Dell G5 5000 Memory Upgrade Problem

Re:  I decided to upĝrade and bought 32Gb of 3200mhz ram just like the dell one but unfortunately, once installed, clocks down to 2400MHz

you probably did not buy directly from Dell. Even though what you bought says 3200, its latency settings are different from Dell ram which is validated to run at 3200 in G5. Your new ram is not validated to run at spec frequency in G5.  Dell bios automatically down clocks ram that has settings not designed for G5.  Thus you got 2400.
Two options to correct this problem: buy crucial ram guaranteed to work in G5, or buy ram identical to your stock memory directly from Dell.

@LouisRDionne  Not clear what you did, so which of these applies?

1. You had 1x 16 GB and "bought 32 GB" of RAM, for a total of 48 GB?
2. You had 1x 16 GB and bought 1x 16 GB, for a total of 32 GB?
3. You had 1x 16 GB, which you removed, and installed new pair of 2x 16 GB, for a total of 32 GB?

Ok, I had one stick of 16GB DDR4-3200 from DELL, however, single channel RAM is pretty bad and so is mixing memory. With that knowledge in mind, I bought 2 sticks of the same brand (TeamGroup) 16GB DDR4-3200 and thus removed the one stick of RAM from DELL and put in mine. And that's when they get clocked down to 2400 even though the DELL one, who is also rated at 3200 runs at full speed of 2933. What's stranger is that in the manual for the G5 5000, they make it clear that 2x16GB @2933 is supported.

Hope that clears things up

Re: in the manual for the G5 5000, they make it clear that 2x16GB @2933 is supported

Although it is not said in Dell manual, it is implicit that only Dell validated OEM DDR4 will perform per spec.  Retail DDR4 is not guaranteed to work and often does not work at spec.

@LouisRDionne  Yes, that makes things clearer...

Can we assume you installed one new stick in the same slot where the OEM stick was installed (likely the 2nd slot from CPU) and put the second new stick in the slot with matching color retention clips (eg, 4th slot from CPU)?

You also have to keep in mind that RAM manufacturers rate speeds differently (XMP vs SPD), and various factors (eg, latency, rank) can make it hard to compare.

Is the new RAM single- or dual-rank? Single-rank RAM can be faster than dual-rank, but don't confuse dual-rank with dual-channel mode.

If you're willing to try an experiment, put the OEM RAM back in its original slot and put one of the new modules in the slot with matching clips and see what speed you get now...

@LouisRDionne  The issue there is not that Dell intentionally slows down RAM they didn't sell or approve. The actual issue is voltage. The motherboards in G5 and XPS desktops run RAM at the standard DDR4 voltage of 1.2V. Therefore, Dell-approved ram are sticks listed at 1.2V for a given clock speed.

The ram you bought was likely advertised as 3200 at 1.35V. Voltage is a way for ram manufacturers to "factory overclock" ram and thus advertise higher speeds. Those higher speeds only work on a motherboard that can push 1.35V to the ram (like the Alienware motherboards that have an XMP setting). When you install a 1.35V stick into a motherboard that can only give it the standard 1.2V, that ram will run at lower clock speed. 

@LouisRDionne , I agree with @RoHe . See if you can return it and get two of these. Or just start with one, pair it with your existing 16GB and see if it works well. 

@bertro514 @RoHe 

It seems the problem really is with the motherboard and the lack of XMP profile adjustment, I've tried @RoHe's suggestion and putting in one DELL memory stick and the one I bought and unfortunately, it also clocks down to match the 2400 of the one I bought. I checked and indeed the RAM I bought is rated at 1.35v so that's why.

That's a bummer, unless someone has any workaround looks like I'll have to live with this RAM configuration. Any suggestion is welcome.

I finaly nailed 32gb 2933MHz with 2x16gb Kingston 22CL Rams. "KVR32N22D8/16" 

16GB PC4-3200 CL22 UDIMM

The memory upgrade problem I have: Original Configuration: G5 5000 i7-10700F 16GB

I bought three 16GB sticks, two with the same brand, one from A-Tech. They all are low density and any two put to the system can work at 2933MHz bandwidth. (Either with or without DELL 16GB stick installed.).

Problem: When 4 sticks are installed, the bandwidth drops down to 2400MHz.

Any idea?

@rlin4633  - Never a good idea to mix different brands of RAM in the same bank (slots with matching color retention clips).

Put the Dell stick in slot closest to CPU and the A-Tech stick in the slot with matching color clips. Put the matched pair in the other 2 slots.

Then remove motherboard battery and press/hold power button on PC for ~30 sec. Reinstall battery. Boot up and check RAM speeds again.

I'm guessing it will still only run at 2400 MHz. You may need to get another A-Tech stick to match the one you have now, so you'll have two pairs. Then put each pair in slots with matching color clips.

Thanks, will try and let you know the result,