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Need PSU Advice for GTX 670 FTW SLI

post #1 of 6
Thread Starter 
This is my first time posting on this forum. I've been a lurker for a long time, and the information and advice here is great. So, as you can see from my rig, I have a 600 W PC Power and Cooling Silencer Mk III. I recently got a smoking deal on another GTX 670 FTW, so I want to go to SLI. This was my first build, so I was not smart enough to oversize my psu enough (I did not plan on SLI). I know I'm on the edge, but do I have any chance of sticking with this psu, or should I upgrade for sure? Cash is tight, so I'm hoping to at least put the upgrade off for a bit. My CPU is mildly overclocked to 4.1. Since I going to SLI, I don't plan to overclock the GPUs. Thanks.
post #2 of 6
Welcome to OCN

You could keep your PSU but you would not have much room left on it and the fan would run close to max speed
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Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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post #3 of 6
You could easily power two GTX 670 FTWs + whatever CPU you have to 4.1Ghz (Assuming i5-3570K I presume?).

http://www.techpowerup.com/reviews/EVGA/GTX_670_FTW_Signature_2/25.html

You are looking at about at maximum, a 180w power draw of each card at stock at full maximum load. Normal usage isn't going to come close to hitting 100% load on both GPUs, so expect a lot lower power draw than 360w total for those cards. Probably more in the 200w range.

And the unit you have is a very solid unit that should be more than capable of powering this setup. You should be fine keeping it thumb.gif

Edit:

According to Bit-tech's review on the i5-3570k, they have the 3570k @ 5Ghz only pulling 267w. (Source)

So by that estimate, you'd probably be running more along the lines of the 200w mark at your frequencies. So you still can fit in that entire system onto your PSU fairly easily, although maybe down the line if you plan on doing heavier overclocks on both your CPU and GPU, you'd want a slightly higher powered unit (750w) to give you some headroom.
Edited by Kinaesthetic - 7/19/13 at 9:46am
post #4 of 6
Yeah think even with a overclocked CPU power draw from the wall with two GTX 670 cards would be around 450 watts give or take
Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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Reply
Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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Reply
post #5 of 6
Thread Starter 
Thanks for the quick replies. I'll live with the high fan speed noise for a while, and upgrade in the future. The estimators I had used put me in the range of a 540 W PSU (for realistic headroom) needed, but I was not confident that would translate into real world usage. Yes on the i5-3570k.
post #6 of 6
Quote:
Originally Posted by c76man View Post

Thanks for the quick replies. I'll live with the high fan speed noise for a while, and upgrade in the future. The estimators I had used put me in the range of a 540 W PSU (for realistic headroom) needed, but I was not confident that would translate into real world usage. Yes on the i5-3570k.
You received great advice already, but I should add that noise shouldn't be a problem either considering you'll be running two 670s that will easily cover in full load anything coming from the PSU. wink.gif
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