Serious Kernel Panics?

So i've been having an evergrowing problem with my G5 quad 2.5 box over the last year or so. It started very rarely freezing while it was sleeping with the fans blazing. Over the last couple months it has become drastically worse... it is freezing nearly 3 times a day now, sometimes when it's asleep, sometimes when i'm running it. There is no common symptom for applications or anything.

I read a report that said to check my logs for PanicReports. I have over 100 panic reports in the last month.

I have ran full Apple Hardware tests stating nothing is wrong... as well as a number of RAM tests saying the ram is ok. I've switched out between 3 pairs of RAM sticks, as well as disconnected all peripherals... but had the problem still occurs under all states. I do have 2 video cards that I haven't tried testing without yet.... other than that, I can't find any sign of a hardware failure.

The kernel_panics all vary, but most looks similar to this:

Wed Sep 17 22:30:06 2008


Unresolved kernel trap(cpu 1): 0x300 - Data access DAR=0x0000000000000000 PC=0x000000000000B9CC
Latest crash info for cpu 1:
Exception state (sv=0x63069780)
PC=0x000009CC; MSR=0x00001030; DAR=0x00000000; DSISR=0x42000000; LR=0x00042130; R1=0x62D93D50; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x00452224 0x00002124 0x00356AA4 0x000B05D4
Proceeding back via exception chain:
Exception state (sv=0x63069780)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x1101c80)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

BSD process name corresponding to current thread: kernel_task

Mac OS version:
9E17

Kernel version:
Darwin Kernel Version 9.4.0: Mon Jun 9 19:36:17 PDT 2008; root:xnu-1228.5.20~1/RELEASE_PPC
System model name: PowerMac11,2
panic(cpu 0 caller 0xFFFF0003): "wait queue deadlock - wq=0x46ebec, cpu=0\n"@/SourceCache/xnu/xnu-1228.5.20/osfmk/kern/wait_queue.h:169
Latest stack backtrace for cpu 0:
Backtrace:
0x0009B498 0x0009BE3C 0x00029DD8 0x00042750 0x00356168 0x007A39A4 0x0035A414 0x0061F928
0x0036FEA4 0x000B4BF4 0x000B30B8
Kernel loadable modules in backtrace (with dependencies):
com.apple.NVDAResman(5.2.8)@0x79e000->0xa1efff
dependency: com.apple.iokit.IONDRVSupport(1.5.2)@0x786000
dependency: com.apple.iokit.IOPCIFamily(2.4.1)@0x609000
dependency: com.apple.iokit.IOGraphicsFamily(1.5.2)@0x760000
com.apple.driver.AppleMPIC(1.5.3)@0x61d000->0x620fff
dependency: com.apple.iokit.IOPCIFamily(2.4.1)@0x609000
Proceeding back via exception chain:
Exception state (sv=0x631d1500)
PC=0x000B66DC; MSR=0x00009000; DAR=0x52846504; DSISR=0x00200000; LR=0x00035854; R1=0x62D53CF0; XCP=0x00000014 (0x500 - Ext int)
Backtrace:
0x00035830 0x000360A0 0x00036BD8 0x00356B3C 0x000B05D4
Exception state (sv=0x588c5780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

BSD process name corresponding to current thread: kernel_task
/



Please help, any information would be great.... this is averaging 3 times a day, and its getting very inconvenient. This is a very fast box, and I am very curious as to what is causing this issue.