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Asus P5P800 trouble

B

Batman5177

Senior member
Hey all,

I just got a Asus P5P800, with a p4 3.2 prescott, 6800gt agp, 2 optical drives, 2 hard drives.
The power supply is an Enermax 420, which previously ran an Athlon XP at 2500mhz. I'm using the same ram, Corsair pc-3200. So the only parts that changed were the cpu and mobo.

This P5P800 keeps locking up and rebooting. I've downclocked it to 2 ghz, and the BIOS reads that the VCore is getting 1.31v. When I try to manually set it to 1.4, it won't POST. CPU temps are at 41C.

The power supply only has a 20 pin atx connector, but according to the sticky-ed thread in General Hardware, I don't need a 24 pin connector. The psu has 2 12v rails, 15A and 14A.

Any ideas before I buy a new psu??

Also, should I just keep the athlon xp? If the P4 ran at about 3.4 ghz, would it be faster than the xp@2500mhz in gaming?
 
I would think the enermax 420 would be adequate; but since you are running multiple HDD's and optical drives and a power hog 6800gt, you might want to try something more than 450w. The 20 pin ATX is good, but there should be another 4 pin 12v ATX plugged in along the top left of the mobo, just above and left of the CPU. Actually I suspect a RAM problem. How much RAM and is it Dual Channel etc. Try running 'memtest86'. If you have hyper-threading enabled, go into BIOS and turn it off and see if it settles down. If I think of anything else, I'll repost.
EDIT: First I might disconnect the optical drives and the HDD that doesn't have the OS and see if it gets running without lockups. That will point to inadequate power.
My P5P800 was a little flaky while using the Antec power supply; but I switched to an OCZ450w and it has been smooth sailing.
 
I had the 4 pin connector plugged in, and hyperthreading was off.

I put my Athlon cpu/mobo back in and it runs fine, memtest and prime pass for hours, and I even added another hard drive!

Just to install windows on the P4 combo, I had to unplug 1 of the optical drives, 1 hard drive, my audigy, 1 stick of ram, and all case fans. It was not stable even when I had 2 sticks of ram, even though this ram is on the compatible list in the mobo manual. I also had to downclock to 2ghz.

Does the P4 use that much power??

Thanks for all your help.
 
The P4 seems to use more; but I suspect those video cards with the huge (& noisy)cooling fans are the biggest culprits. There is no doubt they are power hogs. 25w just for the fan !! I'm not into gaming so I don't need a super-duper vid card. I use Radeon 9200 or Radeon 9250's in my systems; passive cooling, no fans. The P5P800 is a great board.. I'm ordering a secong one to replace my KM2M (PC4)
I hope you can get it stable; it's the easiest system I ever OC'd.
 
Are you sure your P4 is a Prescott? A P4 Prescott is 478 pin and the P5P800 is a 775 pin socket mobo. If you found a way to fit a 478 into a 775 socket... that may be your problem. You probably should be using the 540J 3.2 Ghz socket 775 P4.
 
Hi guys got the same problem as the guy above bought the Complete PC from my local store so cant give all makes and such, but has 1 dvd , 1 hd 120 gig, graphix is a geforce 5500(256meg). It has been back to the shop 4 times twice for new power supplies (now a 500 w) once for the ram to be changed but still have all the same problems as guy above.

 
What BIOS Revision ?? mine is at 1005 and is stable even oc'd by 15%. There have been BIOS revisions up to 1011 as I recall. Maybe you need to check that out; or you need to check your bios settings. Another possibilityis; you have an incompatible peice of hardware and/or a driver problem.
 
you know the most annoying thing is that it worked fine for about 3 weeks then this started after i returned from a works trip. And no one else uses the machine. The last reason given by the shop was that it was the drivers i've installed all the ones that i've been instructed to and still the same prob. Could it bee a fault M/B or a Faulty Processor
 
Originally posted by: NotquiteanooB
Are you sure your P4 is a Prescott? A P4 Prescott is 478 pin and the P5P800 is a 775 pin socket mobo. If you found a way to fit a 478 into a 775 socket... that may be your problem. You probably should be using the 540J 3.2 Ghz socket 775 P4.
Click to expand...

Err, northwoods are 478 only(well maybe some 423's also), Prescotts have 478 and 775 veriaties.

Prescotts are pretty power hungry, so maybe the dual rails are contributing to the problem if one of the rails is too weak for everything it's powering. I also suggest trying to install windows without the audigy, as creatives drivers can cause some strange problems, even if it worked fine with your A-XP system. Is your prescott a 5xx series(1mb of cache) or 6xx series with 2mb of cache? The P5P800 has the older 865 chipset, so you may need a bios update for it to be compatible with a 6xx series CPU.
 
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