Asus A8v deluxe 12V voltage output problem

Hi, all

I have a problem with 12V output and hope I can get some help from here.

I found the 12V output shown in asus probe is only 11.369V, however, in bios, it is shown to be 11.904v which seems normal to me.

When I oc to 250x9, I can finish running 3dmark03 and aquamark, however, I always get failed information when running prime95, which deeply frustrated me. I can pass the superpi in 1M, but always failed in 2M. When I play farcry, the system suddenly restart which give me impression that the system can not work stably under 250x9 and power supply is not enough.

When I decrease the fsb to 240, everything seems ok. No problems complained in prime95 for 2 hours running. I was also able to play far cry.

How can I stably oc at 250 or even high? Is that issue connected with power supply? I am thinking buy a antec neo 480 which is really expensive. Any advice is welcome.

Here is my system specification:
Asus A8V deluxe rev 2.0, bios 1009.007
Athlon 64 90um 3000+ oc@2160MHz
Kingmax 512M (2x256) PC4000 dual channel
ATI 9600XT
COOLMAX 400W (+3.3V@30A, +5V@40A, -5V@1A, +12V@18A, -12V@1A, [email protected])
Matrox 60G IDE hdd
Benq CDRW

Many thinks!

I'm inclined to blame the PSU indeed - you might want to look into something with a bit more juice on its rails

DaButcha is probably right, I had the same problems when I used the PSU that came with my case. (Aopen 400W)

When I upgraded the problems went away.
Most forums recommend 25-30 amps on the 12V rail for these cpu's.

Thanks for the information.

I need to borrow a digital voltage meter. It is too bad that mine can only show 3 integer number for voltage which is only 11V.

I had and still have the problem you described.
The issue is with ASUS Probe or the BIOS or the MoBo undervolting. I checked my PSU with a DMM when loaded and everything was O.K, so I'm inclined to blame the BIOS.

Ofcourse, I was ready to tweak my pots using the technique described here {For the general information of all FSP530 ownwers}.Look into these threads, it tells you how to actually make the Voltage measurement.

http://www.ocforums.com/showthread.php?t=258903
http://www.ocforums.com/showthread.php?t=352933

how expensive is expensive? you should be getting a 24pin,( not 20!!! ) truepower antec 550 with 36A on the 12v rail. period. its the best one out for us overclockers.

http://www.newegg.com/app/ViewProductDesc.asp?description=17-103-918&depa=0
or here
http://www.coolerguys.com/840556000563.html

why buy expensive parts then cheap out on what powers them all? i never understand people.

Time4aMassiveOC,
Well that the Antec is the best is debatable IMO but your other comments are very true indeed.
It would save a lot of people a lot of trouble when they didn't cheap out on PSUs.

jeeplover said:

Thanks for the information.

I need to borrow a digital voltage meter. It is too bad that mine can only show 3 integer number for voltage which is only 11V.

Click to expand...

dont forget that 2% in precision for 1V is 0.24V and most of the DVM have this precision, and you can forget the last digit. (the same applies for the sensors on the motherboard)

J-L

I can tell ya right now that its the PSU. You need atleast 20A on the 12v+ to run an A64 with any luck. Most people reccomend atleast 25A for overclocking with the optimal configuration being over 30A.

I'd start looking for a new PSU at this point Fortron makes a cheap alternative called "Blue Storm" might wanna take a look at it

Jean-Luc said:

dont forget that 2% in precision for 1V is 0.24V

Click to expand...

1*0.02 = 0.02
0.02 != 0.24

I think Jean-Luc means 0.02*12V=0.24

DaButcha76 said:

1*0.02 = 0.02
0.02 != 0.24

Click to expand...

Marcus Marti said:

Well that the Antec is the best is debatable IMO

Click to expand...

debatable against what? i dont know of any better power supplies with solid dependability reviews and reccomendations that produces the 550W and has 36A on the 12 v rail. if you happen to know of anything that even remotley competes much less beats it out. id love to know.

and if you have something in mind please provide a review.

PC Power and Cooling and also OCZ Powerstream are quite good.
Not to say better but surely equal.

jeeplover said:

I think Jean-Luc means 0.02*12V=0.24

Click to expand...

Yes right, thank you for pointing this out.

J-L

Thanks for the reminding.

I have RMA'ed my old psu and buy the following one:

http://www.newegg.com/app/ViewProductDesc.asp?description=17-103-924&depa=0

It is really nice since it provides two seperated 12V rails to ensure a reliable supply of power. It was rated as 10-point kick-*** product by maximumpc.

I will report the result after I get this one and see how high I can squeeze the cpu.

Time4aMassiveOC said:

how expensive is expensive? you should be getting a 24pin,( not 20!!! ) truepower antec 550 with 36A on the 12v rail. period. its the best one out for us overclockers.

http://www.newegg.com/app/ViewProductDesc.asp?description=17-103-918&depa=0
or here
http://www.coolerguys.com/840556000563.html

why buy expensive parts then cheap out on what powers them all? i never understand people.

Click to expand...