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EVGA GTX 670 2-way SLI, i5-3570k 620W PSU ok??

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July 13, 2012 1:13:15 PM

Hi guys,

I'm going the SLI route, I used power calculator to get how much power I need for my PSU but it didn't have GTX 670 listed so, I used 680s in SLI.

Here is my specs:
2-3HDD
2SSD
i5-3570k (run stock but I might OC in the future)
EVGA GTX 670 2-way SLI FTW Edition
Corsair 600t (2-200mm fans 1-120mm fan with LED)
2 x 4GB DDR3 RAM

Might add a few LEDS and some slight optimzations in the future.

IS this PSU okay, or should I RMA it and buy a 700-750W one?


a c 122 ) Power supply
July 13, 2012 1:21:49 PM

I would RMA it and buy a 750W it might be o.k. but i wouldn't risk it i have seen some on here say a 550W you can SLI 670 but i don't believe that one bit
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July 13, 2012 1:25:08 PM

Thank you. Also Ithis might be a very stupid question but, What are those SLI bridges used for?

Can't I just plug my 2-GTxs into the PCI slots and thats all?

Also, do you have any recommedations with 750W PSUs?
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a c 158 ) Power supply
July 13, 2012 1:32:18 PM

What is the make and model of the PSU? Ar eyou planning on OC for the CPU/GPUs?

A system with two GTX 670 running in 2-way SLI mode requires a 700W PSU with at least 48A on the 12V rails and four 75W 6-pin PCIe power connectors. Amps on the 12V rails is more important than the wattage rating of the PSU; most of the power draw in modern PCs comes from GPU/CPU power draw on the 12V rails. Real-world power draw in a system using a highly OCed, power-hungry i7 965 was 433W (293W from the GPUs): http://www.guru3d.com/article/geforce-gtx-670-2-and-3wa... A good quality 620W PSU is likely to be electrically sufficient but probably won't have the required power connectors. You can use molex-PCIe adapters or 8-pin y-splitters to get more PCIe connectors.
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a b ) Power supply
July 13, 2012 2:23:54 PM

I currently run 2 560 448s in SLI with my 3930...all OC'd and pull about 500w from the wall under stress...which means ~450w from the psu. The 670s are about the same or a little better than a 560 448. A 3570 will draw less power than a 3930. A good 620w power supply with the proper connections will probably run fine: they are designed to run efficiently for a long time at high load, so 70-75% is okay if you have a good one like a Seasonic S12II or the equivalent Antec HCG unit. I used to run a Seasonic X-660 for this box and had no problem...I only upgraded because I do distributed computing and was running a 3rd GPU for awhile.

I can't tell from your post whether you already bought the PSU or are thinking of buying one. If you already bought it and its a good quality unit, I'd keep it rather than switch to a lower quality 750 for example. If you haven't purchased it, even with my willingness to run psus at high load for months, I'd consider a little more power like Rugger suggests.
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July 13, 2012 3:10:41 PM

Thanks. I haven't decided whether or not I'm going to OC the GPU/CPU.

I will be running a single 1440p monitor, with plans to add a second one in the future.

Can you please help with the bridge situation, does the bridge come with the motherboard package?
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July 13, 2012 3:19:06 PM

Temile said:
I currently run 2 560 448s in SLI with my 3930...all OC'd and pull about 500w from the wall under stress...which means ~450w from the psu. The 670s are about the same or a little better than a 560 448. A 3570 will draw less power than a 3930. A good 620w power supply with the proper connections will probably run fine: they are designed to run efficiently for a long time at high load, so 70-75% is okay if you have a good one like a Seasonic S12II or the equivalent Antec HCG unit. I used to run a Seasonic X-660 for this box and had no problem...I only upgraded because I do distributed computing and was running a 3rd GPU for awhile.

I can't tell from your post whether you already bought the PSU or are thinking of buying one. If you already bought it and its a good quality unit, I'd keep it rather than switch to a lower quality 750 for example. If you haven't purchased it, even with my willingness to run psus at high load for months, I'd consider a little more power like Rugger suggests.



Thanks,I ordered the Seasonice M12II 620 Bronze PSU, it arrived but I haven't built the machine yet,so it's still in the box.


SHould I RMA it and get a 750W?
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a c 158 ) Power supply
July 13, 2012 3:21:31 PM

"SLI connectors are included with all NVIDIA SLI-Ready motherboards and with all SLI-Ready PCs": http://sli.nvidia.com/page/slizone_faq.html The FAQ also incudes a description of the connector and what to do if your mobo didn't come with it.
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a c 158 ) Power supply
July 13, 2012 3:27:54 PM

If you can get the retailer to absorb the shipping or waive the restocking fees, then it may be worth it to ge the MKII above. You avoid the cost of the adapters/splitters for the M12II 620W. If you're not immediately going to SLI, then I'd stick with the current PSU and just get the adapters later on when you decide to SLI.
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July 13, 2012 3:36:00 PM

Rugger said:
What is the make and model of the PSU? Ar eyou planning on OC for the CPU/GPUs?

A system with two GTX 670 running in 2-way SLI mode requires a 700W PSU with at least 48A on the 12V rails and four 75W 6-pin PCIe power connectors. Amps on the 12V rails is more important than the wattage rating of the PSU; most of the power draw in modern PCs comes from GPU/CPU power draw on the 12V rails. Real-world power draw in a system using a highly OCed, power-hungry i7 965 was 433W (293W from the GPUs): http://www.guru3d.com/article/geforce-gtx-670-2-and-3wa... A good quality 620W PSU is likely to be electrically sufficient but probably won't have the required power connectors. You can use molex-PCIe adapters or 8-pin y-splitters to get more connectors.



Thanks, it looks like this will work with everything you listed

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Is it okay with the 20+4 pins, though. I'm slightly concerned like i said my mobo is 24 pins, everything else looks ok?

Fully modular,etc
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a c 158 ) Power supply
July 13, 2012 5:18:33 PM

Awesome PSU! The 20+4 pin mobo connector is designed to work as either a 20-pin or as a 24-pin connector; it is caompatible with your 24-pin mobo.
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a c 264 ) Power supply
July 13, 2012 5:22:00 PM

With a 1440 x 900 monitor you need a GTX 560/HD 6850 level card to max every game. Running 2 of them a single GTX 670 is more than enough. Don't waste money on a high end gaming computer with low end monitors. Spend the money from one of the planned GTX 670s on a pair of nice 1920 x 1080 monitors.
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a c 158 ) Power supply
July 13, 2012 5:24:16 PM

+1 - great suggestion on monitors!
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a c 264 ) Power supply
July 13, 2012 5:25:55 PM

Yeah planning $800 for video cards to drive a $99 monitor is insane.
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a c 158 ) Power supply
July 13, 2012 5:33:16 PM

LOL
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July 13, 2012 5:57:21 PM

Each 670 needs 170 watts so you're looking at 340W and that leaves you with 260W for the rest of your hardware. It should work fine.
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a c 243 ) Power supply
July 13, 2012 5:58:45 PM

anort3 said:
With a 1440 x 900 monitor you need a GTX 560/HD 6850 level card to max every game. Running 2 of them a single GTX 670 is more than enough. Don't waste money on a high end gaming computer with low end monitors. Spend the money from one of the planned GTX 670s on a pair of nice 1920 x 1080 monitors.

Maybe he's talking about a 27" 2560 x 1440 ?

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a c 264 ) Power supply
July 13, 2012 7:09:23 PM

Yep, you might be right. He did say a 1440p monitor.........I totally overlooked that. Oh well my advice was correct if you meant 1440 x 900. If you meant a 2560 x 1440 monitor then carry on with your orignal plan and ignore me! :whistle: 
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a c 122 ) Power supply
July 13, 2012 7:25:28 PM

exhibitO said:
Thanks, it looks like this will work with everything you listed

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Is it okay with the 20+4 pins, though. I'm slightly concerned like i said my mobo is 24 pins, everything else looks ok?

Fully modular,etc

Great PSU it's compatible so no worries ;) 
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July 14, 2012 8:10:48 PM

delluser1 said:
Maybe he's talking about a 27" 2560 x 1440 ?



Thanks guys, I did mean a 2560 x 1440 27" IPS monitor. It's being shipped from Korea :-)

Does anyone think the GTX 670 wouldn't be "upper" range anymore on this resolution? Should I be looking to add a 2-way SLI?
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a b ) Power supply
July 14, 2012 8:18:18 PM

exhibitO said:
Thanks guys, I did mean a 2560 x 1440 27" IPS monitor. It's being shipped from Korea :-)

Catleap? A friend just got two of them...they're amazing.
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July 14, 2012 8:28:12 PM

Temile said:
Catleap? A friend just got two of them...they're amazing.



How did you know :-p, yes it's on it's way


I'm think I'll order another 670, I think one might struggle slightly on max settings at this resolution. what do you guys think..

As far as power draw, I know realistically I'm probably in the high 500 range, but I want to future proof this thing once and for all. thanks
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a c 264 ) Power supply
July 14, 2012 9:08:10 PM

The GTX 670 is only about 7%-8% slower than a GTX 680. According to Tom's best graphics cards for the money article the GTX 670 delivers great 2560 x 1600 performance.

http://www.tomshardware.com/reviews/gaming-graphics-car...

Try one and see how it does. If it's not delivering what you want get a second card.
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July 14, 2012 9:14:28 PM

Best answer selected by exhibitO.
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July 14, 2012 9:15:15 PM

anort3 said:
The GTX 670 is only about 7%-8% slower than a GTX 680. According to Tom's best graphics cards for the money article the GTX 670 delivers great 2560 x 1600 performance.

http://www.tomshardware.com/reviews/gaming-graphics-car...

Try one and see how it does. If it's not delivering what you want get a second card.

Thanks, I'll pull the trigger on the 750W HX Corsair PSU.


My buddy seems to think since I'm RMA I should get a 850 for complete future proof, but i think thats utter overkill.. even for future proofing, no?
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a c 264 ) Power supply
July 14, 2012 9:29:49 PM

It's not overkill, overkill would be a 1200w monster! 750 watts is fine for a dual GTX 670 system though.
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a c 122 ) Power supply
July 15, 2012 5:23:56 AM

exhibitO said:
Thanks, I'll pull the trigger on the 750W HX Corsair PSU.


My buddy seems to think since I'm RMA I should get a 850 for complete future proof, but i think thats utter overkill.. even for future proofing, no?

A 850W is not overkill and i would do the same a 750W will be more than fine but 850 would be better for future proofing IMO :) 
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a b ) Power supply
July 15, 2012 2:47:38 PM

This topic has been closed by Mousemonkey
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