Will this computer run youtube videos at 1080p?

Thinking about buying this computer going to be for general use, always on internet and mainly on youtube, will this computer be able to play 1080p without any lag

Lenovo (IMB) b305 touchsmart all in one computer
-AMD Athlon(tm) II x3 400e processor 2.2ghz
-ATI Radeon HD5450 graphics
-640 GB hard drive
-4GB Memory Ram

basescores
Processor - 6.3
Memory (RAM) - 7.2
Graphics - 5.0
Gaming Graphics - 6.2
Primary Hard Disk - 5.9

It really doesn't matter how high the specs are (to an extent, you can't run a potato). It depends more on your internet connection believe it or not. If you internet connection is around 15 to 20 (Down) you'll be fine (at least with my testing, anything below around 13 can only run 480p)

It should, provided your internet speed is fast enough.