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Dreamingawake
11-15-07, 03:16 AM
Hey all, I've got a 450 Watt Psu, system specs in sig. I'm just wondering
if my Psu is strong enough for me to get a 2nd GTS 640mb.

Thanks in advance for your input !! :)


Here's a link to my actual case, and Psu with specs.
http://www.coolerguys.com/840556060444.html

SLippe
11-15-07, 03:38 AM
I doubt it.

odin20
11-15-07, 11:49 AM
Definitely not bro. Sli takes a 650 minimum and 750 to be sure.
If its a good power supply you can get away with 650 to 700 but i would reccomend a pc-power and cooling 750 silencer.
It has 4 built in 6 pin molex's for vid cards and 2 8 pins for future video cards that use them.
450 will barely run one gtx with a couple hard drives, and the gts pulls close to the same power, 2 of them would kill a 450.

Joe Public
11-15-07, 12:23 PM
2 GTS in SLI would run fine on a decent PSU like the Corsair HX620, I know I have power to spare on mine to add another GTS. Right now I'm drawing short of 200W at max load, with another GTS i'd hit a bit over 300W. Planning to put a quad core with OC in there, add another 100W to that. A 450W would probably be loaded near its max limits tho, so you should get a new PSU just to be sure.

[EOCF] Tim
11-15-07, 12:31 PM
Definitely not bro. Sli takes a 650 minimum and 750 to be sure.
If its a good power supply you can get away with 650 to 700 but i would reccomend a pc-power and cooling 750 silencer.
It has 4 built in 6 pin molex's for vid cards and 2 8 pins for future video cards that use them.
450 will barely run one gtx with a couple hard drives, and the gts pulls close to the same power, 2 of them would kill a 450.

lol, I don't think so, Corsair HX620 runs all this overclocked and 7 120mm fans :

Intel C2Q Q6600 G0
eVGA nForce 680i SLI A1 P30
Geforce 8800GTX 768MB SLI
Corsair 4Gb TWIN2X2048-6400C4
Corsair HX620w
WD Raptor 74Gb, Samsung 250Gb, 400Gb
Creative X-fi Xtrememusic
(1600)x9 : 3.6Ghz 1.5v - Dram 800Mhz 4-3-3-12-2T 2.1v
GTX's : 648 / 1620 / 2052Mhz

You just need a good PSU.

But yea 450w is definitely not enough.

odin20
11-15-07, 12:49 PM
You quoted my post and then said "lol, i don't think so" ?
What are you talking about. Then you agree at the end...im so confused.
Hes asking about sli not single card.
You are running a 620 watt psu with sli so what exactly are you talking about? So you are running close to the bare minimum for sli i said 650 and you have 620 so what exactly is your point. Go read the sli-forums and the reccomended specs for psu's they start at 750 watt for 8800's. I know they will run on lower which is why i said 650 and you are in a 650 class power supply bracket. And just because something runs at a certain wattage doesnt mean everythings ok. If you run peak wattage all the time and go over at times it can and will kill your ps eventually. Im glad yours works and hope it does for a long time.
What are you lol'ing about?

Bman212121
11-15-07, 12:57 PM
You quoted my post and then said "lol, i don't think so" ?
What are you talking about. Then you agree at the end...im so confused.
Hes asking about sli not single card.
You are running a 620 watt psu with sli so what exactly are you talking about? So you are running close to the bare minimum for sli i said 650 and you have 620 so what exactly is your point. Go read the sli-forums and the reccomended specs for psu's they start at 750 watt for 8800's. I know they will run on lower which is why i said 650 and you are in a 650 class power supply bracket. And just because something runs at a certain wattage doesnt mean everythings ok. If you run peak wattage all the time and go over at times it can and will kill your ps eventually. Im glad yours works and hope it does for a long time.
What are you lol'ing about?

He said that you won't need a 650 - 750W PSU to be able to run a GTS SLI because he's running a GTX SLI on a 620W power supply. He agrees that a 450W won't be enough, but chances are a decent 600W PSU would be more than enough to handle it.

Dreamingawake
11-15-07, 01:05 PM
Wow. Thank you all so much for your detailed replies. I guess I'll go grab a new PSU when I get back from my vacation. Really, I appreciate all your answers.

And I cannot wait to go SLI !!! :captnkill:

odin20
11-15-07, 01:33 PM
so i said 650 was the minimum and he said 620 was lol That was the lol comment talk about splitting hairs.
Anyway go to any sli forum and ask or read nvidias own guide and they reccomend much higher. Anyway no biggie just think its funny someone basically agreeing with me yet mocking at the same time over 30 watts....lol

john19055
11-15-07, 03:21 PM
I would get at leat a 650watt with over 50amps on the 12v rail ,even tho I had a Silverstone Zues 560watt with 38amps and it ran my system fine ,the one in my signature.

Preparat
12-08-07, 04:24 PM
http://www.jonnyguru.net/forums/showthread.php?t=3137

ChrisRay
12-08-07, 04:55 PM
No that PSU you will not be strong enough.

Redeemed
12-08-07, 05:04 PM
No that PSU you will not be strong enough.
LOL- look whos back amongst the living. :D

Niot
12-08-07, 06:02 PM
You need like a 500W PSU minimum, so I would say get a 600W one because Nvidia recommends it.

Burnt_Ram
12-08-07, 07:02 PM
I would get at leat a 650watt with over 50amps on the 12v rail ,even tho I had a Silverstone Zues 560watt with 38amps and it ran my system fine ,the one in my signature.
you must have just made the cut with that 560W. i had a 550W Enermax with 36a 12v and it would'nt run my 8800GTS sli setup. i had to buy the PSU in my sig.

Burnt_Ram
12-08-07, 07:04 PM
You need like a 500W PSU minimum, so I would say get a 600W one because Nvidia recommends it.
600W "maybe" but only if it had atleast 40+ amps on the 12v rails, and thats really pushing it!

Niot
12-08-07, 07:24 PM
600W "maybe" but only if it had atleast 40+ amps on the 12v rails, and thats really pushing it!
No, 500W is pushing it. 600W is more than enough.

A quad core system with GTXSLI OC and 4 hard drives plus aftermarket coolers only needs a 500W PSU to run. Not factoring in capacitor aging of course.

Burnt_Ram
12-08-07, 07:39 PM
No, 500W is pushing it. 600W is more than enough.

A quad core system with GTXSLI OC and 4 hard drives plus aftermarket coolers only needs a 500W PSU to run. Not factoring in capacitor aging of course.
lol, i would really like to see a 500W run two GTX'. not freakin likely! a 500W might, and i mean MIGHT run two GTS' but the PS would have to have some real serious amperage! i had a very good 550W with 36a 12v and it wouldnt run two GTS' let alone two GTX'

Niot
12-08-07, 07:45 PM
lol, i would really like to see a 500W run two GTX'. not freakin likely! a 500W might, and i mean MIGHT run two GTS' but the PS would have to have some real serious amperage! i had a very good 550W with 36a 12v and it wouldnt run two GTS' let alone two GTX'
It's been tested already (the link may have been removed). Computers don't need that much wattage.

Burnt_Ram
12-08-07, 08:00 PM
It's been tested already (the link may have been removed). Computers don't need that much wattage.
i'm speaking from experience, and i know from my own experience that a quality 550W doesn't cut it.

i have yet to see anyone run any 8800 SLi setup succesfully with anything less than a very good quality 600W.

i did my homework when i replaced my 550W, and not one person recomended anything less .. i wasnt even comfortable with my 700W in the begining, but it had 60 amps spread across 4 rails so it's ok. (barely) imo. nuff said lets get back on topic, k.

Niot
12-08-07, 08:07 PM
i'm speaking from experience, and i know from my own experience that a quality 550W doesn't cut it.

i have yet to see anyone run any 8800 SLi setup succesfully with anything less than a very good quality 600W.

i did my homework when i replaced my 550W, and not one person recomended anything less .. i wasnt even comfortable with my 700W in the begining, but it had 60 amps spread across 4 rails so it's ok. (barely) imo. nuff said lets get back on topic, k.
Just because yours didn't work doesn't meant that a 500W isn't enough.

The Inquirer did tests and a 500W supply that's a year old can support the most heavily loaded PC. I think their tests mean more than your personal experience.

Amuro
12-08-07, 10:16 PM
Just because yours didn't work doesn't meant that a 500W isn't enough.

The Inquirer did tests and a 500W supply that's a year old can support the most heavily loaded PC. I think their tests mean more than your personal experience.
500W is really pushing it. It might be OK depending on what games you play. But if try to run intensive games like Oblivion, you might get system shut down.

This thread is an example:
http://forums.nvidia.com/index.php?showtopic=14290

Niot
12-08-07, 10:58 PM
500W is really pushing it. It might be OK depending on what games you play. But if try to run intensive games like Oblivion, you might get system shut down.

This thread is an example:
http://forums.nvidia.com/index.php?showtopic=14290
That guy stress tested his system, a quad core (intel) with 2 OCed 8800GTX, I think he used water cooled GTX too, they were OCed a lot.

In the end the system didn't use up 450W at peak or something like that (Inquirer deleted the article). I agree that 500W is pushing it a bit, but he used the PSU for a year already and it is still very stable in terms of voltage through testing.

So when Nvidia recommends 600W, that number should be treated seriously. If you have a good quality 600W, then there is absolutely nothing to worry about. There is no need to get a 700+ system, contrary to the hysterical opinions you get (which is what that test was done to disprove).

Redeemed
12-08-07, 11:31 PM
That guy stress tested his system, a quad core (intel) with 2 OCed 8800GTX, I think he used water cooled GTX too, they were OCed a lot.

In the end the system didn't use up 450W at peak or something like that (Inquirer deleted the article). I agree that 500W is pushing it a bit, but he used the PSU for a year already and it is still very stable in terms of voltage through testing.

So when Nvidia recommends 600W, that number should be treated seriously. If you have a good quality 600W, then there is absolutely nothing to worry about. There is no need to get a 700+ system, contrary to the hysterical opinions you get (which is what that test was done to disprove).

First of all, you're taking anything from the Inquirer seriously? :wtf: Are you off your rocker, man? :lol:

Secondly, only the best of 500watt PSU can handle the setup you mention. You fail to make note of that. Any "generic" 500watt PSU will fry.

As has been stated you need atleast a good, reliable 600watt PSU alteast for GTX SLi. If you get less, and your rig ends up in a puff of smoke 6 months down the line, don't get upset when we all laugh at you...

mythy
12-09-07, 12:08 AM
yes a 500W can run 2 GTX's a quad ect. Systems don't really use as much power as people believe. With that said most PSU's don't put out as much as there rated and the ones that do are likly to die running at full load after a week :p Simply put for SLI people need a Good 650W or up. If you can get a GREAT 500-550W then it will run but your pushing it. A PC turbo cool 510 for instance would work.