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I dont know what exactly you need, but AFAIK both qemu and VirtualBox can do paravirtualization (emulation). But that might or might not work as expected and can cause high CPU overhead.
Other than that, a new computer with any AMD A-series APUs (any AMD APU/CPU better than Sempron for that matter, even Brazos E series AFAIK) or Sandy/Ivy Bridge Intel Pentium (maybe Sandy bridge/Ivy Bridge Celerons too?) or higher Intel CPUs will do it.
Anyway, you should check the CPU to make sure it supports hardware virtualization (especially in lower level Intel CPU case, they have a habit of artificially limiting CPU features).
AMD does no such things, all their current APU/CPUs (at least Brazos E and upwards) have virtualization support. But make sure you pick something at least 1.5 GHz in any case.
Then either try emulation (qemu and vbox can do it, maybe wmvare too) or use another computer that has hardware virtualization support.
I used vbox without hardware support and it used idle cpu time like crazy (and any operation used 100% host CPU). Granted, it was with a Windows guest, but still the same guest with hardware virtualization had next to nothing idle CPU usage.