My computer is lagging and 3Dmark05 score is decreasing half [from 7300 to 4300] and CPU score dropped from 12000 to 2200.

So I set my BIOS to default setting.

Speedfan voltage for +12V is 00.00 and -12V is 16.90

Are those normal voltage and what is wrong with my comp?

Thanks

no

your 12v is dead but if it was then you have no fans?


the -12 is ok

Well, those numbers are totally confusing.

+12v nominal = 0.00V
-12V nominal = +16.90V

that means you are SO broken. I would ASSUME that the 16.90V is really -16.90V? If you are either +16.90 or -16.90V and that really is accurate, you need a new power supply NOW. I think the tolerance is supposed to be +-10% for the 12V rail.

I'm not sure what Speedfan is, but if those numbers are really correct, you need a new PSU now. I wouldn't use the computer till you replace it. Last thing you need is the 16v to burn out all your components, assuming you haven't damaged anything already.

As a last resort use a voltmeter to check the voltages while your computer is on or a PSU tester.

My initial thoughts are the numbers are for real, and your bad scores are a result of the jacked up voltages. When my computer is broke, it's usually just 1 problem. So the odds of having a bad PSU as well as bad benchmarks being the result of something else are slim to none IMO.

to cyberjock, yes, it is actually -16.9V [as I forgot putting minus sign before the number]

+12V= 0
-12V=-16.9

I have 2 fans of 12cm and 4 fans of 8cm.

So for all the conclusion, my PSU is broken?

Sorry for the long delay in the reply. Get yourself a new power supply. I'd bet money that's your problem. PM me if you have any other problems or get it working.

Good Luck.

Chief, I have those exact same readings via speedfan for my psu. I haven't noticed any lag, power, fan problems though. Are we certain it's broke?

Yeah some board just has broken voltage report like that. Mine too, but not too outrageous like that. You should use a vol meter to double check those voltages.

Speedfan reads my 12v at 9.77, my bios reads it at 12.19. Check your bios.

hmm, 12.19, a little high there, my 12v is 11.98-12.04.

On topic, as others have said check your bios direct, also make sure the 3.3 and 5 are stable.

I've noticed a number of posts that indicate a problem with speed fan on reporting voltages. It appears that it is looking at a incorrect address and when it gets an invalid Nr, it reports it's rail limits, ie 0 for min and a very high valule for the upper.

If the computer boots, and is normal - IGNORE them.
as Several have pointed out, use the bios, better yet if you have a voltmeter, use it (always better than software interrupted)

Most PSU's have a tollerance of Plus/minus 3%

My system, speedfan reports:
+12V is 1.28V
-12 V is -16.97
Remainer (Vcore 1 and 2, +3.3, Both +5 abd VBat appear corect.

Just as a quick sidenote. I believe the -12V rail isn't actually used anymore. It was for some components that haven't been used since the 386 days, so there's no load on the 12v rail. That does cause totally erratic voltages because there is no load on the system. My computer was really at -16v on the -12v bus. I was somewhat unhappy as I had just built the system. I learned after some research that the -12v can be ignored completely as nothing has used that bus for 10+ years. It's only around still for compatibility because it was part of the AT standard, which was implemented into ATX.

Cyberjock
Ref neg 12V, I beleive I also read that someweres. And Yes I think you'll find on most switching P/S a minimum load ( I think 100/200 milliamps is specified. Back in the 8086/286 days individuals would power on the computer with no load on the PSU and bingo blown psu