Notebook Mainboard and ram spec

[Pat_Nim]

My laptop is 15s-gr0511AU  AMD Athlon Gold 3150U APU the mainboard is HP 87D2. the specification on the ad. say 4GB DDR4 ram @2400 single slot bran new from the dealer.

But when I test with many programs it shows that I have one SK Hynix DDR4-3200  4GB on my device. Also the DRAM Frequency of my machine always show 933.0MHz. not more than this.

I check with Windows performance in task manager, it shows Speed 2400MHz and slot used 1 of 2.

my question is:-

1.HP 87D2 with AMD Athlon Gold -what's the max ram bus I can put on. I can't find the spec of HP 87D2 anywhere.

2.How DDR4-3200 is on my board instead of DDR4-2400 from the factory (which it doesn't make any sense because DDR4-3200 cost more than 2400).

3.if it's a DDR4-3200 for real, when I'd like to upgrade more ram ,do I have to put DDR4-3200 instead of DDR4-2400.

4.why my Ram Frequency is just 933MHz. is it suppose to be at least 1100-1200MHz.

Thank you for all your kind advice,

Pat.

[banhien]

@Pat_Nim 

Its specs

       https://support.hp.com/th-en/document/c07672817

1. Main board: HP does not supply main board ONLY System board part # M03668-601 which contains 

• AMD Athlon™ Gold 3150U (2.4 GHz base clock, up to 3.3 GHz max boost clock, 4 MB L3 cache, 2 cores, 4 threads)
• AMD Radeon™ Graphics
• Windows 10 Home Single Language 64 license

2. RAM: It has 2 slots for DDR4-2400 dual-channel support (DDR4-3200 bridge to DDR4-2666, DDR4-2666 downgrade to DDR-2400MHz) and 16GB max.  HP RAM part #

• Memory module, 8 GB part # 937236-855
• Memory module, 4 GB part #  L10598-855

Regards.

[Pat_Nim]

Thanks for such an early reply. just some quick questions,

-I'd like to upgrade more ram, in this case I should take the DDR4-3200 out and put 2 of DDR4-2400 4GB.each or 8GB. each is better than put any 3200 in. Because it's going to run @2400 anyway, right?

-what about the Ram Frequency why it can run only 933MHz. instead of around 1200MHz. what can I do about it to make it run 1200MHz.

Thanks.

Pat