Explain this ddr 3 ram size to me

[RobTi]

I thought the blue (bottom one was 8Gb but bios shows different?
Thanks

 

[RobTi]

Thanks should explain more as I posted off the phone. Nephew said he had 16Gb top ones and had ordered another 16Gb bottom ones. So two top and two bottom and asked me as the total when added to his pc was 24Gb. So thanks I can now explain he has two 4Gb old ones top photo with the blue strip and his two new ones are 8Gb bottom with yellow strip.
Thanks

 

[RobTi]

Thanks all explained this to him and he is not happy as he has been running this pc for years thinking he had 2x8Gb sticks