P4P800 slows down hour by hour after boot

[John Maynard Keynes]

Hi there,

When I first boot up my system I get standard benchmark results,
comparable to other Pentium 4 3.06GHz systems (same CPU as mine).

For example:

PCMark2002: ~7475 / 7964 / 1167
Sisoft Sandra memory: ~3275
Sisoft Sandra CPU: ~ 9467
CPUMark99 by ZDNet: ~200

An hour later I can get these results:
PCMark2002: ~7200 cpu / 7000 mem / 116x hdd
Sisoft Sandra memory: ~3000
Sisoft Sandra CPU: ~9200?
CPUMark99 by ZDNet: ~188ish

One time after I woke up after the PC had been for many hours, the
PCMark2002 CPU result was 5700! Now, I'm not stupid. I make sure other
programs aren't running when I run these benchmarks. Either in background
or foreground. I check with ctrl-alt-esc and make sure that the only thing
not Windows related running . . . is the benchmarking program.

My question is: Why? This has never happened to me before. Every other
computer system I've ever owned has maintained benchmark consistency
regardless of when I ran the benchmark. I'm using very conservative memory
timings (going by SPD), Hyperpath (MAM) is turned off. Performance is set to
Auto. Etc. Etc. I'm not pushing anything here. Any ideas? I'd like to
possibly get this motherboard replaced. I called Intel and they said this
kind of behavior couldn't be caused by the CPU because it's way too well
cooled for that (never above 48C even when a hyperthreading-enabled
benchmark is running). Typical temperatures are around 30C idle.

How do I contact Asus to get it replaced? A 1-800 number would be very
nice. The website makes it way too difficult to talk or e-mail somebody who
can help me, and the warranty part of the site appears to be down for the
moment.

Thank you for your help!

John

 

[Nelson Lee]

What is the reported CPU usage in Task Manager when the benchmarks dropped?
For a week or so when I first set up my system, I noticed a decrease in
performance as the day went along even when nothing was running (was running
W2K on Service Pack 3 with P4P800, 2.4G CPU) and the Task Manager was
displaying anywhere from 80 - 95% CPU usage. I suspected a software/driver
bug of some kind probably related to the service pack, so I did a clean
install and reinstalled everything except Service Pack 3 and the system has
been solid ever since.

Nelson

 

[John Maynard Keynes]

Thank you for your help.

Taskmanager uses between 0-1% of CPU time except on rare occasions.

John

 

[Jimbo Johnson]

Same thing happens here. I've tried everything. I'm dumping this piece
of shit motherboard and buying an Intel. Throwing this crap out the door
and never buy Asus again.

 

[Ayoub]

hmm, are you sure your cpu isn't running too hot?
if it starts getting too hot then you'll start getting cpu speed throttling
which may account for the lower benchmarks.
cheers