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- Re: HP840 G4 memory (RAM) upgrade to 32G

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03-10-2020 04:48 AM - edited 03-14-2020 10:39 AM
I have some problem.
HP840G3 2x Samsung 8G memory work fine.
core i5-7200U 2500Ghz
Samsung M471A1K43CB1-CRC (PC4-19200 2400MHz CL17 1.2V Bulk)
Samsung M471A1K43BB1-CRC (PC4-19200 2400MHz CL17 1.2V Bulk)
two different modules, but it's work perfect = DUAL mode at 2133Mhz
In user manual "Max memory size 32G", ok.
But it dosn't work with Kingston HyperX Impact 2x16 modules
first try - Kingston HyperX Impact [HX426S15IB2K2/32] 32 G - 2666Mhz CL15
second - Kingston HyperX Impact [HX424S14IBK2/32] 32 G - 2400Mhz CL14
No BIOS boot, black screen, only beep and num flashing.
BUT!!! if i mix one old and one new modules, it's work!!!
Samsung 8G + Kingston 16G at 2133Mhz
Kingston 16G + Samsung 8G at 2133Mhz
ok. let's try Kingston 16G 2666Mhz + Kingston 16G 2400Gz
No!!! dosn't work!!!
Why?
Solved! Go to Solution.
Accepted Solutions
03-10-2020 07:01 AM
Because the memory you are trying to install is not compatible. It wants DDR4-2133 or DDR4-2400 at standard OEM latency likely CL = 16. Not 2666 not Hyperx low-latency gaming memory.
03-14-2020 09:52 AM
Thanks.
You are right.
BLS16G4S240FSD.16FBD
Ballistix Sport LT 2x16GB
DDR4-2400 CL16 SODIMM
Work fine. I am HAPPY.
But, one problem.
In CPU-z utility modules detected right.
In BIOS - unknown modules. And RAM freq = 2133 (min freq, safe mode)
I don't care, but it's sad.
Thanks.
03-14-2020 10:04 AM
BIOS is only written to detect stock HP modules and the Manual makes it clear that DDR4-2400 should be installed but will "bridge" (downclock) to 2133. So its working as intended. Thanks for letting us know it worked for you. We think we know what we are talking about but its good to get the occasional confirmation,