5V prob with KK266

[Naeleros]

The title pretty well sums it up.. problems with my 5V dropping too low on my kk266. This is true even at default clock speeds. It droops clear down to ~4.5v at 1600. I have already tried the register edit at register 55 (EB data) which helps my voltage when IDLE... and I have also tried DangerousDogs trick to solder the 5V supplemental line onto my mobo (which added about .1V to my system).

Does anyone know any other tricks? Its very frustrating as it makes my system unable to do much in 3D (games , benchmarks, etc) above 1ghz. I just don't know what else to try...

James

 

[hooziewhatsit]

what power supply do you have?
Post all of your system specs, then we can help you better

 

[Naeleros]

Enermax 430w power supply. 2 months old.. tested 5V line with a multimeter .. 5.01 v.

KK266 mobo
1.4ghz AYHJA proc (same prob with 1.0ghz AXIA)
GF2 Ultra Vid card

Let me know if you need anymore specifics...

James

 

[William]

is the psu getting enough power? either that or something faulty on the mobo are the only two things I can think of unless you have some wierd component in your system messing with the 5V line.

 

[Naeleros]

I am thinking its a faulty mobo. The p/supply is getting enough power...I believe. I tested it in 2 different locations just to be sure. Similar results both times.

James

 

[el]

yeah your board is bad! I always have 5v+ with my [email protected]. is the reading in the bios or mbm5?

 

[Naeleros]

The reading is in anomaly with either the bios reading or MBM. I use both.. and they agree with each other.

 

[Josh]

Naeleros (Jul 25, 2001 01:50 a.m.):
Enermax 430w power supply. 2 months old.. tested 5V line with a multimeter .. 5.01 v.

KK266 mobo
1.4ghz AYHJA proc (same prob with 1.0ghz AXIA)
GF2 Ultra Vid card

Let me know if you need anymore specifics...

James

hello James,

if you check out the amdmb.com forums under the iwill section you will see people with exact same problem that are using Enermax PS.

There is a reason Enermax is NOT on the AMD approved power supply list. Granted the Enermax puts out 430 watts, but the problem is the combined power that it puts out throught the 3.3v and 5v leads to the motherboard is to weak to run high end AMD processors.

I'm running a humble 350 watt AMD approved PS on a duron with a vcore of 1.93 and 3 volt line at 3.38. Idle my 5 volt is 4.93, under load 4.83. I would first find an AMD approved PS to test your board before even thinking about returning it. Good luck.

Josh

PS This is not from experience, but i've heard ppl say the Antec 400 watt ps is really good deal for the money. In two weeks i'll be building a 1.4 ultra combo for a friend i plan on using this power supply.

 

[Naeleros]

Thanks, since posting here.. I have checked AMDMB. And.. I have came to the same conclusion that you just gave. I have also tested an AMD approved 250 W p/s that came with my Fong Kai case ... and it supplied higher voltage than my 430w Enermax. I'm a little disappointed in a p/s that I paid almost $100 for.. but.. oh well. Unfortunately, my little supply just isn't big enough to run my system under normal circumstances.. so.. I'm stuck with the Enermax until it becomes reasonable for me to replace it.

On a related note.. one of the biggest probs that I was having was inability to play 3d games or run 3dmark2001. Interestingly.. I was able to fix it by changing register 55 bit 7 to 0 as per a suggestion in the KK266 FAQ. That actually fixed my instabilities in 3d without affecting my 5v line. Possibly my 5v being as low as it is isn't the big problem that I thought it would be.

James

 

[Josh]

el (Jul 25, 2001 09:18 a.m.):
yeah your board is bad! I always have 5v+ with my [email protected]. is the reading in the bios or mbm5?

The SX1240 is an Antec case with the 400 watt power supply i mentioned in my previous post. As you can see this power supply doesn't mess around. You can check the approved list of AMD power supplies and see the combined specs for yourself.

Josh

 

[Neptune]

I have 5v problems on my EPoX 8k7A and also my new KK266 board. I have fixed the problems on the 8K7A, but havn't got around to doing it yet.

Basically, what you do is run a wire from a spare molex off your PSU and run it to one of the mosfets near the zif socket. Do this with a few of your molex's and mosfets and your 5v should go up, as well as your vcore stability. This is a quick overview... let me find an article with pictures and a detailed description.

 

[Josh]

Naeleros (Jul 26, 2001 12:57 p.m.):
Thanks, since posting here.. I have checked AMDMB. And.. I have came to the same conclusion that you just gave. I have also tested an AMD approved 250 W p/s that came with my Fong Kai case ... and it supplied higher voltage than my 430w Enermax. I'm a little disappointed in a p/s that I paid almost $100 for.. but.. oh well. Unfortunately, my little supply just isn't big enough to run my system under normal circumstances.. so.. I'm stuck with the Enermax until it becomes reasonable for me to replace it.

On a related note.. one of the biggest probs that I was having was inability to play 3d games or run 3dmark2001. Interestingly.. I was able to fix it by changing register 55 bit 7 to 0 as per a suggestion in the KK266 FAQ. That actually fixed my instabilities in 3d without affecting my 5v line. Possibly my 5v being as low as it is isn't the big problem that I thought it would be.

James

I have had the same problems with 3dmark2001. Without editing the register your talking around 1 hour max of loops. Changing the hex value 89 to 09 (seventh bit to a zero) on register 55 gives me stability(12 hours plus) too.

I like this board, but I have the cold boot problem with my geforce. Iwill's tech support refuses to believe that this is their fault. I think i'll call them tonight and see if they have a fix or will fix my board.

Josh

 

[Tacoman667]

Have you tested the 5v line on the PSU? My 8K7A runes at 4.88 and 4.73 at load but I tested my 5v line with a multimeter and I get 5.10+. It has something to do with a transistor on the motherboard near the AGP port. At least that's my problem. My Enermax 431 works and registers fine on my KT7A motherboard but all of a sudden has problems on this one.

 

[Josh]

Tacoman667 (Jul 26, 2001 05:55 p.m.):
Have you tested the 5v line on the PSU? My 8K7A runes at 4.88 and 4.73 at load but I tested my 5v line with a multimeter and I get 5.10+. It has something to do with a transistor on the motherboard near the AGP port. At least that's my problem. My Enermax 431 works and registers fine on my KT7A motherboard but all of a sudden has problems on this one.

Beg, borrow, or steal an AMD approved power supply and you'll notice the difference Check out the Iwill and Epox forums on amdmb.com for an indepth explanation.

Josh

 

[Neptune]

Sorry to keep you waiting... here's the link for the article, this should fix your problems:

http://www.dangerousdog.com/articles/kk2665vmod/kk2665vmod.htm

 

[el]

Josh you are correct. I thought the 430 would be enough and it is it just isn't a great PS. get the antec ps 400watt with a case for about 120. the case is sweet.

 

[earthdick]

I've been researching the problem with the 5v line on the mb on the amdmb.com Iwill forum. Do you really think that just changing the pws to an Antec from an Enermax will change the voltage? Or do I really need to do the voltage mod to the mosfet? I am what you would call an electrial engineering challenged (soldering included) person. My voltage on the 5v rail with the Enermax pws is 4.63v without overclocking. Thanks.