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Do I download the 32 bit or 64 bit version?

It has Intel Core2 CPU 6600@2.40 GHz & 2.00 GB RAM. It is running XP 32 bit.

So will 64 bit version of Ubuntu run on this machine?

Thanks,

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You can install both, because 32-bit OS is compatible with your 64-bit CPU, but to get performance benefits you should install 64-bit OS. For example Ubuntu 14.04 64-bit

Your CPU is 64-bit:

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Yep i'm running 64bit 14.04 ubuntu on Q6600 also http://ark.intel.com/products/29765/Intel-Core2-Quad-Processor-Q6600-8M-Cache-2_40-GHz-1066-MHz-FSB says Instruction Set 64-bit

$ sudo lshw -c cpu *-cpu
description: CPU product: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz vendor: Intel Corp. physical id: 4 bus info: cpu@0 version: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz serial: To Be Filled By O.E.M. slot: LGA775 size: 1596MHz capacity: 3800MHz width: 64 bits clock: 266MHz capabilities: fpu fpu_exception wp 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 x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dtherm tpr_shadow vnmi flexpriority cpufreq

$ uname -a Linux Vini 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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As a rule of thumb, any Intel Core CPU released after 2006 (when Intel Core 2 released) is 64-bit. That includes the entire Core i series. There's no reason to install 32-bit Ubuntu unless you know you need an application which has problems in 64-bit environment. If you don't know of any, you're probably fine. Go ahead and install 64-bit. In fact, if you're dual booting with Windows 8 on UEFI, only the 64-bit version supports UEFI.

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With that 2 GB of ram, install a Xubuntu or Lubuntu. This will give you extra RAM, It is recomendable to update ram to run many other applications. Just like an advice.

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