My sincere apologies to the wing/mem/women/persons to my i7/930 machine, which has been down with a severe case of PSU failure for the last two days. Not sure when it will back crunching again.

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I don't buy computers, I build them!!

Thanks for the update Cliff.
Hope to see your i7/930 machine back soon ! :)

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I have secured a lower powered PSU (750 watt) until the replacement (1200 watt) arrives. It doesn't look like any of the work units in the queue were affected as the earliest deadline is 23 August.

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I don't buy computers, I build them!!

Just a sugestion, crunch in less cores and run only 1 WU at a time on your GPU, that will save a lot of watts and protect your 750W PSU until your new 1200 PSU arrives.

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Just a sugestion, crunch in less cores and run only 1 WU at a time on your GPU, that will save a lot of watts and protect your 750W PSU until your new 1200 PSU arrives.

Should not be a problem. Could easily run with this PSU in current configuration, since the GTX460SE / 1Gb / 2 x Cuda_42 requires a minimum of 450 watts. This machine is for crunching only, with the minimum of external/internal hardware/software attached/installed. Internet browsing used only when the primary machine is down. Only programs installed are those necessary to monitor the machine and lan printer.

Found out what caused the PSU to fail, a millipede was found entwined in the innards which shorted it out. PSU still under warranty.

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I don't buy computers, I build them!!

Should not be a problem. Could easily run with this PSU in current configuration, since the GTX460SE / 1Gb / 2 x Cuda_42 requires a minimum of 450 watts.

I was thinking you where talking about your 2x660 host, my mistake, a 750W PSU have enought power to drive a single GPU host without problem.

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Found out what caused the PSU to fail, a millipede was found entwined in the innards which shorted it out. PSU still under warranty.

Reminds one of the first computer bug
http://www.history.navy.mil/photos/images/h96000/h96566k.jpg

Should not be a problem. Could easily run with this PSU in current configuration, since the GTX460SE / 1Gb / 2 x Cuda_42 requires a minimum of 450 watts.

I was thinking you where talking about your 2x660 host, my mistake, a 750W PSU have enought power to drive a single GPU host without problem.

Even though my GTX660s requires the same minimums, I would not run both on a 750 watt PSU. I would run only one, but keep it at its current config of 2 APs or 4 Cuda_50 when no AP units are available.

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I don't buy computers, I build them!!

Should not be a problem. Could easily run with this PSU in current configuration, since the GTX460SE / 1Gb / 2 x Cuda_42 requires a minimum of 450 watts.

I was thinking you where talking about your 2x660 host, my mistake, a 750W PSU have enought power to drive a single GPU host without problem.

Even though my GTX660s requires the same minimums, I would not run both on a 750 watt PSU. I would run only one, but keep it at its current config of 2 APs or 4 Cuda_50 when no AP units are available.

I'm not trying to get you to change your mind, but I've been running two 560Tis in two computers since the 560Ti was introduced with 750w PSUs, and I have two 660Ti's on a 750w and I have two other 660Tis on a 800w. No problem.

I do go to 950w when I'm running three cards.

Yes, over the life of SETI crunching since the GTX 460s were born, I have lost two power supplies: One 750 running two 560tis which was repaired under warranty (cold solder joints) and most recently a 950w running three 560s. I don't know what's wrong with that one, yet.

My impression is that you don't need a kilowatt of power to run a couple of 140w video cards. Yes, as you overclock GPUs the power requirement rises quickly and drastically, but even if it went to 200w that would leave 350w to run a power supply, fans, motherboard and CPU. If the cards are drawing something like 175w each, that's still 400w for the rest of the system. Sure, I'm aware of "turn-on" spikes so you buy a good PSU when you buy one.

And of course I'm assuming that if you are double-clocking your cards with custom heat dissipation solutions and have a 26 Core i7 with HT running at 100% in a 90F room with 32" fans running at 6,000 rpm and a 10 HDD Raid Array that you know what you are doing and I'm not talking to that audience. But for most of us a kilowatt is more power than we'll ever draw.

YES I am aware of spikes and noise and slew-rates for those who want to argue the finer points.

I'm just reporting: A good 750w power supply is plenty to run two mid-range video cards and a mid-range motherboard/CPU combo and some fans and a few LEDs and a couple of hard drives 24/7, 365, for years.

Should not be a problem. Could easily run with this PSU in current configuration, since the GTX460SE / 1Gb / 2 x Cuda_42 requires a minimum of 450 watts.

I was thinking you where talking about your 2x660 host, my mistake, a 750W PSU have enought power to drive a single GPU host without problem.

Even though my GTX660s requires the same minimums, I would not run both on a 750 watt PSU. I would run only one, but keep it at its current config of 2 APs or 4 Cuda_50 when no AP units are available.

I'm not trying to get you to change your mind, but I've been running two 560Tis in two computers since the 560Ti was introduced with 750w PSUs, and I have two 660Ti's on a 750w and I have two other 660Tis on a 800w. No problem.

I do go to 950w when I'm running three cards.

Yes, over the life of SETI crunching since the GTX 460s were born, I have lost two power supplies: One 750 running two 560tis which was repaired under warranty (cold solder joints) and most recently a 950w running three 560s. I don't know what's wrong with that one, yet.

My impression is that you don't need a kilowatt of power to run a couple of 140w video cards. Yes, as you overclock GPUs the power requirement rises quickly and drastically, but even if it went to 200w that would leave 350w to run a power supply, fans, motherboard and CPU. If the cards are drawing something like 175w each, that's still 400w for the rest of the system. Sure, I'm aware of "turn-on" spikes so you buy a good PSU when you buy one.

And of course I'm assuming that if you are double-clocking your cards with custom heat dissipation solutions and have a 26 Core i7 with HT running at 100% in a 90F room with 32" fans running at 6,000 rpm and a 10 HDD Raid Array that you know what you are doing and I'm not talking to that audience. But for most of us a kilowatt is more power than we'll ever draw.

YES I am aware of spikes and noise and slew-rates for those who want to argue the finer points.

I'm just reporting: A good 750w power supply is plenty to run two mid-range video cards and a mid-range motherboard/CPU combo and some fans and a few LEDs and a couple of hard drives 24/7, 365, for years.

No problem. I've been asked the same question by many Setizens over the years on why I have so much power for a system that does not need that much. I'm an old head who believes in the old American philosophy of the more the better. I believe in having the biggest & best PSU that I can afford. When ever I have the finances to upgrade to bigger and better equipment the only thing that I don't have to worry about is the PSU. One of these days I WILL win the big one and I can afford to max out all of my components and the only thing I will have to worry about is to add an additional 1200 watter to even things out power wise, don't want to have one unit shouldering all of the load. If that happens, I won't worry about the electric bills.

The i7/950 has always run with 2 cards starting with a GTX275/GTS250 card and a GTS250 card, slowly working up to the current GTX660SC. The i7/930 machine always ran with 2 cards also until recently when both the GTX275/GTS250 and the GTS250 cards started giving me problems, so when I got my 2nd 660 I retired them both and replaced them the GTX460SC. It does the same work (2 x Cuda_42) as the 2 older cards (1 x Cuda_32) in a shorter amount of time.

My current dream machine is the i7/4770K (water cooled), 2 x Titan GPU (water cooled), 2 x Samsung 840 Pro SSDs (1 x 128Gb, 1 x 256Gb), etc. Since I don't trust myself in putting together a water cooled system, I'll probably go against my own motto and have OriginPC.com build it. Every thing but the PSU. I'll replace the one from the 930 machine with the 750 watt and give it to my stepson and put the 1200 watt in the new machine, but I might have to upgrade it to a bigger unit.

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I don't buy computers, I build them!!