Samsung 64GB DDR4-3200 CL16 (M386A8K40BM1-CRC)

64GB on a single DDR4 stick puts this Samsung module in the 90th percentile for capacity, with CL16 latency at the 88th percentile. But the server score is a rough 34/100 and affordability sits at the 31st percentile. If you need dense memory per slot and find it near USD 380, it's worth a look. At USD 717, walk away.

The 3200 MT/s speed is middle of the pack at the 54th percentile, which is fine but not exciting. What's more interesting is the CL16 latency at the 88th percentile. For a 64GB quad-rank module, that's a solid showing. The 16-18-18-36 timings mean the first word latency is around 10 nanoseconds, which keeps things responsive even if the raw bandwidth isn't going to blow anyone away. The 4Rx4 configuration is unusual for consumer boards, and that's where the server score of 34/100 starts to make sense. Quad-rank DIMMs can be picky about motherboards and often force lower speeds when paired with other sticks.

The capacity is the real story. 64GB on a single UDIMM puts this in the 90th percentile, which means you can hit 128GB with just two slots, or 256GB on a four-slot board if your CPU and motherboard can handle the rank loading. That's a lot of headroom for memory-hungry workloads like large datasets, virtual machines, or heavy video editing. Just don't expect gaming to care much. The gaming score of 68.8/100 reflects that most games won't touch 64GB, let alone benefit from quad-rank timings.

Against the Corsair Vengeance CMK64GX5M2B6000Z30 and Kingston FURY Beast KF560C30BWEAK2-64, this Samsung module is playing a different game. Those are DDR5 kits running at 6000 MT/s, which makes the Samsung's 3200 MT/s look slow on paper. But the Samsung is a single 64GB stick, while those competitors are typically 2x32GB kits. If you need maximum capacity per slot, the Samsung wins. The G.Skill Trident Z5 Royal Neo RGB F5-6000J2836G16GX2-TR5NG is also DDR5 and will crush this in raw bandwidth, but again, capacity per slot is the trade-off. The Crucial Pro Overclocking CP2K16G64C32U5B is a 32GB kit, so half the capacity. The Samsung's 88th percentile latency is actually competitive with some of these DDR5 kits in terms of absolute nanoseconds, which is a fun little quirk of DDR4's tighter timings.

Value here depends entirely on which listing you find. At USD 380, this module starts to look reasonable for 64GB of DDR4 with solid latency. At USD 717, you're paying nearly double for the same stick, which is hard to justify when the affordability percentile is already 31st. The budget score of 78.2/100 suggests the lower end of that range is where the math works. If you're shopping in the US, the cheaper of the two listings is the obvious move. The JPY 78,713 and MXN 11,404 prices are harder to compare directly, but they're single listings in their respective markets, so you don't have the same spread problem.

The Samsung M386A8K40BM1-CRC is a 64GB DDR4 module that lands in the 90th percentile for capacity, which is the headline here. You're getting a single stick with more RAM than most entire systems, running at 3200 MT/s with CL16 timings. That latency sits at the 88th percentile, so it's not just big, it's reasonably snappy for DDR4. But the server score of 34/100 tells you this isn't a datacenter workhorse despite the ECC Registered description floating around. It's a weird mix of specs that makes more sense for specific workstation builds than anything else.

We pulled pricing from a few regions and the spread is wild. In the US, you're looking at USD 380 to USD 717 across two listings. That's a USD 337 gap for what should be the same module. The budget score of 78.2/100 suggests the lower end of that range is where the value lives, but the affordability percentile is only 31st, so don't expect this to feel cheap compared to smaller kits.

If you're building a gaming rig, skip this. The gaming score of 68.8/100 and 54th percentile speed mean you're paying a premium for capacity that games won't use. A 2x16GB DDR4-3600 kit will outperform this in every gaming metric for less money. Server builders should also look elsewhere given the 34/100 server score and the confusing ECC situation. And if you're on a tight budget, the 31st percentile affordability ranking means there are cheaper ways to get 64GB, even if it means using two or four smaller sticks instead of one big one.

The Samsung M386A8K40BM1-CRC is a niche product that makes sense for a specific buyer: someone who needs maximum RAM capacity per slot on a DDR4 platform and doesn't care about flashy speeds. The 90th percentile capacity and 88th percentile latency are the reasons to buy. The 34/100 server score and 31st percentile affordability are the reasons to think twice. If you can find it at the USD 380 end of the US price range, it's a reasonable buy for a dense workstation build. At USD 717, you're better off looking at DDR5 alternatives or waiting for a price drop.