The GX520 will happily support up to a Pentium D 820 at 2.8 Ghz but note that you must have A11 BIOS and it will still give you a message at boot time saying it's unsupported. It still works, however. $ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 15 Model: 4 Model name: Intel(R) Pentium(R) D CPU 2.80GHz Stepping: 7 CPU MHz: 2793.103 BogoMIPS: 5586.20 L1d cache: 16K L2 cache: 1024K NUMA node0 CPU(s): 0,1 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc pebs bts nopl pni dtes64 monitor ds_cpl cid cx16 xtpr lahf_lm

Flip your BlackBerry upside down, push down on the trackball and run it on a clean piece of paper for about 5 seconds. Be careful you don't call 911 by accident (by hitting the "Emergency" button). Works every time.