Will DDR3 memory freeze 10.04?

[scar]

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Trying desperately to figure out why a brand-new system running 10.04
64-bit keeps freezing after 3-5 days uptime.  power supply tests good,
memtest reports no errors after going through 1 pass, i re-greased the
cpu, fans running fine, tried running the system w/o graphics card
completely....

Is it the DDR3 memory?  I understand ubuntu doesn't support that speed
yet.  Or maybe some other new technology that ubuntu is tripping over?
it's an ASUS M4A87TD/USB3 motherboard.

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