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Old 10-28-06, 12:51 AM   #361
agentkay
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Default Re: GeForce 8800 GTX is selling?

FYI, the Sharkoon Silentstorm 120 700W is based on the same design as the OCZ GameXstream 700W, but a little cheaper over here ($40 less). Here is a nice review of both: http://www.madshrimps.be/?action=getarticle&articID=492

Hopefully thats enough to drive a single 8800GTX with an OCed C2D E6600.

BTW, its too bad that both PSUs don´t have a quick connect panel.
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Old 10-28-06, 01:11 AM   #362
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by Xion X2
"600W: +3.3V(28A),
+5V(46A), +12V1(20A), +12V2(18A)"



That's unfortunate, because now I'd put you in the same boat as mike686. Might want to look into a new PSU.
Perhaps you are not the be all end all expert on G80 PSU compatibility.... I find it VERY hard to believe that this will not run a G80, I find it equally hard to believe a TPII-550 won't run a G80. Say what you will, I'm quite certain there won't be a problem.
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Old 10-28-06, 01:28 AM   #363
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by sillyeagle
Perhaps you are not the be all end all expert on G80 PSU compatibility.... I find it VERY hard to believe that this will not run a G80, I find it equally hard to believe a TPII-550 won't run a G80. Say what you will, I'm quite certain there won't be a problem.

don't worry, it will run it fine.
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Old 10-28-06, 02:18 AM   #364
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by sillyeagle
Perhaps you are not the be all end all expert on G80 PSU compatibility.... I find it VERY hard to believe that this will not run a G80, I find it equally hard to believe a TPII-550 won't run a G80. Say what you will, I'm quite certain there won't be a problem.
I never said I was the "be all end all," smart-ass. You can choose whether or not to believe me; I'm just laying out the facts for you. And the fact is that dual-rail PSU's are becoming less and less common because they are a bottleneck for current and future high-end graphics cards.

Look at it like this:

You have a dual-rail PSU with 19A on each rail. Well, that's all great and you're thinking "HA! I'm set! 38A to run my computer off of." Wrong. 19A of that will go strictly to your processor, because it has to have its own dedicated rail.

So let's consider the amp distribution in Average Joe's computer and see if the #'s add up.

1) Your hard drive(s). 1 HDD ~2A

2) Your optical drive(s). 2 drives ~3A

3) Your motherboard/memory. ~2-3A

4) Your case fan(s). 2-3 fans ~ 2A

5) Your sound card. ~ 2A

Total amps available on 12v2: 19A
Total amps used in this equation: 12
Total amps left for graphics: 7

That's barely enough to run a 7900GTX off of, and explains the reason why I've seen my system fail before with the Antec Truepower II 550W when I had a couple of extra drives in my computer. It has two rails running at 19A/apiece, but I can only use one of those since the first is dedicated solely to the processor. When I ran two hard-drives in this machine, every one of my case fans would slow down under full-load and I would get lower scores in benchmarks. And the reason it did so is because the flimsy 19A rail was strangling it.

And I'll say it again. Considering the 8800GTX draws a hell of a lot more power than a 7900GTX, there shouldn't even be a question of whether or not you're taking a serious risk trying to run a power-hungry monster like this on a PSU that will barely handle today's high-end cards.

It's not rocket science, guys, but it does take a little bit of research on your part. I'd suggest you do some, or don't come crying to me if you get system crashes and lockups left and right. Your systems may turn out fine; I'm not saying they won't. But I do believe you're taking a risk if you try to run an 8800GTX off a dual-rail power-supply. The #'s just do not add up. And if you misconstrue nVidia's "450W" recommendation and start to think that wattage is the only thing that matters in the equation, then you're going to regret it. I'll link you to a forum right here to a bunch of pros that will tell you that amp draw is every bit as important, if not more:

http://www.xtremesystems.org/forums/...d.php?t=105535

There are a lot of guys over there where I frequent who write professionally for PC-tech magazines, have their own shops and design custom water-cooling parts with their names slapped on them. So you could say they know what they're talking about most of the time.

If I were you, and I was spending 600+$ on a graphics card, I would make damn sure it was getting the right amount of power such as not to damage it. And it's going to have a hard time getting that power on a single 12v rail with only 18-20A sitting on it. You'd be much better off going with a strong single-rail PSU like the Silverstone Zeus ST56ZF that has 38A on a single rail, or something like Redeemed or I have which has two extra 18A rails that are dedicated to nothing but graphics.
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Last edited by Xion X2; 10-28-06 at 02:44 AM.
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Old 10-28-06, 02:59 AM   #365
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Default Re: GeForce 8800 GTX is selling?

I wonder if the Enermax Liberty 620W PSU will be enough for the 8800GTX

It is dual rail, 22A on each 12v rail

Is it sharing all the 44A for the whole computer, or 22A for CPU only, and 22A for the graphic card and the rest


Also I wonder what each rail is respobsible for

3.3v/5v - mb, memory, pci, agp, what else?

12v - hd, dvd, fans, graphic card, what else?


Do you think the next generations of graphic cards will require more amps or less amps? I assume they will require less wattage, so is it safe to assume less amps as well?

Thanks.
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Old 10-28-06, 03:13 AM   #366
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Default Re: GeForce 8800 GTX is selling?

zero--If I were you, I wouldn't go with a dual-rail PSU. I wouldn't recommend them to anybody right now, because one of those rails is dedicated to the processor only, leaving you with only 22A to run the rest of your system off of.

You can get a good quad-rail power-supply for a pretty good price if you go with an OCZ GameXstream like Redeemed has. His has 700W and 4 12v rails at 18A apiece w/ two of those dedicated to just graphics. They are selling those on newegg right now for 115$. That would be plenty to run a G80 off of--even serious overkill if you were just going with a single card.

The problem with dual-rail PSU's is the processor always takes up a rail by itself, leaving you with only half the advertised amps to run your system off of. I would stay away from them.

Something that I want to clarify is you are right. I forgot that the motherboard/PCI-E lanes actually run off the 3.3/5v. These rails aren't used nearly as much as they used to be; most everything runs off your 12v rail(s) these days.

But that still doesn't leave enough amps on the dual-rail PSU's, IMO.

As far as the next generation of cards, who knows. nVidia is working on 65nm as we speak, so that should cut power-usage and temps way down, but what happens when the next technological leap comes along and increases transistor count again? Will power-usage go back up again? I don't think any of us can say for certain at this point what will happen; the best thing you could do is go with a PSU that exceeds recommendations by a significant margin in order to give yourself a buffer for the future and to futureproof your machine. May as well since you're spending that money in the first place.

Are you in the market for a new PSU? If you are, let me know what your price range is and I'll try to recommend a good one for you.
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Old 10-28-06, 03:18 AM   #367
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Default Re: GeForce 8800 GTX is selling?

Thanks for the info guys, Xion X2 especially. That Silverstone looks awesome. So do you think for sure that thing will be able to run a 8800GTX flawlessly?
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Old 10-28-06, 06:06 AM   #368
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by mike686
Thanks for the info guys, Xion X2 especially. That Silverstone looks awesome. So do you think for sure that thing will be able to run a 8800GTX flawlessly?
Um, which Silverstone?
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Old 10-28-06, 06:25 AM   #369
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Default Re: GeForce 8800 GTX is selling?

Here is a noob-question regarding PSUs. When I´d purchase a 1000w PSU but only use 600w with my components, do I actually waste energy or won´t my electricity bill any higher if I had used a 650w PSU instead in the first place? (My PC runs a lot, not 24/7 but 14/7 because of work and my games addicition, so I do like to keep an eye on the e-bill.)

If a 1000w PSU doesn´t increase my e-bill anyway (unless I have components that use up almost 1000w which seems logical to me), it would be actually smarter and cheaper (to me) to purchase a higher amp/wattage PSU to be on the safe side for the next upgrade in a year or two towards a quadcore CPU and 65nm highend GPU, wouldn´t it?

And yes you are allowed to laugh at my lack of knowledge in this field.
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Old 10-28-06, 06:55 AM   #370
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by agentkay
Here is a noob-question regarding PSUs. When I´d purchase a 1000w PSU but only use 600w with my components, do I actually waste energy or won´t my electricity bill any higher if I had used a 650w PSU instead in the first place? (My PC runs a lot, not 24/7 but 14/7 because of work and my games addicition, so I do like to keep an eye on the e-bill.)

If a 1000w PSU doesn´t increase my e-bill anyway (unless I have components that use up almost 1000w which seems logical to me), it would be actually smarter and cheaper (to me) to purchase a higher amp/wattage PSU to be on the safe side for the next upgrade in a year or two towards a quadcore CPU and 65nm highend GPU, wouldn´t it?

And yes you are allowed to laugh at my lack of knowledge in this field.
If I'm understanding your post correctly, then I'd say you answered your own question correctly.
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Old 10-28-06, 06:58 AM   #371
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Default Re: GeForce 8800 GTX is selling?

Thanks!
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Old 10-28-06, 08:21 AM   #372
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by agentkay
Here is a noob-question regarding PSUs. When I´d purchase a 1000w PSU but only use 600w with my components, do I actually waste energy or won´t my electricity bill any higher if I had used a 650w PSU instead in the first place? (My PC runs a lot, not 24/7 but 14/7 because of work and my games addicition, so I do like to keep an eye on the e-bill.)

If a 1000w PSU doesn´t increase my e-bill anyway (unless I have components that use up almost 1000w which seems logical to me), it would be actually smarter and cheaper (to me) to purchase a higher amp/wattage PSU to be on the safe side for the next upgrade in a year or two towards a quadcore CPU and 65nm highend GPU, wouldn´t it?

And yes you are allowed to laugh at my lack of knowledge in this field.
The thing with using a 1kw PSU to power 600w is that its not as efficient as a 650w would be for that same system. PSUs are designed to be their most efficient at their max sustained power draw. But I don't think the efficiency difference @ 600w is going to be too much, as long as you have a quality PSU. Personally, I go for higher power PSUs, just to be safe.
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