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Ampere output not enough for the GPU

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Last response: in Systems
August 17, 2009 7:29:21 AM

Hello again :) 

As the topic says, I wonder if the system can cause a reboot if the GPU ain't getting enough Ampere from the PSU.

I made a mistake and bought a PSU producing less than 30A and a GPU consuming 36A.

I have rebooting problems sometimes, and it just happens. Ramvoltage setted.

Thanks alot :) 


More about : ampere output gpu

August 17, 2009 7:55:37 AM

What are your system specs? What PSU?
August 17, 2009 8:27:24 AM

p5q3 MB
LGA775 Quad 2.66
600w Xilence PSU
2x2Gb RAM

Also another question, it seems like I am not using my GPU fully, like if there's a limiter or something, causing my GPU to only use 50% of it's capacity, is there any known thing causing this?
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a b B Homebuilt system
August 17, 2009 1:27:11 PM

The problem is not so much that it is not powerful enough, the problem is that it is a cheap no-name brand piece of junk. Sorry, but that is the bottom line here.
And yes, this PSU could potentially cause all sorts of problems. Random reboots, slow GPU performance are just two of the many problems you may experience, and it could end up killing other parts in your system.
Be smart, start your build with a quality brand name PSU.
August 18, 2009 7:00:03 PM

I bought a new one yesterday, 800W, with up to 64A output. The brand is called Tagan, tho I havn't heard about it before, but they guaranteed it's a good one and that it Might solve the problem. and it did, for a few houres till I got another Reboot. Now I am pretty sure it's something else, could it be a setting in BIOS?
a b B Homebuilt system
August 18, 2009 7:12:19 PM

Sounds like a possible overheating problem. What are your idle/load CPU/GPU temps?
August 18, 2009 9:32:47 PM

Either my MB or CPU uses to be over 40Degrees(mostly 35) each time I check in BIOS, Is there any program I can check the current Temp with while in Windows?
a b B Homebuilt system
August 18, 2009 9:43:41 PM

Speedfan, Coretemp, and Realtemp will all display your temps. I would use Prime95 to heat up the CPU while monitoring the temps.
August 19, 2009 11:06:07 AM

As I wondered about this problem last night, I remembered that the in stallation of the OS occured a problem, the Comp Froze just a few minutes before it was all completed, maybe this is the cause of my reboots? Some file wasn't installed correctly? Maybe a new clean copy on the HDD of XP may solve it?

The freeze during the installation might have been caused by too low Voltage on the RAMS, but as it's set now, a complete, finished reinstall sounds possible to be a solvement :) 

What do you think?

Also Linking a Screenshot in next message of the Temps
August 19, 2009 11:23:22 AM

Took a Screenshot, uploaded and here it is( not the best quality, although it's readable and understandable )

Maybe a new CPU (775) Cooler is a purchase today already?
August 19, 2009 1:39:28 PM

After some more monitoring temperatures, it has reached 60Degrees Celsius as max now. The chassis stays cool all the time, maybe another Cooler or more grease on my current one? Every opinion is welcome :) 
a b B Homebuilt system
August 19, 2009 3:42:17 PM

60C max is just fine for your CPU.
August 19, 2009 4:19:07 PM

What could the Rebooting be caused by then? Do you think it could be the "half-failed" Formatting the first time?
a b B Homebuilt system
August 19, 2009 5:26:32 PM

You said you set the RAM voltage, but did you also manually set the RAM speed/timings to the manufacturer's specs in the BIOS? Have you run Memtest86+ overnight to test for RAM errors?
August 19, 2009 6:42:51 PM

I manually set the RAM voltage to now 1.64V, and the Speed TImings is left on default tho. No, I have not run Memtest86+, but I can do that this evening, also with both Prime95 and CPuID at the same time :) 

I think I will reformat the OS too, just to make sure it's not the problem:) 
a b B Homebuilt system
August 19, 2009 7:31:23 PM

What RAM kit do you have? 1.65v is usually the voltage of the triple channel kits for the i7 chips. I wouldn't be surprised if your RAM needs more than 1.65v to be completely stable.
August 19, 2009 8:09:04 PM

I am using a Corsair 2x2Gb Kit DDR3 - art nr. TW3X4G1333C9
August 19, 2009 8:42:45 PM

I am now running the Speed 1333MHz and 1.66V on DRAM, It shouldn't be needed with 1.7V?
a b B Homebuilt system
August 19, 2009 8:45:54 PM

The RAM is rated at DDR3 1333 with 9-9-9-24 timings at 1.6v. That's what it should be set to in the BIOS.
August 19, 2009 8:49:58 PM

I have now Rebooted and manually reset the Voltage to 1.6V and the Speed is set to 1333MHz. The timing is 9-9-9-24-?-?-?-?. There are four other numbers which i cant remember. There are also two additional Timing lines, although I didn't wrote the numbers down.

Is there any other thing I should do to make sure it will run correctly?
a b B Homebuilt system
August 19, 2009 8:53:48 PM

I would run Memtest86+ overnight now that you have the RAM values set correctly. The rest of the RAM timings can just be left on auto settings. The most important ones are the first four.
August 19, 2009 9:02:42 PM

Thanks for helping me with the settings

Now for the Memtest86+, I can run it over night(and just hope for it to not freeze meanwhile), Do I need to burn it on a CD and bott up with it?
a b B Homebuilt system
August 19, 2009 9:05:53 PM

Yes, you have a few different options for running Memtest86+. You can either burn it to a CD, thumb drive, or floppy disk. You then boot from it and it runs outside of Windows.
August 19, 2009 9:09:24 PM

Is there anyway I could run it by copying a bootable file to an USBdisk or something? I have my burning drive currently installed in another computer located at another adress
a b B Homebuilt system
August 19, 2009 9:21:39 PM

You can use a USB thumb drive. You just to to and click on the "Download (Pre-built & ISOs)" link. You then have a few different options. One option is "Download - Pre-Compiled EXE file for USB Key (Pure DOS)". That is for a thumb drive.
August 19, 2009 9:55:45 PM

Do I need to fix any Bootdevicepriority for booting up with the USB stick? and Do I need to clean the entire stick before?
a b B Homebuilt system
August 19, 2009 9:59:34 PM

Yes, you'll need to update the boot priority to get it to work. I can't remember if you have to delete everything else off the stick or not. It's been a while since I used a thumb drive for Memtest.
August 19, 2009 10:08:01 PM

Something says me I change the devicepriority in BIOS, what is it called?
August 19, 2009 10:35:36 PM

So, I have putted the memtest86+.exe on the stick and set the bootdevicepriority to the USB stick, although it wont boot with the stick, any idead? :)  thanks