Built an MXM(clevo) 3080Ti

[Khenglish]

On 8/6/2025 at 2:49 AM, techmodlab said:

Hi mate, techmodlab from that video posted earlier 🙂 Great to see someone attempting the same fun stuff 😄

I got a question. You mentioned wrong resistors which held back your vram clocks. Which one you mean? 

I just upgraded from HC16 to HC18 and found just minor improvements on my max clock. I know that HC16 timings don't scale along and might get too tight at 18gbps (9000memClk) but still expected a little more. 

Maybe your findings with the resistors can help to improve it a little 🙂

Great work BTW! 

Cheers

Nvidia memory table resistor encoding map. I'd post an image, but it has Nvidia and Clevo employee names in a watermark:

LLL 0
LLH 1
LHL 2
LHH 3
HLL 4
HLH 5
HHL 6
HHH 7
LLM 8
LML 9
LMH 10
LHM 11
MLL 12
MLH 13
MHL 14

MHH 15

HLM 16

HML 17

HMH 18

HHM 19

LMM 20

MLM 21

MML 22

MMH 23

MHM 24

HMM 25

MMM 26

H = 1.8V
M = 0.9V
L = 0V

My vBIOS memory tables:



So currently I have HHH = 7 or LMH = 10 for Samsung 16 Gbit x 16.
For Samsung 8 Gbit x16 I had LLL = 0 or HLL = 4.

What'd odd is for changing to 16GB I remember only changing one resistor, but the tables above indicate I would have needed to change 2 or 3. I'll have to probe around when I can get back to a multimeter.