Issue: PC will not boot when RAM set to 3600, but is stable at 3200.

Eeekster

Eeekster

Eeekster

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13 Apr 2018
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142
Hi,

I have the following system (3 years old) but have never been able to run the RAM at 3600 (it doesn't boot - either XMP or manual set to 3600) and crashes after a while at 3400, but stable at 3200:

The mobo: Gigabyte X470 Aorus Gaming 5 Wifi AMD X470
Ram: Team Group Dark Pro "8Pack Edition" 16GB (2x8GB) DDR4 PC4-28800C16 3600MHz
CPU: AMD Ryzen 5 Six Core 2600

It's not particularly bothered me, but now that I'm thinking of upgrading, I'd like to try and work out where the issue is, any thoughts?

Thanks!
 
Realised I should have added some data.. :

Ran memtest:
cycled through for an hour until hit 100% - no errors

CPUID says:
DRAM Freq: 1599.1
CL: 20
tRCD: 22
tRP: 22
tRAS: 53
tRC: 75

Which is weird as BIOS states:

CL: 15
tRCD: 15
tRP: 15
tRAS: 36
tRC: 50
 
OK, just had a thought... nothing like working things out as you go along...

Set XMP, and then manual set 32, and now BIOS and CPUID show:

CL: 16
tRCD: 16
tRP: 16
tRAS: 36
tRC: 53

So timings look correct.. not crashed yet.. but still at 32 rather than 36
 
Have you tried a small voltage increase?

The problem may just be your specific Rzyen 2600 cannot handle 3400/3600MHz. The memory controller is on the processor itself and is subject to the "silicon lottery" - some 2600's will handle 3600MHz just fine, some won't.
 
SonicSW20 said:
Have you tried a small voltage increase?

The problem may just be your specific Rzyen 2600 cannot handle 3400/3600MHz. The memory controller is on the processor itself and is subject to the "silicon lottery" - some 2600's will handle 3600MHz just fine, some won't.
Click to expand...

Thanks, I hadn't thought of that.

DRAM voltage increases to 1.35 with XMP - I'll find something to stress the system and see if it keels over, then maybe increase CPU voltage - then try at 3600 and repeat :)
 
Memory controller of old Zen(/+) is very mediocre and 3600MHz would need lots of tweaking.
 
Thanks, I've been doing some more reading off the back of comments, and it does appear to be the 2600 holding things up - this is partially good news, as it suggests my RAM is fine, so I can move it to my new system when I upgrade! (probably a 5600x).

I'll have more of a play, but satisfied it wont reach 3600 without some serious work/testing, and even then likely not.
 
Eeekster said:
I'll have more of a play, but satisfied it wont reach 3600 without some serious work/testing, and even then likely not.
Click to expand...

If you do manage to get it to run at 3600MHz it will be worth running benchmarks vs your stable 3200MHz configuration, you may find that the performance ends up being the same or even slightly lower depending on the timings, Infinity Fabric ratio etc as running an asynchronous IF ratio increases latency.
 
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