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Old 11-01-06, 08:36 PM   #481
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by mike686
So what PSUs are absolutely guaranteed to run 2 GTX's?
http://www.pcpower.com/products/view...hp?show=T1KWSR This is what I will be getting if my OCZ 700W GameXStream with a FSP X3 booster doesn't work, but I think I'll be ok
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Old 11-01-06, 08:44 PM   #482
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by lee63
http://www.pcpower.com/products/view...hp?show=T1KWSR This is what I will be getting if my OCZ 700W GameXStream with a FSP X3 booster doesn't work, but I think I'll be ok
72A!

I was seriously considering the PCP&C Silencer 750 for $350 less, do you think that would be pushing it? It does 60A on the single 12V rail.

Amazing how that extra 12A costs $350.
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Old 11-01-06, 09:07 PM   #483
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by ArrowMk84
Should I have to go SLI, my PSU should get the job done. It's got a 60 amp 12v line, and making the worst case assumption that a single GTX draws 225w, that's only 18.75 amp per card (37.5 for the pair). But I also have 2 optical drives, 2 HDs, and five case fans running on 12v as well, so it might be close.
I think you're fine, Arrow. I almost went with your PSU but I needed a little extra wattage for my H20 setup. My pump alone takes 50W.
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Old 11-01-06, 09:09 PM   #484
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Default Re: GeForce 8800 GTX is selling?

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Originally Posted by mike686
So what PSUs are absolutely guaranteed to run 2 GTX's?
Silverstone ST85ZF, PCPower & Cooling 850W/1000W, Enermax Galaxy 850W/1000W, PCPower & Cooling Silencer 750W, Zippy 850W.
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Old 11-01-06, 09:12 PM   #485
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Default Re: GeForce 8800 GTX is selling?

I'm only going for 1 GTX...You guys think I will be ok with my Enermax 535 (2 x 16A 12 Volt Rails = 36A)?
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Old 11-01-06, 09:14 PM   #486
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Default Re: GeForce 8800 GTX is selling?

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Originally Posted by nrdstrm
I'm only going for 1 GTX...You guys think I will be ok with my Enermax 535 (2 x 16A 12 Volt Rails = 36A)?
Questionable, because of the dual-rail architecture. You can try it, but first sign of problems I would upgrade.

As I mentioned before, the problem with dual-rail PSU's is the processor hogs all the amps on the first rail, normally--leaving the rest of the system to share only half the advertised amps.
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Old 11-01-06, 09:38 PM   #487
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by Xion X2
Silverstone ST85ZF, PCPower & Cooling 850W/1000W, Enermax Galaxy 850W/1000W, PCPower & Cooling Silencer 750W, Zippy 850W.
edit: Nevermind, I'll just stick with one GTX and if all goes well I'll pick another one up.
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Old 11-02-06, 12:09 AM   #488
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by Xion X2
Unless you typed the wrong model #, your specs are off. These are the specs from Thermaltake's site for the W0049:
~~~~~~+5V +3.3V+12V1 +12V2 +12V3 -12V +5VSB
Max. Load 30A , 28A , 14A ,, 23A , 15A , 0.5A , 2.5A
Min. Load 0.5A , 0.8A, 1A ,,,, 1A ,,,, 1A ,, 0.0A , 0.1A
http://www.thermaltakeusa.com/produc...0049/w0049.asp
So you have a total of 52A on the 12v rail. If you plug in both PCI-E connectors into the GTX, you should be okay I would think.
You might want to contact Thermaltake and ask them what the 12v rail distribution is on that power-supply, and which rail runs off what PCI-E connectors.
Thanks. I'll contact Thermatake about the 12V rail distribution.
This is the advertised amperage for the Thermaltake Pure Power 680W W0049, on the website:


And this is a real picture from my own PSU. (compare the 5V, 12V2 and 12V3 rails)

I bought my PSU on April 2005. Maybe they released a new revision with higher amps on the 12V rails, and lower amps on the 5V rail. I don't know.
According to the sticker on my PSU, I only have a total of (15A+15A+8A)=38A on the 12V rail. Considering these lower-than-advertised amps on the 12V rail, you think it will be enough to power a single 8800GTX?
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Old 11-02-06, 02:00 AM   #489
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Default Re: GeForce 8800 GTX is selling?

Ok, I found some info @ http://www.xbitlabs.com about the Thermaltake PurePower 680W W0049. . There is a crappy Rev.1 (mine) and a good Rev.2. Here is the short-story version:
Quote:
The Rev.1 PSU has two independent +12V regulators:
* the main regulator has +12V1 rail @15A;
* the additional regulator has +12V2 rail @15A and +12V3 rail @8A (these are separated “virtually”), with a combined current of up to 23A. This regulator works by itself and doesn’t depend on how the other power rails are loaded.

It’s interesting to know what connectors each is responsible for, so, I opened the PSU and found the following:
* The mainboard, graphics card, SATA and some PATA power connectors are connected to the +12V1 line (the main regulator)
* The CPU power connector is connected to the +12V2 line (the additional regulator)
* Two cables with Molex connectors for PATA drives are connected to the +12V3 line (the additional regulator, again). There are four such cables in the PSU, and those of them that also have a mini-plug for the floppy drive are connected to the +12V3.
Quote:
They just adapted an old high-power (+5V rail @50A) server-oriented PSU to today’s ATX12V and EPS version 2.0 standard, and that ended in a total failure.

The first-revision W0049 model is not just a poor product. It is practically unfit for work and is not worth even half its price. The attempt to modernize an old power supply by putting an additional regulator into it only created more problems, partially coming from the section of the PSU that was left unchanged (hence the low stability of the +12V1 line – its load capacity didn’t matter much at those times when computers were mostly powered from the +5V source) and partially from the imperfections of the new additional regulator (hence the very high voltage ripple on the +12V2 and +12V3 lines). If you want to buy a W0049, I strongly recommend that you buy its second revision (discussed in the next section of this review). If you’ve already bought the first revision and encountered all the problems entioned above, you should follow my advice and power the graphics card through an adapter from a Molex connector on the cable that belongs to the 12V3 line (choose one of the cables with floppy mini-plugs on their ends).
Hmmm... This means plugging in both PCI-E power connectors connectors into the 8800GTX will not work.
My only option is try to power the 8800GTX using (Two molexes to y-adapter + Two molexes to y-adapter).
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Old 11-02-06, 04:26 AM   #490
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Default Re: GeForce 8800 GTX is selling?

Does a single 8800GTX sucks more power than 2x 7900GTX in SLI ?
Because I've just tried 2x 7900GTX SLI in my PC, using adapters from the Molex connectors, and it worked.
7900GTX GPU1: Two molexes to y-adapter.
7900GTX GPU2: Two molexes to y-adapter.
I ran 3Dmark06 in loop to stress the PSU, and the PSU didn't shut down automatically. It was ok.
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Old 11-02-06, 11:11 AM   #491
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Default Re: GeForce 8800 GTX is selling?

^ What was your score on 3dmark? A friend of mine actually had the Rev.2 model of your PSU and got 1,000 points lower on 3dMark05 than he did with his current Silverstone ST56ZF. And he was only running a single 1900XT.

And beware of this "ripple" they talk about in your quote from xbitlabs. A ripple, if bad enough, can damage components in your computer. Mainly your RAM.
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Old 11-02-06, 01:53 PM   #492
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by Xion X2
^ What was your score on 3dmark? A friend of mine actually had the Rev.2 model of your PSU and got 1,000 points lower on 3dMark05 than he did with his current Silverstone ST56ZF. And he was only running a single 1900XT.

And beware of this "ripple" they talk about in your quote from xbitlabs. A ripple, if bad enough, can damage components in your computer. Mainly your RAM.
I didn't run the 3Dmark06 full benchmark, with cpu test and so on. I just ran the graphic tests (SM2.0 and SM3.0) in loop for like 20 min. No score.
The 2x the 7900GTX are not here anymore. They were not mine. I borrowed them from a friend just for this PSU stress-test.
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