buildzoid

Enriched RTX 3090 Ti SuprimX PCB breakdown notes

Added 2022-07-06 16:14:25 +0000 UTC

This is my favorite of the normie 3090Ti PCBs. I consider it a normie 3090Ti since it only has 1 16pin connector unlike the HOF and KPE which have 2. Also the 16pin can handle less power than 3x 8pins. However retroactively increasing the power spec of 8pins to better match their physical limits is not a good idea so now we have the 16pin with it's 600W power limit(which is pretty close to it's physical limit).

Extra Features
Dual BIOS
20A Fuses on all 12V inputs. In the event of a VRM failure(rather unlikely with VRMs like these) these can make any repair attempt much easier
2x UPi Semi US5650 for shunt monitoring

Vcore VRM
LAYOUT
24 SPSs in total. 12 on each side of the GPU core to reduce power plane impedance.

CONTROLLER:
Monolithic Power Systems MP2891
assumed to be in 12+4 phase mode since it's a 16phase controller and Vcore has 24 SPSs while Vmem has 4. (+4 is for mem)

MOSFETS:
Monolithic Power Systems MP86957 70A SPS

MOSFET EFFICIENCY:
400A ~29W (the Vcore and MSVDD on a ref 3090 would do ~47W)
500A ~39W (the Vcore and MSVDD on a ref 3090 would do ~70W)
600A ~50W
800A ~77W
1000A ~108W

This Vcore VRM is stronger than even the best RTX 3090s:
HOF 3090 is 14+8 70A SPS
KPE 3090 is 13+6 60A SPS
Strix 3090 is 12+6 60A SPS

VCORE FILTERING:
220nH inductors (normal for 3090/3090Ti)
48x 2 terminal 220uF molded SMD aluminium polymer capacitors (FE has 40x 220uF)

Memory VRM
LAYOUT
4 SPS in total 1 at each corner of the memory power plane to improve impedance.

CONTROLLER:
Monolithic Power Systems MP2891
+4 phases for Vmem

MOSFETS:
Monolithic Power Systems MP86957 70A SPS

MOSFET EFFICIENCY:
100A ~9W

VMEM FILTERING
220nH inductors
13x 2 terminal 220uF molded SMD aluminium polymer capacitors (FE has 9?x 220uF)

12V / INPUT FILTERING
1x 330nH inductor for each of the 3 12V networks coming of the 16pin
1x 1100nH inductor for the PCI-e slot
28x 100uF molded SMD tantalum polymer capacitors (FE has 17x 100uF)
13x 180uF cylindrical SMD aluminum polymers (FE has 13x 180uF)

Based on PCB pictures from Techpowerup's review:
https://www.techpowerup.com/review/msi-geforce-rtx-3090-ti-suprim-x/