XMP lowering clock speed+perfomance on Ryzen 7700X

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   Hey guys,

So I am running my CPU with my Asrock B650i Lightning WiFi mobo and I wanted to enable XMP on my RAM kit (Kingston 64GB KF560C30BBK2-64 at 6000 MT/s, CL30-36-36)

After enabling this setting, my PC is in fact running slower than with standard JEDEC speeds (slower on boot time, lower clock speeds and overall lower performance in a benchmark like Cinebench R24). My Bios is updated to the latest version (3.20) and I am currently running my CPU at -20CO offset via the builtin profile in bios. Also in Cinebench I noticed a decrease from 860 to around 690ish points with XMP enabled.

Is this a motherboard limitation? (with it being a mini ITX, maybe there were power constraints with the VRMs?)
Or could it stem from a thermals issue?(I am running quite hot on the CPU in this SFF build, reaching TJMax of 85c from the built-in PBO profile and sitting normally in high 60s-low 70s)

Thanks!

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carthrottle_fan Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: Yesterday Status: Offline Points: 50	Post Options Post Reply Quote carthrottle_fan Report Post Thanks(0) Quote Reply Topic: XMP lowering clock speed+perfomance on Ryzen 7700X Posted: Yesterday at 8:26am
	Hey guys, So I am running my CPU with my Asrock B650i Lightning WiFi mobo and I wanted to enable XMP on my RAM kit (Kingston 64GB KF560C30BBK2-64 at 6000 MT/s, CL30-36-36) After enabling this setting, my PC is in fact running slower than with standard JEDEC speeds (slower on boot time, lower clock speeds and overall lower performance in a benchmark like Cinebench R24). My Bios is updated to the latest version (3.20) and I am currently running my CPU at -20CO offset via the builtin profile in bios. Also in Cinebench I noticed a decrease from 860 to around 690ish points with XMP enabled. Is this a motherboard limitation? (with it being a mini ITX, maybe there were power constraints with the VRMs?) Or could it stem from a thermals issue?(I am running quite hot on the CPU in this SFF build, reaching TJMax of 85c from the built-in PBO profile and sitting normally in high 60s-low 70s) Thanks!

eccential Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 10 Oct 2022 Location: Nevada Status: Offline Points: 6200	Post Options Post Reply Quote eccential Report Post Thanks(0) Quote Reply Posted: 20 hours 25 minutes ago at 9:53pm
	Motherboard form factor isn't relevant. AsRock says B650i Lightning WiFi has 8+2+1 60A Dr.MOS, which should be more than enough for 7700X. Are those 60/70 -> 85C CPU temperatures? If so, wow, I would NEVER run anything I own that hot. I'm a reliability nut. I NEVER enable boost on any of my CPUs, and 100% of my PC builds for myself use ECC memory. I run my 9800X3D with boost disabled, meaning, it tops out at 4.7GHz, which is plenty fast for me. I don't like giving even 1.1V to any of my CPUs, and prefer to keep them under 1.0V. Obviously, I'm not a good reference point. Note, negative offset on a CPU that really can't deal with it will reduce performance because it will activate clock stretching. Instead of crashing, it stretches clock period to slow things down, so it doesn't crash. I never do XMP/EXPO because all memory I buy are unbuffered ECC memory, which are all JEDEC only. But do check if enabling it affects FCLK / UCLK. I think 2000MHz FCLK and 1:1 ratio is safe. I actually had to manually restore them after 3.20 BIOS update on my B850M-X. Originally, it defaulted to that, but after the BIOS update, it went down to 1750MHz FCLK and 1/2 speed UCLK (1400MHz). That's ridiculous. I forced it to 2000MHz FCLK and 2800MHz UCLK (for my JEDEC 5600MT/s memory). Stupid BIOS. Anyway, get HWiNFO64 and check your settings, as well as see if it's thermal-throttling.

M440 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 12 Jul 2023 Status: Offline Points: 4400	Post Options Post Reply Quote M440 Report Post Thanks(0) Quote Reply Posted: 17 hours 33 minutes ago at 12:45am
	what if you put memory training to auto? https://forum.asrock.com/forum_posts.asp?TID=30954&PN=1&title=solved-b650m-hdv-m2-bios-memory-stability-issues
	asrock b650m-hdv/m.2, ryzen 7700x@85watt, arch/kde

carthrottle_fan Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: Yesterday Status: Offline Points: 50	Post Options Post Reply Quote carthrottle_fan Report Post Thanks(0) Quote Reply Posted: 2 hours 10 minutes ago at 4:08pm
	Thanks for the reply, but could you maybe explain how does that auto memory training work, what does it do? Or should I just check in the manual if there's a reference for it But I will see if my Bios has this option, as I don't remember running into it so far.

carthrottle_fan Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: Yesterday Status: Offline Points: 50	Post Options Post Reply Quote carthrottle_fan Report Post Thanks(0) Quote Reply Posted: 2 hours 7 minutes ago at 4:11pm
	I am also quite wary about reliability, but I do like squeezing as much as I can from my hw, without raising voltages ideally or if so, very little. It is possible there is some thermal throttling as apparently this CPU should sit quite happily at 5GHZ all-core on full load apparently, so I will need to look into that.