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Possible SLI Build, Need somone who really knows PSU'S

post #1 of 7
Thread Starter 
Ok so I am going to be upgrading here in the next week or so to a new build and I am considering getting 2x GTX 670 cards instead of just one. My main question is about the PSU that I would need. I am going to list my current build and then the build I am going to be upgrading to.

Current Build:

OS: Win 7 64bit
Mobo: Gigabyte GA-870A-UD3
CPU: AMD Phenom II x4 955 Black Edition
GFX: XFX Radeon 5850 HD
RAM: G.Skill Ripjaws DDR3 8GB(4x2) 1600mhz
PSU: Antec Basiq 550W Plus (+5v 26A) (+3.3v 28A) (+12v 22A) (+12v 22A) (+12v 25A) (-12v .05A) (+5Vsb 2.5A) (+3.3v/+5v max output is 150W)
HDD: Western Digital 7200 RPM 1TB
Case: Cooler Master HAF 932

Upgrading To:

CPU: Intel Core i5 4670K 3.4GHz Socket LGA 1150
Mobo: ASROCK Z87 Extreme4 Socket LGA 1150 Z87 ATX
GFX: 2x EVGA NVIDIA GeForce GTX 670 FTW Superclocked 2048MB GDDR5 PCIe 3.0 x16

Re-using the rest of my other parts.

So, my question is this. I used the PSU calc from this site, input all the information listed above and it recommended 550W PSU. In fact, it even lists my current PSU as one of many recommended products to use. The help section in the program also states that the program slightly over-recommends on wattage to give head room. Is this true? Do I need to upgrade to like a 750W PSU or am I totally safe upgrading and keeping my current PSU? I should also note that I plan to do some "light" over-clocking. That is, I will only go as far as I can before I have to start messing with voltages and then I stop because I am not comfortable messing with voltage.

I should also note that purchasing the two cards with my other upgrades is pushing my budget limit so if I have to get a new PSU for the cards I would rather just drop a card for now and get the PSU instead and grab a second card later down the road.
post #2 of 7
Since the basiq 550 is a decent psu, it should run. But you would stress the psu, thus reducing its life span.
If i was you i would go with something like a Corsair AX 760i, Seasonic 660 Platinum, or Coolermaster Silent pro gold 800. Better to be safe than sorry. smile.gif
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SchnitzelHack G5
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post #3 of 7
Relevant to my interests.

If the PSU was brand new I would say no problem. Questionable though and I don't know the answer for sure, so I will wait for a response. Personally id recommend a new PSU and a 680 or 770 instead of your plan for sli
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post #4 of 7
The problem with your Basiq 550 Plus is that it can only deliver a maximum of 384w (or 32A) total on its 12v rails, as seen on its label:

17-371-016-07.jpg

Since a single GTX 670 FTW can consume a maximum of 180w (or 15A) as seen in the chart below, there's absolutely no way that your PSU could handle two of them + an i5-4670K.

All is not lost however, as you can get the very nice Rosewill Capstone 750w (with 4 PCIe connectors, no less) for $100. It can deliver all its rated wattage on its single 12v rail, so it would have no problem with your proposed configuration.

GTX 670 FTW Power Consumption:
power_maximum.gif
Edited by svenge - 6/11/13 at 11:51pm
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by TheSchnitzelkil View Post

Since the basiq 550 is a decent psu, it should run. But you would stress the psu, thus reducing its life span.
If i was you i would go with something like a Corsair AX 760i, Seasonic 660 Platinum, or Coolermaster Silent pro gold 800. Better to be safe than sorry. smile.gif

Ok, well in that case I'll drop one card for now and go for the PSU and pick up another card later when I have some extra cash. Another question for you though, at my local microcenter they have both the AX760i and the AX860i. The 860 is literally the same price as the 760i ($209) after rebates. Should I just give myself the extra room and go with the 860?

EDIT: Actually, what do you think of this PSU? It was on the recommended list, and JohnnyGuru gave it a 9.7 out of 10.

http://www.microcenter.com/product/380852/Lazer_Gold_Series_850_Watt_ATX_Modular_Supply (saves $60)
Edited by Sheresh - 6/12/13 at 12:12am
post #6 of 7
Quote:
Originally Posted by Sheresh View Post

Ok, well in that case I'll drop one card for now and go for the PSU and pick up another card later when I have some extra cash. Another question for you though, at my local microcenter they have both the AX760i and the AX860i. The 860 is literally the same price as the 760i ($209) after rebates. Should I just give myself the extra room and go with the 860?

EDIT: Actually, what do you think of this PSU? It was on the recommended list, and JohnnyGuru gave it a 9.7 out of 10.

http://www.microcenter.com/product/380852/Lazer_Gold_Series_850_Watt_ATX_Modular_Supply (saves $60)

That kingwin is also really good, superflower (real manufacterer) always makes terrific power supplies. 80plus gold instead of platinum, but still if you can get your hands on one go for the kingwin. thumb.gif
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post #7 of 7
Dont buy a Cosair AX860i its overpriced overhyped and has problems with colil whine

All the other Cosair AX´s has the same problem as well maybe not as bad but they still do it
Quote:
Originally Posted by TheSchnitzelkil View Post

That kingwin is also really good, superflower (real manufacterer) always makes terrific power supplies. 80plus gold instead of platinum, but still if you can get your hands on one go for the kingwin. thumb.gif

I second this as well get a Super Flower unit

Last you dont need more then 750 watts for s system with two video cards
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