Gigabyte MZ73-LM0 Upgraded VRM heatsinks

[Skillz]

I upgraded the VRM heatsinks on my dual SP5 board the other day. Figured this should help prevent them from getting too warm and over heating causing the CPUs to throttle which happens frequently on my Rome setups if I don't have some kind of active cooling aimed at them.



Forgot to take before pics of what they looked like stock. Thought I had one floating around from when I first got it, but I can't seem to find it or I didn't actually take any.

So I tossed the stock heatsinks in the pic next to the upgraded ones for comparison.

 

[cellarnoise]

Show off. Don't think those will fit a H13 SuperMicro board...

This thread kind of sucks

What is up with the little in-between heatsink. That thing is kind of useless!

 

[Skillz]

No they won't. They're a little bit longer than the h13ssl heatsinks. I compared them. But a Dremel and drill could make fit.

 

[Skillz]

Got this system running on the test bench now. Did some preliminary benchmarking on it.

Summary for AMD EPYC 9B14 96-Core Processor, test cutoff: 5m
candidate          |    credit    | tasks x threads, affinity |     task duration     | tasks/day | points/day
-------------------+--------------+---------------------------+-----------------------+-----------+-----------
  7271*2^2258773+1 |       137.60 | 192x1, ascending          |   0:20:21 =    1221 s |    13,586 |  1,869,466

According to our benchmarking results, this is the equivalent to 7.7 7950X systems.

It's consuming 1130W at the wall while a single 7970X system on similar load will draw ~200W.

First boot wasn't good. While it did POST and load into the OS. I didn't notice until a day later that one of the DIMMs was not being detected. It's got 2 DIMMs per socket. So one of the CPUs was running single channel RAM. After noticing some weird run times on PPSE when it was just running the sub-project open on PG I went looking. Seen the problem with the DIMM and basically lead me to the fact that the CPU wasn't seated properly in the socket. Once I reseated it though, all 4 DIMMs are detected and we're rocking now.

It's got dual, custom water blocks on it w/ those massive heatsinks on the VRMs. I am only running a single 360mm rad on the test bench. I got a MO-RA3 420 that will be cooling the system when I transplant it to the case.




She's a bit messy on the test bench.

 

[TennesseeTony]

What is the clock speed at 100% load? (With the current cooling)

 

[Skillz]

It gets around 2.8 to 2.9Ghz under PPSE and GFN18 loads. 100% cores, no SMT.

 

[Markfw]

I don't think there is anyway to have a dremel make those fit between the caps and whatever is on the other side of those heatsinks.

 

[Skillz]

Mark, those aren't the issue with mounting them on that board. The mounting holes are in different locations. I think you'll need to cut a fin off the heat sink and drill a hole in it. IIRC, the holes on the SM are closer together than the Gigabyte. Those heatsinks are like $75 shipped though. Not exactly cheap for me to buy them and try it at this moment.

 

[Skillz]

Ran an SR5 Benchmark on this:

──────────────────────────────────────────────────────────────────────────────────────
                                   BENCHMARK SUMMARY
                             AMD EPYC 9B14 96-Core Pro...
 Work Unit:                                                  Sierpinski/Riesel Base 5
 Number Tested:                                                     92936*5^5412996-1
 Points per Task:                                                           10,532.23
 Benchmark Duration:                                                           5m 13s
 L3 Cache:                                                                   10.00 MB
 Affinity:                                                                  ascending
──────────────────────────────────────────────────────────────────────────────────────
       CPU Config         │    Task Duration    │   Tasks per Day  │    Estimated PPD
──────────────────────────────────────────────────────────────────────────────────────
  48 Tasks x  4 Threads   │       3:58:17       │     290.056      │        3,054,936★
──────────────────────────────────────────────────────────────────────────────────────

 

[masterchi17]

Wow in desperate need of these heatsinks! How did you get them?

 

[Skillz]

Bought them on AliExpress, but I can't seem to find them. Clicking the link in my purchase history takes me to a page not found on their web site.

 

[Linktoheaven]

Can you share ipmi sensor data with vrm temp on full load? I think you set 400 Wt tdp on cpu? I'm choosing between MZ73-LM0 and MZ73-LM2 for same 9b14 cpu. LM2 have better VRM for 500 Wt tpd but it cost more money.
What temp you have on LM0 with custom mosfet heatsink.

 

[Skillz]

This is with both CPUs under a full 100% thread load. That's all 384 threads crunching.

CPUs are on water blocks.
VRMs are using those custom heatsinks in the pics above.

Motherboard is sitting on a table, not in a case. Haven't had a chance to toss it in the case and finish the rest of this project as some other project fell into my lap a couple months ago I've been working on.

 

[Linktoheaven]

View attachment 128218

This is with both CPUs under a full 100% thread load. That's all 384 threads crunching.

CPUs are on water blocks.
VRMs are using those custom heatsinks in the pics above.

Motherboard is sitting on a table, not in a case. Haven't had a chance to toss it in the case and finish the rest of this project as some other project fell into my lap a couple months ago I've been working on.

CPU tdp set on 400 Wt? not default 360? Mosfet heatsink has fan above or not have some airflow? Now i use h13SSL with 9v74 cpu (400Wt) and have near 65C on vrm. with custom heatsink.

 

[Skillz]

CPU tdp set on 400 Wt? not default 360? Mosfet heatsink has fan above or not have some airflow? Now i use h13SSL with 9v74 cpu (400Wt) and have near 65C on vrm. with custom heatsink.

No, no fans on it directly. Its sitting in a room that's currently around 85F though so the ambient temp is pretty high. Yes it's set to 400W TDP. My other H13SSL is also set to 400W TDP, no custom VRM heatsinks and also under the same load with 100% of the threads working (192 this time) and its temps are around the same as the dual socket motherboard temps. The H13SSL is also being cooled with a water block on the CPU and in the same room that's 85F. However, it does have those noctua fans resting on top of the VRM heatsinks. Not real sure they're doing all that great of a job.

So I'm not real sure those heatsinks are all that much better than the stocks ones.

 

[Linktoheaven]

No, no fans on it directly. Its sitting in a room that's currently around 85F though so the ambient temp is pretty high. Yes it's set to 400W TDP. My other H13SSL is also set to 400W TDP, no custom VRM heatsinks and also under the same load with 100% of the threads working (192 this time) and its temps are around the same as the dual socket motherboard temps. The H13SSL is also being cooled with a water block on the CPU and in the same room that's 85F. However, it does have those noctua fans resting on top of the VRM heatsinks. Not real sure they're doing all that great of a job.

So I'm not real sure those heatsinks are all that much better than the stocks ones.

When i use h13SSL without custom heatsink, i have near 90C and more on vrm with 400Wt tdp, with custom heatsink i have near 65 with 2 fan installed on front of the case. I use same bykski waterblock for sp5. And when i find custom heatsink (the same as you use ) for mz73-lm1 on chinese taobao i saw scenshots with ipmi sensors readings.

Now i think buy more expencive mz73-lm2. Cuz it have more robust vrm.

 

[Skillz]

I don't remember what the VRM temps were before I switched them on the dual board. I just knew the VRM temps are an issue on EPYCs as I have had issues with my Rome setups throttling heavily due to them getting to hot. So nearly all my Rome setups have fans on the stock heatsinks to keep them in check. Which is why when I built this system I immediately went looking for alternative ways to cool them as this particular system will be placed in an actual case. The Rome setups are all on the "open air mining rack" type setups as they all have multiple GPUs and it's just easier on maintenance and setup with the GPUs on riser ribbons out of the way.

As for your setup. You should totally give us a hand and join us in the Primegrid challenge going on right now. We're currently winning, but that can change quickly as we still got 4 days to go in a 5 day challenge.

More info can be found here: https://forums.anandtech.com/threads/primegrid-challenges-2025.2624853/ (this current challenge discussion is towards the latter pages of that thread)

Additionally, I as well as most of the TAAT DC Team is on Discord Link for that can be found here: A bunch of us are rocking EPYC's including Romes, Milans, Genoa's and Turin's. It's fun to participate in these challenges.