Mac Pro 2.66, New Memory & Repeated KPs

Hi all
I've had 4GB of RAM in my Mac Pro for some time now, in the following config
Riser A - 2x1GB, EMPTY
Riser B - 2x512MB, 2x512MB
I recently upgraded to another 2x1GB, which I put in the empty slots of Riser A... I did this back in February or so - purchased from OWC... as soon as I installed them, my computer ended up KPing almost immediately and when I rebooted, the MP wouldn't boot anymore off the main drive...
So I returned those modules and got a replacement pair, which I finally got around to installing this past week... the KPs started almost immediately and all seem to be related...
Here's the latest one
Sat Apr 4 08:55:31 2009
panic(cpu 2 caller 0x001A9C68): Kernel trap at 0x00194178, type 14=page fault, registers:
CR0: 0x80010033, CR2: 0x00000308, CR3: 0x0149c000, CR4: 0x00000660
EAX: 0x240c8900, EBX: 0x00269190, ECX: 0x00000b80, EDX: 0x00000304
CR2: 0x00000308, EBP: 0x7f44ba28, ESI: 0x08269190, EDI: 0x00000fff
EFL: 0x00010202, EIP: 0x00194178, CS: 0x00000008, DS: 0x0d210010
Error code: 0x00000002
Backtrace (CPU 2), Frame : Return Address (4 potential args on stack)
0x7f44b7a8 : 0x12b4f3 (0x45b13c 0x7f44b7dc 0x1335e4 0x0)
0x7f44b7f8 : 0x1a9c68 (0x464700 0x194178 0xe 0x463eb0)
0x7f44b8d8 : 0x1a038d (0x7f44b8f0 0x0 0x7f44ba28 0x194178)
0x7f44b8e8 : 0x194178 (0xe 0xa610048 0x7f440010 0x1a0010)
0x7f44ba28 : 0x196491 (0x9b820e8 0x2c20a000 0x0 0x782f5050)
0x7f44ba88 : 0x16a4f0 (0x9b820e8 0x2c20a000 0x0 0x2c217000)
0x7f44bba8 : 0x16e804 (0x2c217000 0x0 0x8 0x1e1a744)
0x7f44bd18 : 0x172106 (0x1e1a26c 0x7f44bdb0 0xd000 0x0)
0x7f44bdd8 : 0x376176 (0x1e1a26c 0x7f44bf50 0xd000 0x0)
0x7f44bf78 : 0x3df460 (0x9ef4a80 0xa5d96c0 0xa5d9704 0x0)
0x7f44bfc8 : 0x1a0887 (0xa351040 0x0 0x1a30b5 0xa351040)
No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbfffdb28
BSD process name corresponding to current thread: OmniWeb
Mac OS version:
9G55
Kernel version:
Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386
System model name: MacPro1,1 (Mac-F4208DC8)

I suppose you want some ideas on why or what to do?
First try with JUST the new 2 x 1GB. Riser A 1:2 with all the other memory removed.
Second, install the "original" 2 x 1GB in Riser B 1:2 (that insures the ideal 4-channel config also)
Third, the 4 x 512MB should be either left out, or slots 3:4 on each Riser.
Fourth, insist on OWC TechWorks. And 2 x 2GB costs ~$30 more than 2 x 1GB.
Have there ever been parity errors? System Profile -> Memory.
Those can result in writing dirty data out to disk and leaving the system unstable.
Once you do get it back working you may want to do a fresh install or restore, depending.
Lastly, run Apple Hardware Test when you install new RAM.

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