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Adding second GTX 670 FTW SLI, 650W PSU enough?

jmohamed

Okay good.

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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since putting the second card in the system has become increasingly unstable. This is similar to what happend when I was running a 420W temporarily when I had the single GTX 670 and a 3570K. But the upgrade from 3570K-3770K and the overclock and the second GTX 670 FTW seem to have pushed the 650 over the edge. EIther that or the problem is related to something else. 

 

Well, if you overclock first and then add a single card, that may be the problem. A 650w should have been sufficient for your system; however, this may be an issue regarding voltage regulation from your PSU. The addition of another graphic card cause a larger voltage drop from the PSU, and under the settings you currently have, the VRM is having difficulty compensating for the larger oscillation. You may be able to achieve stability by slightly bumping up the voltages of the CPU up a notch.

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Until I get the Kill A Watt, What do you think of this PSU, I would have liked to have stuck with Corsair but Canada Computers has this on sale for $114. 

OCZ ZX Series 850W Fully-Modular 80PLUS Gold

MY BUILD | Intel i7-3770K @ 4.5Ghz | Corsair H115i | MSI Z77A-GD55 | 2 x ASUS STRIX GTX 970 SLI | Corsair Vengeance 16GB LP 1600Mhz | Intel 330 180GB SSD + 2x Seagate Barracuda 1TB + 2x WD Red 2TB | OCZ ZX 850W 80+Gold | NZXT H442 Razer Edition | LG 34UC88-B 21:9 3440x1440 | Razer Kraken | Razer Blackwidow Ultimate 2013 | Razer Naga 2013 | Logitech Z-2300 | Steam/Xbox Live Gamertag: Jay Slasher

 

 

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850 watt is overkill.

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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Better to have too much then too little.

750 watts would suffice big time.

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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if you can find a better PSU for a better price at 750W i'd be up for it but the OCZ 80Plus Gold 850W Modular for $114 new seems to be the best bang for buck. Most 750W are over $129 (After MIR) and only 80Plus Bronze and not necessarily modular.

Edited by jmohamed

MY BUILD | Intel i7-3770K @ 4.5Ghz | Corsair H115i | MSI Z77A-GD55 | 2 x ASUS STRIX GTX 970 SLI | Corsair Vengeance 16GB LP 1600Mhz | Intel 330 180GB SSD + 2x Seagate Barracuda 1TB + 2x WD Red 2TB | OCZ ZX 850W 80+Gold | NZXT H442 Razer Edition | LG 34UC88-B 21:9 3440x1440 | Razer Kraken | Razer Blackwidow Ultimate 2013 | Razer Naga 2013 | Logitech Z-2300 | Steam/Xbox Live Gamertag: Jay Slasher

 

 

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if you can find a better PSU for a better price at 750W i'd be up for it but the OCZ 80Plus Gold 850W Modular for $114 new seems to be the best bang for buck. Most 750W are over $129 (After MIR) and only 80Plus Bronze and not necessarily modular.

 

Pick up the 850w

Edited by Nicholas Marzio

\

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Did you already buy the power supply OP?

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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Not yet, today at some point most likely.

MY BUILD | Intel i7-3770K @ 4.5Ghz | Corsair H115i | MSI Z77A-GD55 | 2 x ASUS STRIX GTX 970 SLI | Corsair Vengeance 16GB LP 1600Mhz | Intel 330 180GB SSD + 2x Seagate Barracuda 1TB + 2x WD Red 2TB | OCZ ZX 850W 80+Gold | NZXT H442 Razer Edition | LG 34UC88-B 21:9 3440x1440 | Razer Kraken | Razer Blackwidow Ultimate 2013 | Razer Naga 2013 | Logitech Z-2300 | Steam/Xbox Live Gamertag: Jay Slasher

 

 

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Until I get the Kill A Watt

 

don`t bother,some dude tested 3 way 670 + i7 with some oc and everything and posted on TTL`s forum.688W max recorded. AT WALL.so ~585 actual draw from psu -150W(1 card) . i say ur good.

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Your scenario is not valid. You're running a higher wattage PSU than him.

 

That was meant as two separate thoughts, sorry. I wanted to know "what makes him think he doesnt have enough wattage?" and he asked for a possible alternative PSU to buy "I have a 750W Corsair."

CPU: i5 4670k • Cooler: Corsair H100i • Motherboard: MSI Z87 MPOWER • RAM: Crucial Ballistix Elite 2x 8GB • Storage: Samsung 840 250GB SSD, 2x WD Red 3TB • GPU: EVGA GTX 780 3GB • PSU: Corsair RM750W • Case: Corsair 750D • Mouse: Razer Naga 2012 (I actually use the thing for productivity/media buttons) • Keyboard: Ducky Shine 3 w/ Browns - Green LED • Monitor: Asus PB278Q 27" 2560 x 1440, ASUS PB238Q 23" 1920x1080 • Lighting: 2m NZXT Sleeved Blue LED Strip • pcpartpicker.com/p/3cHfZ

 

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don`t bother,some dude tested 3 way 670 + i7 with some oc and everything and posted on TTL`s forum.688W max recorded. AT WALL.so ~585 actual draw from psu -150W(1 card) . i say ur good.

Can you give a link?

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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SOooo, contrary to your recommendation that the 650 was going to be enough, I bought the OCZ 850W, installed it and took the opportunity to not only finally have modular cable management but also reseat my Noctua NH-D14. Already the system has returned to normal stability. (from superficial observations). Now to stress it more thoroughly.

 

2013-07-06171626_zps64768f7c.jpg

 

MY BUILD | Intel i7-3770K @ 4.5Ghz | Corsair H115i | MSI Z77A-GD55 | 2 x ASUS STRIX GTX 970 SLI | Corsair Vengeance 16GB LP 1600Mhz | Intel 330 180GB SSD + 2x Seagate Barracuda 1TB + 2x WD Red 2TB | OCZ ZX 850W 80+Gold | NZXT H442 Razer Edition | LG 34UC88-B 21:9 3440x1440 | Razer Kraken | Razer Blackwidow Ultimate 2013 | Razer Naga 2013 | Logitech Z-2300 | Steam/Xbox Live Gamertag: Jay Slasher

 

 

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SOooo, contrary to your recommendation that the 650 was going to be enough, I bought the OCZ 850W, installed it and took the opportunity to not only finally have modular cable management but also reseat my Noctua NH-D14. Already the system has returned to normal stability. (from superficial observations). Now to stress it more thoroughly.

 

2013-07-06171626_zps64768f7c.jpg

Glad you got something that worked. Even if it is too much wattage, a PSU is most efficient around 40% load. So, it'll have a longer life and produce less heat anyway.

CPU: i5 4670k • Cooler: Corsair H100i • Motherboard: MSI Z87 MPOWER • RAM: Crucial Ballistix Elite 2x 8GB • Storage: Samsung 840 250GB SSD, 2x WD Red 3TB • GPU: EVGA GTX 780 3GB • PSU: Corsair RM750W • Case: Corsair 750D • Mouse: Razer Naga 2012 (I actually use the thing for productivity/media buttons) • Keyboard: Ducky Shine 3 w/ Browns - Green LED • Monitor: Asus PB278Q 27" 2560 x 1440, ASUS PB238Q 23" 1920x1080 • Lighting: 2m NZXT Sleeved Blue LED Strip • pcpartpicker.com/p/3cHfZ

 

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The 650w unit was indeed enough. Here's a post regarding another setup with a 550w platinum that can function as a 650w gold unit powering OCed two 680 in SLI and an OCed 3770k with a custom water loop. http://www.overclock.net/t/1354641/seasonic-x-1250-noisy-update-seasonic-admit-x-1250-units-may-have-unstable-fan-control

 

I'm used to having a silent PSU, my Super Flower Golden King 550W never turned it's fan on other than in really hot and very high power draw situations. Example: I had two 18W pumps, two GTX680's overclocked and Folding and a 3770K at 4.6GHz Folding, four HDD, one SSD, a ton of fans, loads of LEDs ect. Even then the fan wasn't on all the time, it'd turn off after a while and cycle like that. Apart from that it was never on and hasn't been on in months.

 

Of course, that's a higher-end premium unit than the TXv2, but it shows that you could have been fine with the 650w. You just needed to adjusted the settings of your overclock a bit, as I had explained previously.

 

Either way, you got a solid fully modular unit at a very good price, so enjoy your new hardware. Just used what I had said before as a reminder in case something similar like this happen again in the future, if you swap to a more power hungry component.

Edited by quan289
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I did mention that dropping the overclock and returning the system to factory state didn't produce any positive results? I may have forgotten to do that. I also attempted to adjust the voltage by increasing it beyond the previously stable voltage with no luck. I haven't overclocked the CPU yet with the new PSU, but i'm going to see how it goes as I get some more time today.

MY BUILD | Intel i7-3770K @ 4.5Ghz | Corsair H115i | MSI Z77A-GD55 | 2 x ASUS STRIX GTX 970 SLI | Corsair Vengeance 16GB LP 1600Mhz | Intel 330 180GB SSD + 2x Seagate Barracuda 1TB + 2x WD Red 2TB | OCZ ZX 850W 80+Gold | NZXT H442 Razer Edition | LG 34UC88-B 21:9 3440x1440 | Razer Kraken | Razer Blackwidow Ultimate 2013 | Razer Naga 2013 | Logitech Z-2300 | Steam/Xbox Live Gamertag: Jay Slasher

 

 

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And once again thanks for all the advice from everyone in this thread.  :wub:

MY BUILD | Intel i7-3770K @ 4.5Ghz | Corsair H115i | MSI Z77A-GD55 | 2 x ASUS STRIX GTX 970 SLI | Corsair Vengeance 16GB LP 1600Mhz | Intel 330 180GB SSD + 2x Seagate Barracuda 1TB + 2x WD Red 2TB | OCZ ZX 850W 80+Gold | NZXT H442 Razer Edition | LG 34UC88-B 21:9 3440x1440 | Razer Kraken | Razer Blackwidow Ultimate 2013 | Razer Naga 2013 | Logitech Z-2300 | Steam/Xbox Live Gamertag: Jay Slasher

 

 

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Not sure why people are acting like the 670 FTW is like a normal 670 because its not. Anyways, glad you got it fixed!

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 Here's a review of the EVGA GTX 670 FTW Signature 2: http://www.techpowerup.com/reviews/EVGA/GTX_670_FTW_Signature_2/25.html

 

It uses a $1500 equipment to measure the power draw of the card at DC power. This allow you to isolate the power draw of the card with the lowest margin of error without factoring efficiency of the PSU and other components. As you can see, the power draw is 180w max during Furmark and averaging around 154w during gaming load. It didn't deviate too far off of some of the ~150w estimation.

 

I did mention that dropping the overclock and returning the system to factory state didn't produce any positive results? I may have forgotten to do that. I also attempted to adjust the voltage by increasing it beyond the previously stable voltage with no luck. I haven't overclocked the CPU yet with the new PSU, but i'm going to see how it goes as I get some more time today.

 

Ah, you didn't mentioned that. Being about to be unable to power it even at stock is quite odd. The power draw of your system shouldn't be more than ~500wDC even during Prime95+Furmark/Kombuster. If I were to take a guess, due to the fact that the TX650v2 forces you to used molex adapters, there may have been a voltage drop cause by in loose, insecure connection. There's a few times where I helped someone or read threads of people who had used these adapters/extensions, that cause a huge voltage drop by itself.

 

Good luck with your overclocks on this new unit though. Report back the results when you get around doing it.

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So before with the previous 650w I literally couldn't have Google chrome open with two vlc instances running at the same time, the system had become so unstable even at stock clock and voltage. The new PSU seems to be working find however, at 4.5Ghz OC at 1.235V with Temps around 75degrees under Prime 95. Furmark will push GPU 1 to 88 degrees with GPU 2 at 82 under burn in.

 

All of the stability issues are gone now it seems.

 

I did check the connections on the molex adapters for the GPU's they seemed snug and fine. The System started out fine when I put in the 2nd GPU but after leaving it on (pretty much idle over night) the next day all the issues started to happen and just didn't seem to want to go away no matter the troubleshooting. Its just so odd. 

MY BUILD | Intel i7-3770K @ 4.5Ghz | Corsair H115i | MSI Z77A-GD55 | 2 x ASUS STRIX GTX 970 SLI | Corsair Vengeance 16GB LP 1600Mhz | Intel 330 180GB SSD + 2x Seagate Barracuda 1TB + 2x WD Red 2TB | OCZ ZX 850W 80+Gold | NZXT H442 Razer Edition | LG 34UC88-B 21:9 3440x1440 | Razer Kraken | Razer Blackwidow Ultimate 2013 | Razer Naga 2013 | Logitech Z-2300 | Steam/Xbox Live Gamertag: Jay Slasher

 

 

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The 670 FTW cards consume 180 watts at maximum. http://www.techpowerup.com/reviews/EVGA/GTX_670_FTW_Signature_2/25.html

Link already mentioned.

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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