Two weeks of tightening down a 48GB mismatched kit on an Asrock B450m Pro4 board and Ryzen 1600.

1 : Anonymous2021/08/03 05:06 ID: owwg4o
Two weeks of tightening down a 48GB mismatched kit on an Asrock B450m Pro4 board and Ryzen 1600.
2 : Anonymous2021/08/03 05:09 ID: h7ipeqy

These were the two RAM kits I am using:

For some reason I could tighten down the write timings more than the read timings.

3000 MHz at the original timings failed. Even when I loosened the timings to something like 18-22-22-42-64, 3133 MHz was not stable.

Maybe I could have gone farther if I manually changed the resistance and VSOC values, but I didn't know where to start as the DRAM Calculator did not support Micron's B-die, and definitely did not support mismatched RAM kits.

The most annoying part was when I thought I could tighten four more different timing values after each one of them was 2-3 hours stable, but ended up having to undo all four with additional stress testing, with the last one only throwing an error at the 23 hours mark. REEEEEEEEEEEE

ID: h7j2rxc

I have 1x8gb of micron b-die. Currently I have it overclocked to 3400mhz 16-20-20-14-36. micron b-die is really weird. I cannot get read and write timings stable at any lower than 20 but everything else performs quite well. Edit: I don't remember tRC timings. gonna check when i get home

ID: h7jdw0e

Which CPU do you have?

3 : Anonymous2021/08/03 09:40 ID: h7j9dcv

Am I reading this wrong or is the benefit really negligible?

ID: h7jru50

The Civ 6 benchmark shows how negligible it was. 😛

The biggest problem was not being able to find timing values to even make an attempt for 3200 MHz. I haven't bothered with the VSOC and resistance values because I'm not certain of how to make use of those.

I might get better RAM OCing results when I upgrade to a newer CPU sometime in the future. But that'll require a new GPU and and a monitor as I'm currently using a RX 570 4GB and a decade old 1900x1200 60Hz monitor.

ID: h7l3zhe

Civ 6 is NOT memory bandwidth or latency limited. It's all about single core IPC.

However, there are games that benefit a lot from more bandwidth and lower latency - witcher 3 is a great example.

ID: h7je5m5

TBH usually benefit is indeed negligible but it's FUN, lol

4 : Anonymous2021/08/03 05:11 ID: h7iplc9

Did you manage to get it fully reliable?

I recall tinkering with a mismatched kit, 2x8 and 2x4, for months. It was almost completely stable, but not quite. It would run for ages without an issue, but then have reboot issues, or very odd occasional Windows issues (such as sleep suddenly disappearing).

If you've managed to get it absolutely solid, without those little oddities, I salute you.

P.S. My (mis)adventures were with an X370 board and an R5 1600.

ID: h7jezhw

I had 2 slightly different sticks that won't even run at rated speeds in DDR2 era. They were both rated 800 mhz and had same capacity but one was dual rank. So I lowered them to 667 mhz to able to boot. Just makes sure you have same sticks to have minimal issues.

Funny thing is they had same brand and same model number. I purchased 2nd stick a few months later and tried to get same model but apparently some shitty companies sell different products under same model number. Unsuprisingly they (twinmos) have gone out of business.

ID: h7ipon1

+24 hours of memtesthelper stress test. I'm later going to run it for about another 16 hours.

5 : Anonymous2021/08/03 09:20 ID: h7j7zr8

want me to make you cry? Now run a memory stability test with a heaven loop in the background and see if the heat from the gpu unstabilizes the OC. I had a memory OC pass like 16000% of Karhul yet was crashing in games hit it with a karhul+heaven loop and before 100% pass the whole pc hardcrashed.

ID: h7jtc7n

Considering that I have 5 case fans (3x140mm intake with one of them connected directly to the GPU's 4-pin fan connector, 2x120mm exhaust) that never exceed 1000 RPM, I could bump them up to ensure that the GPU's heat never effects the RAM...

ID: h7k0ev4

i got 3 140mm intakes with 1 140mm exhaust with a 240mm aio blowing out from the top in a phanteks p600s(so a good airflow case) and it still had it happen. Just run it as i said with a heaven loop, even a few degrees higher can cause it to become unstable.

ID: h7m2v99

My memory doesn’t have heat sensors and I learned the hard way after redoing multiple over clocks that those eventual errors or performance issues over time were caused by heat. I found This out by throwing an old 90mm fan I had right at the memory, resting on top of the gpu and never had the issues again.

now this is decently overclocked bdie but the point still stands

6 : Anonymous2021/08/03 09:51 ID: h7ja36n

If you had invested that time into mowing lawns instead you could have afforded a b-die kit and a 5600x

But nice performance boost regardless!

ID: h7jrrzq

Most of the stress testing was done overnight or when I'm at work. I just make one timing value change at a time. It only gets time consuming when the BIOS refuses to boot and then I have to remove the CMOS battery.

Thankfully the place I live at has free electricity. I won't abuse the privilege by running crypto mining though.

The only reason I went with a 48GB kit was because of modded Cities Skylines using more than 30GB RAM, and on the original 16GB kit, the game was stuttering from constantly using page file while the CPU was at less than 80% utilization. I drew the line at paying $150 for the 32 GB kit, and was unwilling to pay even more for a 64 GB kit.

I've already pruned my Steam workshop list and I have about 1000 missing dependencies for the custom buildings (e.g. props and textures) to reduce the RAM usage, removed all custom content that were heavier than vanilla assets in terms of memory footprint no matter how great they were, and for one mod, I switched to an inferior version to save 1-2GB RAM usage.

The alternative is to buy an Optane drive and use that as a page file drive.

As for a 5600X, I would have to upgrade my GPU and monitor from my current RX 570 4GB and a decade old 1900x1200 60Hz monitor. My desktop cost me about $380 to build back in 2019, so that $150 for a 32GB RAM upgrade is a big outlier if it wasn't for Cities Skylines.

7 : Anonymous2021/08/03 09:44 ID: h7j9n8q

mine is stable (99% , sometime blackscreen when wake up from sleep) at 3000mhz 16-18-18-42-64

Fully stable(100% even sleep mode ) at 2933mhz , 16-18-18-38-56

my kit :

kit is C-die Hynix

my ryzen 1600x is quite d!ck so i'm Looking for either 3900x or 3700x.

8 : Anonymous2021/08/03 18:06 ID: h7kvq3b

is this a case of...

I just wanted to see if I could do it


just because you can does not mean that you should
ID: h7lqku3

I knew the mistmatched kits, cheap motherboard that uses daisy chain topography and a CPU that is known for its weak IMC would be a tough uphill to climb, but I wanted to try it anyways.

ID: h7lri53

Good on you.... nothing like a good challenge... I am planning this out right now....

9 : Anonymous2021/08/03 19:43 ID: h7l9kvy

You TIGHTEND the timings to 18-22-22-42-64 3133mhz...that's some really really really bad ram. I know first gen Ryzen yada yada, but I had no trouble with quality 3200mhz ram when I had a 1600x.

ID: h7lqpf3

With just the 16GB 3200 MHz kit, I could get it to 3333 MHz.

That loose timing attempt was to see if I could break above 2933 MHz with the four sticks of RAM.

10 : Anonymous2021/08/03 20:15 ID: h7le95x

Its the 1600 bro. It's mem controller will not handle above 3000. I know it is technically capable but the word is it just can't do it.

11 : Anonymous2021/08/03 23:49 ID: h7m6zaf

Yo, Are you the person I replied to like last week. I am fucking amazed you got this to 2933. Kudos.


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