Question 2x32 GB + 4x16 GB RAM - At the end it shows only 80GB

May 11, 2023
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Hello Guys,

So today I updated my pc with additional RAM (RAM HyperX DDR4 64 GB 3200)

So currently I have:

  • HyperX 32GB (2x16GB) 3200MHz CL16 Fury RGB x4 - so 64 GB
  • HyperX DDR4 2x32 GB 3200Mhz - so another 64 GB
But when I go to BIOS (and windows) I see (81920 MB):


Question is why ?

Some more info:

My motherboard: MSI TRX40 PRO WIFI

CPU: AMD Ryzen Threadripper 3970X
 

Eximo

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Test to make sure each stick actually works would be the first step. Test slots as appropriate to see if they all work. Might need to re-seat the CPU for example, a lot of pins under there to connect.

You may be running up against with the population rules for the motherboard as well. Double sided vs single sided sticks sometimes have specific slots and orders they need to go in. You could try swapping the old and new stick's position.

Consult the motherboard manual for population rules.
 
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Hey there,

Well the why, here, is that you shouldn't mix and match different DIMMs. Specially so with a Ryzen system. They do not play nice together.

Which bios are you running? Check it with CPU-z. If its not up to date, then you may need to do that for further mem compatibility.

As suggested by @Eximo this may lead to a reduction in max speeds, even if the DIMMs are more than capable when you populate all channels.
 
Hello Guys,

So today I updated my pc with additional RAM (RAM HyperX DDR4 64 GB 3200)

So currently I have:

  • HyperX 32GB (2x16GB) 3200MHz CL16 Fury RGB x4 - so 64 GB
  • HyperX DDR4 2x32 GB 3200Mhz - so another 64 GB
But when I go to BIOS (and windows) I see (81920 MB):


Question is why ?

Some more info:

My motherboard: MSI TRX40 PRO WIFI

CPU: AMD Ryzen Threadripper 3970X
one of your 16GB sticks failed to initialize due to instability
cpu-z would report that it is there as it can read SPD data from that stick, but its hardware disabled (task manager should show you 16GB hardware reserved)

you can try clearing cmos and try mem training again, or try to shuffle your ram modules
 
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