Nice Xavier,
I've calculated your Pi-product, its 46241, which is quite good with yorkie, close on the japanies guys at around 45500...

I have to ask you... maxmem=4096, thats should be the exact same effect as not setting an max mem? How comes you've configurated it?

Your sticks are D9GTR, right? Any chance of getting GTS?? It'll sure aid your result, however, not a bad word about your sticks, seems very equal to the ones I use..... Havnt got a yorkie tho'

EDIT:
Allowing myself to answer one question...
Yes, DDR3 benefits quite a bit, I belive its around 2000-3500 in average Pi product...