kernel freak caused by bad RAM - G5 PPC 2.0 Dual panic(cpu 0 caller 0x006BAB54): AppleDART::mapAddr(0x02372004) not mapped for I/O

Latest stack backtrace for cpu 0:
Backtrace:
0x000952D8 0x000957F0 0x00026898 0x006BAB54 0x002D52FC 0x00474C48 0x0046EFA8 0x0046EAAC
0x002D3844 0x002E771C 0x0052AD20 0x002E2E90 0x000ADA30 0x000ABF48
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleMPIC(1.5.2)@0x529000
dependency: com.apple.iokit.IOPCIFamily(1.7)@0x460000
com.apple.driver.AppleUSBOHCI(2.5.5)@0x46a000
dependency: com.apple.iokit.IOUSBFamily(2.5.9)@0x43f000
dependency: com.apple.iokit.IOPCIFamily(1.7)@0x460000
com.apple.driver.AppleMacRiscPCI(3.2.0)@0x6b4000
dependency: com.apple.iokit.IOPCIFamily(1.7)@0x460000
Proceeding back via exception chain:
Exception state (sv=0x5BC7BA00)
PC=0x000AF33C; MSR=0x00009000; DAR=0x06362000; DSISR=0x42000000; LR=0x00033F10; R1=0x2C513E30; XCP=0x00000014 (0x500 - Ext int)
Backtrace:
0x00033EB8 0x000A9514
Exception state (sv=0x00B3E000)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

Kernel version:
Darwin Kernel Version 8.9.0: Thu Feb 22 20:54:07 PST 2007; root:xnu-792.17.14~1/RELEASE_PPC
Model: PowerMac7,2, BootROM 5.1.4f0, 2 processors, PowerPC 970 (2.2), 2 GHz, 2 GB
Graphics: ATI Radeon 9600 Pro, ATY,RV350, AGP, 64 MB
Memory Module: DIMM0/J11, 512 MB, DDR SDRAM, PC3200U-30330
Memory Module: DIMM1/J12, 512 MB, DDR SDRAM, PC3200U-30330
Memory Module: DIMM2/J13, 512 MB, DDR SDRAM, PC3200U-30330
Memory Module: DIMM3/J14, 512 MB, DDR SDRAM, PC3200U-30330
Modem: MicroDash, Australia, V.92, 7.0, APPLE VERSION 2.6.6
Network Service: Built-in Ethernet, Ethernet, en0
Serial ATA Device: ST3320620AS, 298.09 GB
Serial ATA Device: SAMSUNG SP2504C, 232.89 GB
Parallel ATA Device: TSSTcorpCD/DVDW SH-S182D
USB Device: Hub in Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 500 mA
USB Device: USB-PS/2 Optical Mouse, Logitech, Up to 1.5 Mb/sec, 100 mA
USB Device: Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 250 mA
USB Device: Mbox USB Audio Device copyright Digidesign 2001, Digidesign Inc, Up to 12 Mb/sec, 500 mA  ¶ 1:20 am