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What happens if my PSU is capped, and how to determine if it is


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#1 Toeler

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Posted 21 April 2009 - 07:46 AM

Alright, so I am running a fairly beefy PC, that will get everything I need done for the next while, but I am having an extremely annoying problem that has been happening for problably the past 5 months or so. In this time I have gained no new hardware, and my PC would run just fine for the 8 or so months prior to this problem. The problem is that while I am doing things, my mouse will randomly switch off, and sometimes it will turn back on within 20 seconds or so, but sometimes I must unplug it and plug it back in for it to then connect 10-20 seconds later....just to find out it will turn off 2 minutes later. This problem can become really bad when I am in the middle of games and I lose all ability to do anything, forcing me to lose in some important situations. My mouse is a Logitech G9 Gaming Mouse and my computer specs are:

Vista 64bit Home Basic
Intel Core 2 Quad CPU Q6600 @ 2.40 GHz
4GB RAM
NVIDIA GeForce 8800 GT g92
1.5 TB HDD


I am also running Logitech G15 Keyboard and Razer Piranah headphones.

I was just wondering how large of a PSU I would need for this setup, and if my PSU was at full capacity whether this could be the cause for it switching off, because right now I am considering taking it back to the place I got it under its 1 yr warranty to get a new one, as I can't take this constant turning off much more.

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#2 dpunisher

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Posted 21 April 2009 - 11:41 AM

Figuring wattage, about 240 watts should cover you for your present setup. Absolute min of 20 amps on your 12V rail (preferably 30 amps min).

In reality, a proper 450watt PSU would suffice, assuming a proper 12V rail for the CPU and videocard. My personal rule of thumb, I like to figure total power requirements and have a PSU running at 1/2 to 2/3 of its rated output to output that power. My current setup pulls 320 watts fully loaded, and has a 550watt PSU with a 41 amp 12V rail.

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#3 Sunharrow

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Posted 21 April 2009 - 12:05 PM

You could test your PSU with a digital multimeter. I have a Craftsman that I puchased for $20 and it is a good one.

Personally, this sounds more like a driver issue than a power issue. I love Logitech but there are times when their drivers need serious work. Have you attempted to update or uninstall and reinstall your mouse drivers?

#4 Toeler

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Posted 21 April 2009 - 04:48 PM

You could test your PSU with a digital multimeter. I have a Craftsman that I puchased for $20 and it is a good one.

Personally, this sounds more like a driver issue than a power issue. I love Logitech but there are times when their drivers need serious work. Have you attempted to update or uninstall and reinstall your mouse drivers?


I will try and reinstall the mouse drivers and see if this causes the problems to persist.

#5 Toeler

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Posted 22 April 2009 - 06:54 PM

I installed Logitech SetPoint 5.1.0 but I still noticed the mouse turning off, thought it didn't seem to happen as much last night, there were time before where it wouldn't do it much.

#6 Sunharrow

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Posted 22 April 2009 - 09:10 PM

Do they have updated drivers? If so try them.

#7 Toeler

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Posted 22 April 2009 - 11:07 PM

Do they have updated drivers? If so try them.


Logitech Setpoint is the G9 drivers, and I have installed them.

#8 YHB318

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Posted 23 April 2009 - 07:09 AM

I would doubt that it's your Power Supply. I suppose it's possible, but there are a lot of other things that I would check first. Does the original mouse have the same problem? Can you test the G9 on another PC to rule it out? Is the BIOS on your motherboard up to date?

That being said, this PSU is a great option with 650W: http://www.newegg.com/Product/Product.aspx...N82E16817139005
It's only $5 more than it's little 550W brother.

#9 Toeler

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Posted 24 April 2009 - 01:06 AM

I would doubt that it's your Power Supply. I suppose it's possible, but there are a lot of other things that I would check first. Does the original mouse have the same problem? Can you test the G9 on another PC to rule it out? Is the BIOS on your motherboard up to date?

That being said, this PSU is a great option with 650W: http://www.newegg.com/Product/Product.aspx...N82E16817139005
It's only $5 more than it's little 550W brother.


Original Mouse? This is the only mouse that I have used in this computer. I've tested the G9 in both other USB slots and my other computer. The USB slot doesn't matter, and I still get the mouse turning off. I haven't extensively tested the mouse on the other computer because I don't personally use it (Nor can I for what I do), but I have tried unplugging the mouse out of my computer the moment it turns off, and plagging it into the other computer, where the mouse turns on immediately (If I unplug and plug back into my computer I have to wait 5+ seconds for it to turn back on).

#10 Sterling14

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Posted 24 April 2009 - 04:41 PM

Have you tried another mouse in your computer though? As stated above by others, I highly doubt it's your power supply, but what is the wattage on it, and how many amps on the +12V rail? Also, what brand is it?
"I think there is a world market for maybe five computers." - Thomas Watson, Chairman of IBM, 1943

#11 Sunharrow

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Posted 24 April 2009 - 04:58 PM

I'm just wondering if the mouse has gone "bad." I haven't heard of this too much but it does happen.

#12 Toeler

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Posted 28 April 2009 - 06:48 AM

I am starting to think the mouse is faulty now, I used another gaming mouse that I had sitting around and had no problems with it (except the middle click doesn't work :thumbsup:), I might just take it back and get it fixed or something, because the 1 year warranty is still current for a little longer.




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