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Re: I would say that AMD is quite competitive in this section with the x2 5600+

Not really. It's marginally faster than the E4500. Xbit-Labs did a review earlier in the year, which included an E4400.

http://www.xbitlabs.com/articles/cpu/display/dualcore-roundup_8.html#sect0

If you extrapolate, I estimate a total performance score of about 1.45. The 5600+ gets a blended score of 1.53. So it's about 5% faster. But on the other hand, if you look at power dissipation, the E4500 is extremely low in power, while AMD's 90nm Windsor cores are very high in power.

http://www.matbe.com/articles/lire/385/core-se-decline-en-pentium-et-celeron/page5.php

E4500 = 71W idle, 97W load (26W delta)
5600+ (FX-62) = 72W idle, 194W load (122W delta)
5000+ = 68W idle, 156W load (88W delta)

Or you can assume that the 5600+ is a lower power part these days if you want, along the lines of the 5000+ that was tested, but either way, the E4500 is low power and economical. It's a better buy for only 5% less performance. It's also $12 lower in price.