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A620 w 7900 Need 5200 DRAM Profile Setting
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FiatDemise View Drop Down
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    Posted: 29 Feb 2024 at 6:30am
Hi, I updated my bios to latest non beta version 2.02. I am using this ram:

G.SKILL Flare X5 Series (AMD Expo) DDR5 RAM 32GB (2x16GB) 6000MT/s CL30-38-38-96 1.35V

I have found out that the max ram speed supported by my processor is 5200.
https://www.amd.com/en/products/apu/amd-ryzen-9-7900

In BIOS, I only see two DRAM Profile Settings, one for 4800, and 6000.

Is there something I can do to get a DRAM Profile Setting for 5200 to appear?
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FiatDemise View Drop Down
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Forgot to mention I have the ASRock 620I LIGHTNING WIFI motherboard. Is there a way to edit your post on this forum?
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Katana1074 View Drop Down
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Hi There..

Amd state the maximum official speed supported is ddr5 5200mt, However the sweet spot for amd is ddr5 6000mt, just load the Amd expo profile for ddr5 6000mt...
CPU: RYZEN 7950x | Motherboard: ASROCK X670E TAICHI | GPU: MSI RTX4090 LIQUID X 24GB | RAM: FURY X DDR5 C40 | Hard Drive: INTEL OPTANE 900P 480GB,1 x SAMSUNG 980 PRO 2TB,2 X ADATA S8200X 2TB
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FiatDemise View Drop Down
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I tried that, but got worse performance. I suspect the 6000mt performance being worse than 4800mt performance was due to the 6000mt speed not being officially supported.

I use XMRig to mine Monero. With ram at 4800 and AGESA default settings, I get a hashrate of 10k-13k. At Expo 6000 AGESA default I get like 6k-11k. At Expo 6000 Aggressive I get like 5k-10k.
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Katana1074 View Drop Down
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Hi there...

There's something else going on then you get less performance at 6000mt, have you set your infinity fabric speed ? start at UCLK:MEMCLK 1:1 and FCLK 2033....
CPU: RYZEN 7950x | Motherboard: ASROCK X670E TAICHI | GPU: MSI RTX4090 LIQUID X 24GB | RAM: FURY X DDR5 C40 | Hard Drive: INTEL OPTANE 900P 480GB,1 x SAMSUNG 980 PRO 2TB,2 X ADATA S8200X 2TB
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FiatDemise View Drop Down
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Is there a way to upload an image in this forum? Would be much faster if I could share pictures of my bios settings.

Anyway, for UCLK DIV1 MODE I have UCLK = MEMCLK
and for Infinity Fabric Frequency I have 2000 MHz.

Is FCLK = Infinity Fabric Frequency? And I should try setting that to 2033?
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FiatDemise View Drop Down
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Tried the Infinity Fabric Frequency at 2033, with Expo 6000 Aggressive, got 6k-12k. That's an improvement, but still not as good as 4800 performance.
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Katana1074 View Drop Down
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Don't think you can upload pictures to the forum, If you change infinity fabric speeds, you will need to adjust your voltages, I would keep testing, but it can be very long winded, I run ddr5 6400mt, with 2133 fclk (it gives me the most consistent results)...
CPU: RYZEN 7950x | Motherboard: ASROCK X670E TAICHI | GPU: MSI RTX4090 LIQUID X 24GB | RAM: FURY X DDR5 C40 | Hard Drive: INTEL OPTANE 900P 480GB,1 x SAMSUNG 980 PRO 2TB,2 X ADATA S8200X 2TB
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FiatDemise View Drop Down
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I got a suggestion to run a memory bandwidth test. I'm running Ubuntu, found this program called mbw.
https://unix.stackexchange.com/questions/32517/how-can-i-observe-memory-bandwidth

Running that showed much better results for 6000 vs 4800, values like 21k vs 17k. So, maybe I don't have a ram/mobo issue, but something more specific to xmrig.
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Katana1074 View Drop Down
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Hi there...

It does seem pretty much specific to xmrig, maybe adjusting your config in xmrig would help, sorry I cant be of more help....
CPU: RYZEN 7950x | Motherboard: ASROCK X670E TAICHI | GPU: MSI RTX4090 LIQUID X 24GB | RAM: FURY X DDR5 C40 | Hard Drive: INTEL OPTANE 900P 480GB,1 x SAMSUNG 980 PRO 2TB,2 X ADATA S8200X 2TB
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