Gigabyte MZ73-LM0 Upgraded VRM heatsinks

Skillz · Mar 3, 2025

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 · Mar 3, 2025

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 · Mar 4, 2025

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 · Mar 22, 2025

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

Code:

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 · Mar 23, 2025

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

Skillz · Mar 23, 2025

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

Markfw · Mar 23, 2025

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 · Mar 23, 2025

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 · Mar 23, 2025

Ran an SR5 Benchmark on this:

Code:

──────────────────────────────────────────────────────────────────────────────────────
                                   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★
──────────────────────────────────────────────────────────────────────────────────────

Gigabyte MZ73-LM0 Upgraded VRM heatsinks

Skillz

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cellarnoise

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Skillz

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Skillz

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TennesseeTony

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Skillz

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Markfw

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Skillz

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