Help choosing centrino 2 (montevina) processor

E8400 is c2d?

does not matter!

1) maximize clock speed! 2 cores is good 4 is better!

2) maximize fsb - faster the fsb the faster the memory bandwidth

3) maximize memory bandwidth - get the lowest latency memory at a give speed

at ddr800 you want 4-4-4 or 4-4-3 6.8k-7.2+ mhz bandwidth
at ddr1066 you want 5-5-5 o r 5-5-4 same
at ddr1333 you want 6-6-6 ddr3 (tough spot) ddr2 is tough to run at that speed you need 2.3+v

at 1600 you want 7-7-7- or 7-7-6 ddr3 10k bandwidth

Hello and welcome to the forums mate  

dragonsprayer,u misunderstood the OP,by 8400,he means P8400 and if u read the topic it says Centrino 2 (Montevina) which are laptop CPUs.
http://processorfinder.intel.com/List.aspx?ParentRadio=...

Hi and thanks for the welcome ;-)

also thank you for your reply but my questions was more practical and less technicall - in other words - should I spend 200 USD more and buy P9400 with my laptop or go with cheaper P8400?

Will I notice the difference and when and by how much in percentages?

Any suggestions?

I'm not too much into laptops, but its kinda interesting that reviews for CPU performance is very hard to find, if any.

I think the main thing about laptops, is what is featured or options in them for the money you pay.

This was one site that does reviews:

Search Laptop Reviews

Although it doesn't tell you all the exact performance wise to compare. But then when your comparing 2.4ghz to 2.5ghz, only thing to understand, there's not much of a difference in that.

They did provide SuperPI 32MB benchmark (Lenovo T500 ThinkPad Review) to give some kind of hint of processing power compared to older models, with other benches.