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If I base it with their performance, M645 is better than R705. M645 is quieter and does not heat up easily. The feature is really meant for personal use or for school. There is no big difference with the price when I check it through online, so I'll choose M645 with Processor Intel Core i5 i5-450M / 2.4 GHz with Max Turbo Speed 2.66 GHz, Features Intel Turbo Boost Technology and so many features. If you want to get the details, I'll add it in related links.

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13y ago

What else can I help you with?