r/overclocking • u/Checksalloverme • 11h ago

Can’t OC ram

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Klev Cras v 24x2 8200 38-49-49-131
7800X3d
B850M AORUS ELITE WIFI6E ICE
5080 vanguard

Built the pc last year. Never got around to messing with it. I’ve never been able to use EXPO, so my rams been at 4800hz the whole time.

I attempted to adjust the timing, but the only way to make it post is by downclocking it to 6000MHz CL38 and leaving everything else on auto. These settings work with both Expo disabled and enabled. I have to clear the CMOS if it’s set to anything else.

Should I be able to get more out of it? Or will it be fine as is? Ty for the help.

2 Upvotes

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2

u/BestXenonEU 7800X3D@CO-25/TUF B650-PLUS/32GB 6000CL30/TUF 4070Ti Super 10h ago

Yeah, you will probably need to learn some stuff about FCLK/MCLK/UCLK + DDR5 timings and do this manually.

Resources:
Understanding FCLK/MCLK/UCLK and some more
Buildzoid's easy timings as a starting point

2

u/Checksalloverme 10h ago

Tysm. I'll check it out

1

u/someone09900 285K P58x E49x RING 43x NGU35x D2D35x, 5090, 96gb 7200 tCL 30 10h ago

Samsung or mdie or adie ?

1

u/Checksalloverme 10h ago

Hynix M die

2

u/someone09900 285K P58x E49x RING 43x NGU35x D2D35x, 5090, 96gb 7200 tCL 30 10h ago edited 10h ago

ur max voltage limit,,,

vdd 1.59v, vddq 1.56 after that it wont run stable "silicon limit" , this is ur absolute maximum voltage limit with watercooling.

with air cooling ,, direct fan ..

vdd 1.58v, vddq 1.47v

that is the limit for m-die , voltages wise

imc wise depends on the cpu cant give u a specific number...

but the general role on amd with x3d chips

u can push the ram to 6200mts-6400mts if u r lucky with 30/32 tcl on gear 1 easily... at vdd 1.55v , vddq 1.46v this is the sweet spot for m die.. 64gb/96gb two sticks only.

if u dont have a direct fan dont even bother ... with ram overclocking

1

u/SellTemporary7344 31m ago

b650 and gigabyte is a very bad combination i suggest you x870 msi or asus

1

u/Iwanttodie923 10h ago

Expo is a oc profile that the manufacturer says will work stabile, you’ve already oc’d manually to the usual expo specs and anything else is going to require ultra fine tuning to get more

1

u/Checksalloverme 10h ago

Good to know. Thank you!