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I have a Lenovo R61.

Am planning to upgrade the RAM.

Which version of DDR2 (667 or 800) should I use?

CPU-Z screenshot:

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The one the product manuals recommend. – Ignacio Vazquez-Abrams Dec 20 '10 at 5:04
My laptop didnt come with a product manual, it was a bulk purchase by the university without any papers given to us – Akash Dec 20 '10 at 5:06
It's called Google. – Ignacio Vazquez-Abrams Dec 20 '10 at 5:11
up vote 1 down vote accepted

RAM Speed : 332.7 MHz (3:5) @ 5-5-5-1

Get 667 MHz.

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how do you translate "332.7 MHz (3:5) @ 5-5-5-1" to 667 Mhz? – Akash Dec 20 '10 at 5:19
@Akash: It's not 667MHz. It's 667 million transfers a second. "Double data rate" means the frequency is half the transfer rate. – Ignacio Vazquez-Abrams Dec 20 '10 at 5:24

The R61 doesn't require DDR2 PC6400 (800mhz)--it's run with PC5300 (667mhz). I'd go with whichever one you can get cheaper.

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