Difference Between Memory Slots in Motherboard

[Mokgosi]

Hello,whats the difference between memory slots?

 

[4745454b]

More info is needed. Please ask clearer.

 

[Jay_83]

Oh I know, I know! COLORS!

 

[julius 85]

http://www.hardwaresecrets.com/article/Everything-You-Need-To-Know-About-DDR-DDR2-and-DDR3-Memories/167/7
The notches always correspond to a separator on the DIMM slot, therefore memories aren't backwards or forwards compatible. The number of pins is different, too.
http://www.google.cz/imgres?imgurl=http://www.3dnews.ru/_imgdata/img/2008/10/24/abit-fox/abit/dimms.jpg&imgrefurl=http://www.digital-daily.com/motherboard/abit_amp_foxconn_intel_g31/print&usg=__y3ieGjdrg3VkCIsDRc3yggjrET8=&h=375&w=500&sz=86&hl=cs&start=24&zoom=1&tbnid=dGYFN_IIySBLeM:&tbnh=142&tbnw=189&ei=eaYaTsCIEofEsgaa4vC1Dw&prev=/search%3Fq%3Ddimm%2Bslot%26hl%3Dcs%26biw%3D1440%26bih%3D785%26gbv%3D2%26tbm%3Disch&itbs=1&iact=hc&vpx=185&vpy=438&dur=1316&hovh=194&hovw=259&tx=91&ty=73&page=2&ndsp=24&ved=1t:429,r:6,s:24&biw=1440&bih=785: here you can see the separators.