To back you up, I also have a positive experience with 64GB using 2 cheap Crucial 2133MHz/CAS15 4x8GB Kits running at 2400MHz 11/11/11/27/CR2
Aida throughputs are between 65-70MB/s and it is stable in
GSAT.
For your stress test you can run HCI memtest but it will take forever with 64GB, I prefer
GSAT if it passes one or two hours then you are pretty sure that your memory is stable. GSAT stress only the memory not the cache or core. If you found that GSAT passed but HCI memtest failed there is a good chance that cache is not stable.
Anyone else with a good 64GB experience?
MB: Asus Rampage V Extreme (WC loop1 rad 120x3) Bios 4101
CPU: Core i7-6950X (WC loop2 rad 120x9)
MEM: G.Skill Flare X 32GB (4x8GB) DDR4 3200MHz@CAS14/CR1
GPU: ZOTAC Trinity RTX 3090 Watercooled [double side] {PCIE_X16/X8_3 slot} (WC loop3 rad 120x9 + 140x9)
SSD: Corsair MP600 PRO XT 2To SSD M.2 NVMe w/ heatsink
HDD: 4 x 10TB Seagate IronWolf RAID 0 (WC loop1)
PSU: EVGA NEX 1500 1650W + Seasonic Fanless TX-700W
Main Screen: ASUS ROG Swift PG43UQ 4K 144Hz G-Sync/FreeSync HDR