750 watt PSU & SLI

Joe_The_Plumber

Joe_The_Plumber

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Apr 10, 2008
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Hey guys.... some of you may remember a few of my threads back when I was building and asking for advice on my first computer build. Welp, I have another question.

I am thinking about getting another gtx 770 and put it in SLI, and I'm unsure about the PSU. I've done some research and looked up some specs and it seems pretty divided. Most people say that you need at least a 850 watt PSU to run SLI, but there are some that say a 750 will work fine as well.

I do not plan on overclocking these cards or the CPU at this moment so it would be running at stock. These cards come out of the box overclocked a little bit (at least I think) and so I'm a little unsure.



Here is the exact card:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130922&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

Here is my exact PSU:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=



So does anyone here have an SLI setup? And if so what kind of power supply do you have? Do you guys think the 750 PSU will be sufficient or should I upgrade that as well just to be safe? Also what kind of problems should I expect if I stay with the 750 and it's not enough?
 
Yup ur good. Corsair is very reliable and 80plus gold is vat u vant. Have fun
 
Muffs said:
Another 770 O:< Why?
Click to expand...

Haha well it was somewhat planned from the beginning, so I have the money saved up for it. It was an idea that I threw around but didn't really think about how other parts may effect it (for example, never thought about the PSU for some reason). BF4 is coming out and one 770 simply won't play on ultra with good enough fps, so that is a main reason. A few other games as well. Another is.... well, I'll eventually do it later on when I need to upgrade so I mine as well now.

Thanks for responding though. I had hoped the HX750 was good enough for what I heard and expected from it, so that's good to hear
 
Joe... I want you to understand something, when it comes to power supply(PSU) you don't need people's voodoo advice :). The only advice you need to seek is reliability. which psu will crack when it's hot and which one will last thru a desert dust storm.

There is absolutely no mythology to this, it's just addition, everything inside of that computer uses some form of wattage. Processors are averaging about 190 watts, with some of the newer AMD big bodies going to 220. So check your processor for wattage, do the same for the motherboard, each individual video card, the ram, sound card (if you got it), fans, floppy diskette drive, I use 5" (I'm KIDDING)..., but DVD Drive. all usb devices connected at once (if that's possible, otherwise choose the biggest power eaters)... anything that uses watts on a computer add it together. Then pick the appropriate power supply.

Some tips...

1) when you go shopping for your power supply and you see "SLI READY!" or "CROSSFIRE READY!" I want you to laugh at the representative trying to sell you this junk. There is no such thing. The only thing that would make a power supply "READY!!!!!" for one of these two features would be the fact that the power connectors are already there. But when you buy the video cards they almost 99% of the time come with an adapter. I helped build my buddies new computer on a $1500 budget for $800. Because I ignored those stupid marketing schemes. (this also means i7 core ready, or amd FX ready) POWER IS POWER-remember this. Almost every power supply comes with all the connectors to fit both brands.

2) Re manufactured is GOOD. Something went wrong but they took a second look, and fixed it. They did a DETAILED service on that device to make sure it won't fail again and it should carry with it all the same warranty that a brand new one does. So does this mean? Same product as brand new for LESS money!!!!!!!!

3) Build for the future, all these kid terms like "future proof" may actually apply to this... computers degrade... motherboards get old and can't process like newer ones, north bridges get updated... Graphic cards can't support newer games. Power is power my friend. It never changes... it's either Direct or Alternating Current... You could potentially run a brand new rig on a 300Watt power supply for quite some time (until you process something that requires more power at which point it'll go past that 300 watt threshhold).

That said (I hope I didn't confuse you). The power supply you buy today will still be good 3-5 years from now in terms of connecting and fit, I don't foresee massive changes in the computer case architecture or them upping the connector pins anytime soon. So buy a power supply that is beyond your threshold-Why? So when you upgrade your video card or processor... and it's using more juice you don't have to upgrade your psu... when you build a new rig in 2 years that psu will still be good. And I guarantee you if something is wrong-there is an adapter to fix it that cost like $2-$5... It's WAY better to pay $ now then to wait til later... you ultimately waste less $. And as we went over... what works now in the PSU world will work later on.

Good luck.

Try PC Part Picker for listings... http://pcpartpicker.com/ And you can make sure it'll work with your computer on there as well.

Last tid bit. Stay off of Craigslist for any computer parts-People who sell on craigslist have this sense that they paid $2000 for a computer and should be able to sell it for $1800 a year later. Little do they understand a computer is like a very good car. as soon as you put it all together it just dropped 50% in it's value-Don't let them sucker you in. Good luck bud!

CPU Listings and wattage:
AMD: FX
http://en.wikipedia.org/wiki/List_of_AMD_FX_microprocessors

I got that by going to google and typing in this: AMD FX 8350 wiki. But a similar query of Intel, or ATi or nVidia will surely get you similar results! GL!
 
Good Calc Silent. Joe check that out but I'd still advise you to get a nice powerful PSU to prepare you for future computer builds.
 
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