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Comment by namibj | Hacker News Reader

UDIMMs don't have worse timings. The only bad thing is that they don't offer binned dies with XMP profiles on their SPD. My Kingston Server Premier 32G sticks with Micron Rev. E 16Gbit dies (KSM32ES8/16ME) run these timings very reliably at 1.4V:

BankGroupSwap: Disabled BankGroupSwapAlt: Enabled Memory Clock: 1800 MHz GDM: Enabled CR: 1T Tcl: 18 Tras: 39 Trcdrd: 22 Trcdwr: 22 Trc: 83 Trp: 22 Trrds: 5 Trrdl: 9 Trtp: 14 Tfaw: 38 Tcwl: 18 Twtrs: 5 Twtrl: 14 Twr: 26 Trdrddd: 4 Trdrdsd: 5 Trdrdsc: 1 Trdrdscl: 5 Twrwrdd: 6 Twrwrsd: 7 Twrwrsc: 1 Twrwrscl: 5 Twrrd: 3 Trdwr: 9 Tcke: 0 Trfc: 630 Trfc2: 468 Trfc4: 288

Yes, they are somehow really hard to get in the US for decent pricing, but in the EU they are quite affordable (according to geizhals.eu ).

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OC'ing ECC is generally a terrible idea, if that's what you're doing. Also, no one on Ryzen is considering CAS CL22 timings "good" on DDR4-3200 sticks. I think you need to go do research on non-ECC RAM. It really feels like everyone on this thread is so far outside the normal PC market for RAM that they are talking out of their ass here.

The notably part is that I operate it at above 1.2V, which increases power consumption in a way that enterprise generally doesn't deem worthwhile. I run DDR4-3600 CL18.

I do question though how OC'ing non-ECC is a better idea than OC'ing ECC. Also, just for the record, I based my timings off of an XMP profile for a non-ECC version of the same die/capacity configuration (32G 2Rx8 w/ Micron Rev.E 16Gbit).

I also haven't seen 32G sticks that do better than CL22 at 3200 with just 1.2V.

> OC'ing ECC is generally a terrible idea, if that's what you're doing.

How so? For example I can see when the higher summer temperatures becomes an issue and reduce my timings, then tighten them again as it gets colder. No more random crashes where I wonder if it's my RAM or something else.

Currently doing 3333MT/s CL14 on 4x16GB of 2666MT/s ECC. I use CL16 in the summer. Since the memory sticks barely are affected by the heat, and that ECC errors occur on the same slot of the motherboard regardless of which stick is in there, I assume its the memory controller on the CPU in combination with four sticks of memory that's the limiting factor here.

I even got my 2 32G sticks in the same channel to 3600, but it wouldn't train with antyhing better than CL28 or therabouts. I heard that's likely due to the imbalance and/or quad-rank making the memory controller unhappy, as the PHY should be agnostic to the CL setting.

I mostly just did that test to check if I'd have to give up the 3600 speed if I'd upgrade from 64GB 128GB on this 5950X; I'm well aware that one shouldn't be running it single-channel, especially not if that would mean quad-rank operation.

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