RAM not working at 3200MHz in Acer Aspire 5 A515-54G-540Q

atolan

Hello.
Me and my colleague have recently bought two identical Acer Aspire A515-54G laptops with 8GB 3200 MHz DDR4 RAM in a RAM slot. 
And while colleague's RAM is at 3200 MHz as it should, mine is showing only 2400 MHz in task manager. According to CPU-Z software we both have the same one inside, we even looked inside both laptops and there were the same RAMs installed. 
So my question is, where could be a problem? maybe I am missing some drivers. if so, which one?
Thanks for any help.

brummyfan2

Hi,
Maximum memory speed supported is 2400MHz in your model, so if you install a higher speed module, it will down clock to 2400MHz.

atolan

Hi.
It is an original RAM which was already installed in the laptop. And it is working at 3200 MHz on the other one identical laptop.

brummyfan2

Hi,
Yes, when they assembled the laptop, the module might have been available at the time, I am only going by what the manual says, according to the manual, your model can support maximum of 2400MHz, unfortunately I have no explanation for it working in another identical model.