overclocking P4 2.4 ghz to 2.9 ghz/Major Pixelation w/Vobs

[defense]

Very strange issue.... I got major pixelation and "screetching" sounds when playing Vobs on my hard drive AFTER I slowly increased my FSB from 133 mhz to 165 mhz. I also adjusted my VCore voltage accordingly, and everything appeared to be fine. My system did become "UNSTABLE" when I went as high as 166 mhz/FSB, and would start but I had no fuctionality.

It seemed as though getting up to 165 which was about 2.9 GHZ was really pushing it, but everything seemed fine. That was until I tried to play VOBS off of my hard drive. When I played the VOBS they would play but there was a TON of pixelation and screetching noise.

I tested all my movies on my HD and the same thing was true. I rebooted my computer and slowly went down in increments of 5 with the FSB or External Frequency setting in (MHZ) and when I got down to 153 everything was perfect. I decided to just go down to 150 mhz and everything seems to be great. I am monitoring all of my temperatures VERY closely, and they look great so far.

Anyway, my question is WHY would EVERYTHING appear to be great in terms of applications running at lightning speed and authoring and encoding, etc. But when I go to play a VOB with those overclocked settings, I had the issues I did? Anybody have any idea on this? I did a web search on pixelation and overclocking and only a few things came up which were related to "video cards.'

Maybe pixelation isn't the best way to describe it, but it's a good way. There were spots all over the screen. Anyone have ANY clue as to why this occured while everything else was fine? Thanks in advance for ANY info on this.

[defense]

anyone have any clue what would cause my system to play vobs with pixelation on a 2.4 ghz processor overclocked to 2.9 ghz..while EVERYTHING else ran smoothly.. Anyone?

[mrtristan]

Do you know if the FSB on your board is independent of the PCI and AGP slots? My old board would use a 1/3 multiplier for the PCI speed and I think it was 1/4 for the IDE controllers.

So when I overclocked to 109Mhz, the PCI devices ran at 34Mhz, instead of the normal 33. The difference wasn't big enough to make a change in the hard drive frequency, but it might have with your system.

[defense]

thanks for the reply. Actually, I have the ASUS P4B533. I am unsure the answers to your questions. I am pretty new to overclocking, and was very careful when experimenting. My multiplier on my P4 chip is locked at 18. I increased the FSB from 133, SLOWLY to 165.

That basically had me up to 2.9 GH'z processing WITH NO NOTICEABLE problem. Going up just ONE MORE NOTCH to 166, had my computer locking up, so I maxed it out at 165. TThen when I played some VOBS on my hard drive, (which is a 40GB Maxtor, 7200 rpm, by the way) I noticed that there was pixelation and "screetching" sounds as they played. I immediately knew it was because of the overclock because I had NEVER seen anything like that before.

Sure enough, once I went back down to about 158, the problem was gone. I decided to go down to about 152 or so, which gets me at 2.7 gh'z with no problems with vobs or anything else that I can tell thus far.

Anyway, with this info do you know what may of caused that issue? Do you think I should go back to the original 2.4 gh'z or stay at 2.7 gh'z which I'm at "safely" now? And last but not least, are you saying that my hard drive may of been the cause for that pixelation? Thanks in advance for your time, any help you can give me on this would be greatly appreciated.

P.S I figured I should sign up for a forum for this, but each forum wants you to fill out a "PERMISSON" form to ask questions on their forum such as overclockers.com, etc. LOL...can you believe that shit? Not only did they want me to fill it out...but get this...they wanted me to "mail" it to an address in another state. LOLLLLLL.....u gotta be kiddin'. I"ll take my chances with the question right here on the #1 forum. 8)

[zodiac]

when you o/c it does raise the fsb of the pci/agp so it can affect the video card,which your useing at max when you watch the vob files.
overclocking can affect other things then the cpu and ram.i heard some motherboards the usb stops working(if i remember right its MSI)
when i use to o/c i ran 3dmark,if it doesn't crash it's stable.
set the fsb to where you dont see any problems.

p.s.yeah you shoud go to a different forum where there are hardware geeks like http://discussions.hardwarecentral.com/?action=intro

[defense]

Zodiac, thanks for the info. So you are saying it was my video card, huh? That sounds like it makes sense. I have a Radeon 9000 Pro. Maybe I'll do what you say and check out the forum you linked. Hopefully I won't have to fill out a "permission" form to join the forum..lol...anyway, thanks for the info...until someone gives me an assuing answer, I'll stay oc'd at 2.7 Ghz. 8)