antec power supply tester- does it only test to see if the ps is dead?

[BBY125]

I'm considering buying a antec power supply tester but I would like to know if it is only used to determine if a power supply is dead? or can it determine if a power supply is dying or not performing well?

my computer starts up fine and stuff, just reboots whenever I open a game(never happened before)

 

[BBY125]

maybe this might help, my voltage readings say

+12v is 11.491
+5v is 4.999
+3.3v is 3.456
vcore is 2.048
-5v is 5.128
-12v is 11.698

comp specs:
p3-450mhz
128mb pc100 ram
30gb 7200rpm IBM hd
ATI wonder TV VE
linksys 10/100 network card
diamond viper2 32mb 3d card
plextor 16x cdr
sb live value
2x80mm case fans
250w generic power supply that came with case

 

[FatBurger]

What are you using to measure that? If it's software, it'll need to be an accurate program. Asus Probe for one is known not to be.

Your 12v line is rather low, that's very possibly the issue.

 

[BBY125]

yeah, I'm using asus probe, know of any good accurate programs ?

 

[fast_eddie]

To answer your initial question about the Antec PS tester - YES. It would do nothing to help you evaluate the condition of your PS.
If you are serious about measuring your PS voltages with a DMM (digital multi meter) drop me a PM; I can 'hook' you up with an ATX cable set to connect up a DMM easily.