KT6Delta onboard lan controller freezes machine!

KT6Delta onboard lan controller freezes machine after a recently purchase of new ram.
        TwinMOS PC3200 TwiSTER DDR 512MB CL2
        Chip = WLCSP, (DDR-PC400MHz)
Why i believe the ram purchase is the issue, you say?
Well you see this ram model is not on the supported list on the motherboard information page to msi. allthough the 256mb model is.
so i had to manually configure the DRAM timing so that my computer would run at fsb 166 and ram at 400mhz.
But lets get back on track. Everytime i copy over the network (large files that use top network speed) the machine either freezes or i might get away with a complete network connetcion loss. so i have tried to copy at different speeds and foudn out that 2 mbyte a sec is possible without the computer hanging.
i contacted http://www.broadcom.com support base and they did not know of any simmilar issues regarding the broadcom 57x integrated network hardware. But they did say that my ram might be the issue because the network card sends its DMA packets there.
and i quote:
"Response from Broadcom: I am afraid this is not a known issue to me.  But if you are saying with the different RAM this problem was not seen, this point directly to the RAM you use on this system and the compatibility issue.  The RAM could for sure cause this type of the problem since the network adapter DMAs packets into and from the system memory (RAM)."
So can anyone help me? i really want to be able to use my network hardware normally and not being forced to sell my current ram chip and buy a new one.
I can't remember all dram timings options but here are those i do remember.
CL = 2.5 (yes didn't work with 2)
Row precharge time = 5
Ras pulse width = 8
Ras to cas delay = 5
-Kim

Quote
What are your temps? Freezing often happens when CPU usage makes it too hot. I believe there is a way to check CPU usage in XP...
CPU temp is around 45-52 depending on what im doing.
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I have a hard time convincing myself that the symtom - the LAN - is the cause.
What do you mean? its the ram chip thats the cause for the network freeze (or at least that's where it all is pointing at).
Quote
What is your video card? ...Tell us your system while you are at it!
Here's a quick list i made on the fly.
ATI Radeon 9600PRO 128mb ram
Amd xp thoroughbred 2500+
512mb ddr ram twinmos twiser series
KT6 DELTA FISR2 or something
2*160 gb maxtor sata disks + 2*80 gb maxtor ide disks
yeah thats it.

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