RAM upgrade HP 705 G3

[RecmanKarl]

Hello we pretty much exclusively use HP and we have over 40 HP desktop's in our company and this isn't an issue I have seen before having looked after the IT here for nearly 6 years and upgraded many systems

Many years ago we bought a HP 705 G3 it came with 2x 4GB RAM modules we have upgraded to 4x 4GB and bought the exact same RAM as what it shipped with HMA451U6AFR8N

The RAM now runs at 1866mhz even though with any combination of just 2 sticks installed it runs at 2133mhz

All 4 sticks are identical and pass windows memory diagnostic checks

Its got an A8 9600 APU which would support 2400mhz in an unlocked pc with supported RAM

I have updated the BIOS to the latest version

There aren't any settings in the BIOS to manually adjust RAM speed

Some applications not perform slightly worse even though total RAM has doubled

Any assistance would be much appreciated

[BeemerBiker]

Have you looked at the SPD display of the CPUID app?  The app is also called CPU-Z.

Each slot should show the same JEDEC values.  Note that the voltage changes with the JEDEC.  Verify the voltage is correct by looking at the chip itself.  The SPD and voltage should match what CPU-Z shows.

I do not have that system but can offer a few other ideas.  

A few years ago there was a major update to BIOS of Intel and AMD to fix vulnerabilities in the CPU.  The changes affected timings as I recall that can lead to slower speeds.  Your system, 705 G3 is "outdated" but I noticed that the bios and chipset were updated by AMD this year.  It is nice that HP updates older system..  I also had a bios update to an old z400.  I did not expect that update as the system is really old

.

There is a chipset update for your system,  july 2021. I assume you put that in.  The bios update was Oct 2020 (V 2.35)  However, the bios 2.32 (no date shown in version history) is the one that fixed that vulnerability of 2 years ago: "CVE-2020-12890"  AMD took their time fixing it and I suspect 2.32 was released shortly before 2.37 like only a few weeks.  I assume you  upgraded to 2.37.

You might try an older bios and see if the speed stays at 2133.   If not, then at least you can run more and bigger programs, just not as fast ;>)