MacPro crashes

Very irritating. Am keeping the kernel crash reports here. Avert thy eyes!

Wed Nov 12 08:57:05 2008
panic(cpu 0 caller 0x00193077): “pmap_flush_tlbs() timeout: ” “cpu(s) failing to respond to interrupts, pmap=0x536500 cpus_to_respond=0x2″@/SourceCache/xnu/xnu-1228.7.58/osfmk/i386/pmap.c:4580
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x8feb3728 : 0x12b0fa (0x459234 0x8feb375c 0x133243 0x0)
0x8feb3778 : 0x193077 (0x45f3a4 0x536500 0x2 0x10d7d150)
0x8feb37e8 : 0x19420b (0x536500 0x78c96000 0x0 0x20f7a000)
0x8feb3888 : 0x17406f (0x18082b 0x0 0x10ebf0a8 0x400)
0x8feb3928 : 0x169e3a (0x2067008c 0x0 0x0 0x9000)
0x8feb3a48 : 0x16a437 (0x78c9f000 0x0 0x0 0x0)
0x8feb3a88 : 0x1824c7 (0x1799d20 0x78c96000 0x0 0x78c9f000)
0x8feb3ae8 : 0x42d220 (0x1799d20 0x78c96000 0x0 0x9000)
0x8feb3b48 : 0x42d284 (0x23385780 0x1799f78 0x10cdbc00 0x0)
0x8feb3b68 : 0x42d375 (0x10cdbc00 0x10000 0x0 0x0)
0x8feb3b88 : 0x42d34c (0x10cdbc00 0x0 0x2 0x4)
0x8feb3ba8 : 0x3eb7f9 (0x10cdbc00 0x0 0x8feb3be8 0x12)
0x8feb3bc8 : 0x4244a7 (0x10cdbc00 0x4 0x8feb3c18 0x3eb799)
0x8feb3c18 : 0x3eb72c (0x23385780 0x0 0x1 0x141de3)
0x8feb3c38 : 0x3eb7f9 (0x23385780 0x0 0x8feb3c68 0x1ae2e)
0x8feb3c58 : 0x892d8b (0x23385780 0x14a2bf5 0x8feb3c88 0x40400b)
Backtrace continues…
Kernel loadable modules in backtrace (with dependencies):
com.apple.ATIRadeonX1000(5.3.0)@0x881000->0x8defff
dependency: com.apple.iokit.IONDRVSupport(1.5.2)@0x873000
dependency: com.apple.iokit.IOPCIFamily(2.4.1)@0x73d000
dependency: com.apple.iokit.IOGraphicsFamily(1.5.2)@0x857000

BSD process name corresponding to current thread: WindowServer

Mac OS version:
9F33

Kernel version:
Darwin Kernel Version 9.5.0: Wed Sep 3 11:29:43 PDT 2008; root:xnu-1228.7.58~1/RELEASE_I386
System model name: MacPro1,1 (Mac-F4208DC8)