2 x 1TB WD BD-RW Windows 7 64-bit Acer 24" + Samsung 24" 
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post #2 of 17
I would definitely upgrade to the 850 watt. I built my last I7 with a very similar setup that you have, also, using a Corsair 750 watt supply. It was fine with with a single GTX 470, but when I went to SLI it became unstable.

With the 850 or higher you will have a little room to overclock as well.
    
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post #3 of 17
Usually I'd tell people with GTX480's to go 850W, but I'm not sure if the 470's actually consume as much power as the 480's.

Does this issue happen at stock speeds?
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post #4 of 17
750W should be enough for 470 SLI in theory. Have you tried using only 1 card at a time in each PCIe slot?
post #5 of 17
Thread Starter 
Quote:
Originally Posted by MoCo Man View Post
I would definitely upgrade to the 850 watt. I built my last I7 with a very similar setup that you have, also, using a Corsair 750 watt supply. It was fine with with a single GTX 470, but when I went to SLI it became unstable.

With the 850 or higher you will have a little room to overclock as well.
Thanks
Quote:
Originally Posted by Volvo View Post
Usually I'd tell people with GTX480's to go 850W, but I'm not sure if the 470's actually consume as much power as the 480's.

Does this issue happen at stock speeds?
Sure does and only when both cards are installed.

Quote:
Originally Posted by Riou View Post
750W should be enough for 470 SLI in theory. Have you tried using only 1 card at a time in each PCIe slot?
I haven't but I did swap slots, I've been removing and reinstalling the MSI card every few weeks when I get tired of the freezing. I'll give that a shot.
My System
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CPUMotherboardGraphicsRAM
Intel Core i7-950 Bloomfield 3.06GHz GIGABYTE GA-EX58-UD3R NVIDIA GeForce GTX 470 + MSI GeForce GTX 470 G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 
Hard DriveOptical DriveOSMonitor
80GB Intel SSD + 320GB Seagate 7200 + 2 x 1TB WD BD-RW Windows 7 64-bit Acer 24" + Samsung 24" 
PowerCase
SeaSonic X750 Gold COOLER MASTER Storm Sniper 
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My System
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CPUMotherboardGraphicsRAM
Intel Core i7-950 Bloomfield 3.06GHz GIGABYTE GA-EX58-UD3R NVIDIA GeForce GTX 470 + MSI GeForce GTX 470 G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 
Hard DriveOptical DriveOSMonitor
80GB Intel SSD + 320GB Seagate 7200 + 2 x 1TB WD BD-RW Windows 7 64-bit Acer 24" + Samsung 24" 
PowerCase
SeaSonic X750 Gold COOLER MASTER Storm Sniper 
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post #6 of 17
Make sure you're running the latest drivers and BIOS revision. That PSU should be able to handle your system, especially at stock.

EDIT: Your temps don't seem high enough to cause a BSOD either.
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post #7 of 17
Corsair's Psu calculator is a marketing tool and nothing more. Your PSU is absolutely fine for 2 470's I would suspect another issue.
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post #8 of 17
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post #9 of 17
The 470 in SLI will draw around 550 watts add cpu and rest of system you are fine.
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post #10 of 17
Quote:
Originally Posted by killeraxemannic View Post
Corsair's Psu calculator is a marketing tool and nothing more. Your PSU is absolutely fine for 2 470's I would suspect another issue.
also there is the possibility that there is another issue with the PSU itself, and not just simple wattage. What is the amperage rating of the 12v? does it meet the standards of the cards?
    
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