I am looking for a motherboard, which

  • has AM 3+ CPU socket
  • support at least 64GB RAM (128GB is better)
  • DDR3 memory modules

From 32GB, there is a lot. For 64GB, I found nothing.

  • We need to know what CPU you plan to use. AM3+ motherboards can have up to 4 DIMM slots, so that means the CPU has to support 16GB DIMMs. Not many AMD CPUs have been released in the time since 16GB DIMMS became available, and very few 16GB DDR3 DIMMs came out to the market at all. There are 16GB ECC DDR3 memory sticks, but ECC may not be supported by your CPU.
    – Romen
    Nov 30, 2020 at 22:03
  • /proc/cpuinfo has this: AMD FX(tm)-6300 Six-Core Processor.
    – peterh
    Dec 1, 2020 at 18:53
  • Why would it depend on the CPU? It should see only addresses on the north bridge, isn't it?
    – peterh
    Dec 1, 2020 at 18:54
  • AM3 and AM3+ CPUs have the memory controller built into the CPU and there is no more "northbridge" on the board. AM3 CPUs that were backwards compatible with AM2+ sockets could work with a northbridge on older boards though. I do not see any limitations about the FX-6300 maximum memory, but it does not support ECC and the qualified memory list doesn't have any 16Gb modules. You will have to find non-ECC DDR3 modules and try them to find out if they work.
    – Romen
    Dec 1, 2020 at 19:37
  • I already have a motherboard, currently it runs with a 8GB+8GB+4GB+4GB confguration. That is 24GB and works well - except that the motherboard started to do ugly things (like power off - power on all the hdds, even on soft reset). I want to eject it from my system and buy a working one. And, if I replace it, I would also upgrade it. But, the important thing: another motherboard with 24GB DDR3 already works.
    – peterh
    Dec 1, 2020 at 19:40

1 Answer 1


Pick from this list

As @peterh mentioned, 970 and 990 boards (generally) support 64GB of RAM (ignore the ECS boards that list 128 GB, that's incorrect.) Since these boards aren't widely available anymore (due to their age and relatively limited popularity), a specific recommendation is pretty much useless as it's entirely dependent on what you can find on the relatively-volatile used motherboard market.

However, given the cost of 16 GB DDR3 UDIMMs, you may find it cheaper to just upgrade your entire platform (either to one with DDR4 support or with more RAM slots.) Given the age of the FX platform, you'll probably get a nice performance and feature set bump along the way too.

  • Wow! You are hardware & google talent. :-)
    – peterh
    Dec 16, 2020 at 9:30

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