Abstract: Iwill P4R533-N is based on the Intel i850E chipset which combined with the 82801 ICH2 southbridge offers host bus, memory and I/O interfaces capable of running on either 400MHz or 533MHz FSB.|
Issues with the Northbridge heatsink
All was not rosy as we ran the Iwill P4R533 through a few
sets of overclocking benchmarks. At first we had a lot of overclocking stability
problems with the board which we were able to get up to 148FSB for a while.
It would seem to boot fine enough at that FSB, but would crash out of
3DMark2001 half way through so that was a sign things were running unstable. We
upped the Vcore to 1.75volts and that helped at first, but then we would have
some really interesting clock changes mid-benchmark - again a sign things were
We saw some semi-stable overclocking results with
the 1.6A Pentium 4 at 2.32GHz (145x16 @ 1.725Vcore), but nothing that would last
for more than a few minutes or so. Finally, after a note from Iwill that they
had since replaced the passive northbridge heatsink with an active cooler (on
the retail versions) we put a fan to the i850E and saw things turn around.
With a fan blowing down onto the passive i850E heatsink
we were able to run the Iwill P4R533-N rock stable at 2.27GHz (16x142MHz). Vcore
was set to 1.575volts and the 256MB of kingston PC1066 RDRAM run at 400MHz. I'm
sure the new updated northbridge fan that Iwill will be shipping with the board
from now on will give you a bit more room to breath, but just to be on the safe
side we used something a little more powerful.
BAPco Sysmark 2002 takes a couple hours to run all the way through, and
having it restart because of a finicky system is right up there with going to the
dentist for a root canal. We pretty much ruled that out by using a 38mm Delta
7000RPM fan to cool that northbridge <grin!>.
Interestingly, the one instance when we moved the fan away from the heatsink
for about 20 seconds caused the system to freak out and become instable. Both
the i850E chipset and PC1066 RDRAM get quite hot after a good run of
benchmarking (estimate: 45-55 degrees) so good case ventilation with this set up
is high recommended, especially if you are taking the Iwill P4R533-N for a walk
down the overclocking path.
Our overclocking adventures with the P4R533-N was not very fun. We
could just not figure out why the system was having stability problems. The
system would POST as high as 152 MHz, but would BSOD while loading WindowsXP. It
would load into Windows successfully at 150 MHz and lower but any sort of stress
would cause the system to either crash or reboot.
After tinkering with cooling the northbridge the highest stable
FSB we could get was 142 MHz. Obviously we'll take free performance but we're a
little surprised that it didn't go any higher!
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