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Ryzen 9 3900X boosting problem with Crosshair VIII

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post #1 of 6 (permalink) Old 08-21-2019, 11:36 AM - Thread Starter
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Ryzen 9 3900X boosting problem with Crosshair VIII

Anyone else have trouble getting Ryzen 9 3900x to boost at 4.5 or 4.6 single core on Crosshair VIII Hero Wifi board? I have the latest bios from Asus site. Adequate AIO cooling (Corsair H105) in a Lian Li PCO-11 case with fans top and bottom. When I run Cinebench R20, max boost speed I got for single core is around 4.3 at best temp around 65ish, never seen 4.5 or 4.6. On all core CPU bench, usually around 4.0 or sometimes 4.1 temp around 80. What kind of BIOS setting are you guys using to get 4.6 single core boost? There's so many options in BIOS in regards to PBO and overclocking, tried many different combos and still can't get anywhere near 4.6. Sometimes I even got worse result with PBO set to manual or advanced and scaler at 10x.

I think they only time I saw 4.6 is when I had Ryzen Master set to game mode and one CCD active. Would be good if thre's a sticky thread or guide on here specific to Crosshair VIII and 3rd gen Ryzen and settings to get the best boost clock and performance.
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post #2 of 6 (permalink) Old 08-21-2019, 11:51 AM
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PC specs:
CPU: AMD RYZEN 3900X (@ 1.35V)
RAM: 32 GB 4266Mhz (two 2x8 kits) of trident Z RGB @3600Mhz CL 14 CR=1T
GFX: GTX 1080Ti MSI Gaming X
Cooler: NXZT Kraken X62 280mm AIO
Storage: Samsung 960 EVO 1TB M.2+6GB WD 6Gb red
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post #3 of 6 (permalink) Old 08-22-2019, 11:18 AM
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I have the 3900x and Hero III, hardly boosts past 4470

attached is a screenshot after running the computer straight for 2days, highest recorded boost (1000ms poll interval) is 4.467MHz

not matter how I config the bios, all optimizied defaults, pbo on/off, manually setting pbo settings, it never goes to 4.5 or 4.6.

guess there not much we can do except wait for new bioses with new AGESA
Attached Images

AMD Ryzen 3900x * Nvidia GTX 2080 Ti * Asus ROG Crosshair VIII Hero * 32GB DDR4 Corsair Vengeance @3733MHz
Watercooled * CaseLabs T10 * Corsair HX 1200i * LG 34GK950F @144Hz (34" 21:9) * Windows 10 Ent x64
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post #4 of 6 (permalink) Old 08-22-2019, 03:58 PM - Thread Starter
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Yeah disappointing indeed...tweak the bios so much and nothing is doing the trick. It's weird, when I had it in Game mode in Ryzen Master with one CC0, I remember seeing 4.5 or 4.6.
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post #5 of 6 (permalink) Old 08-23-2019, 12:37 AM
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In my case, closing background process is helping reaching higher boost, escpecially iCue. With iCue running i can only get 4.4 Ghz in Cinebench R15 Single Thread. If i stop iCue i can reach 4.525 Ghz on Cinebench R15 Single Thread.
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post #6 of 6 (permalink) Old 08-23-2019, 12:48 AM
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Have you guys tried moving around the m.2 in bewteen the different slots?

Ryzen 5 3600, 4.2 GHz Coolermaster 240R
x570 MEG ACE
Vengeance LPX DDR4-3200 C16 BK DC - 32GB
ASUS 1080ti STRIX with G12 & Kraken x62.
Corsair Force MP600 NVMe Gen4 M.2 - 1TB & 850 EVO pro 500GB
Moddet Silencio 650 + 4 SP120/140 corsair fans
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