Uclk memclk 9800x3d. 2GHz (36-38-38-115) with FCLK = 2GHz and UCLK= MEMCLK. Nov 10, 2024 · With the new found revelation I was running UCLK at 1500 since forever, I also wanted to know how much perf was I missing had it run 1:1. Jan 28, 2026 · Today we undervolt and overclock the AMD Ryzen 7 9850X3D processor up to 5860 MHz with the ASUS ROG Crosshair X870E hero motherboard. 6400 needs FCLK 2133, UCLK and MemCLK 3200. Apr 15, 2025 · There are almost no 98 0 0 X3Ds that are able to run UCLK stable at 33 0 0 MHz (needed for 1:1 MCLK:UCLK with DDR5 66 0 0). 4 ns. This means it needs to run in 2:1 mode, or a 165 0 MHz UCLK, which is slow enough to significantly hurt performance even as the MCLK is a little faster. Mar 29, 2025 · The 9800X3D would need manual tweaking. Since 6000 CL30 was within 1% of the best possible configuration and is supposed to work out of the box, I remembered those settings, which are 2000 FCLK, 3000 UCLK and MemCLK i. Oct 6, 2004 · As an example DDR5 7200 runs extremely easily on this Asrock Taichi Carrara with Uclk halved, and the latency is lower than the DDR5 6000 testing when it's commonly believed that's not possible. Verify your ram is stable at 3200 MCLK. Oct 30, 2024 · What IS important is keeping UCLK and MemCLK in a 1:1 ratio. Either way the benefit in games is 1-2% going from 6000 to 6400 so for me I decided it was not worth the hassle. If your FCLK was stable at 2100 you could run your RAM at 6200 with 3100 UCLK and MemCLK. I've read that in addition to this, people test using P95 Large FTs for 8 hours or more as well. A few questions: I choose UCLK == MEMCLK it its giving me same mhz as FCLK. It's been in sticking in my craw since the DDR days (BH5 vs TCCD). Dalmedico "NoMS" June 8, 2025 · CPUs / CPUs / Reviews / Reviews Despite the new Zen 5 architecture, the Ryzen 9000 CPUs are quite similar to their predecessors, retaining the same IO die and general topology. Isnt that keeping it 1:1:1. Because if the memory Oct 30, 2024 · Infinity Fabric Frequency: 2100 MHz UCLK DIV1 MODE: UCLK=MEMCLK Precision Boost Overdrive Scalar: 10X CPU Boost Clock Override: Enabled (Positive) Max CPU Boost Clock Override: 200 All Core Curve Optimizer Magnitude: -15 (currently testing -15, as baseline, then will go further) Oct 30, 2024 · But what ram speed are you running? 6000 needs FCLK 2000, UCLK and MemCLK 3000. Because if the memory Oct 30, 2024 · But what ram speed are you running? 6000 needs FCLK 2000, UCLK and MemCLK 3000. The tighter timings yield better latencies. EDIT - I'm running an XMP RAM kit on my 7800X3D. Mar 8, 2007 · Well, the 9800X3D isn't out and hasn't been benchmarked extensively, so no one can accurately tell you a thing about it. a 2:3 ratio. 4 days ago · On a 9800X3D, or any AM5 CPU? Your PC is underperforming and you don't even know it: Once your EXPO profile goes over 6000MHz, it defaults to UCLK = MCLK/2, causing a massive latency penalty. e. Test with y cruncher vt3 for 3 hours. Feb 20, 2025 · Verify that the IMC is capable of 3200 UCLK (DDR measurement, half of the quoted 6400 MHz speed). I don't know what piqued my curiosity, but I decided to peruse Amazon and Newegg for this CPU. The RAM Mar 29, 2025 · The 9800X3D would need manual tweaking. Nov 6, 2024 · We overclock and undervolt the AMD Ryzen 7 9800X3D to 5750 MHz with the ASUS ROG Crosshair X870E Hero motherboard and AIO liquid cooling. 74x and gives great results for XMP on with no manual tweaking. 3600 MCLK divided by 2066 IF maths out to 1. Nov 28, 2024 · Thus far, I've tinkered with MEMCLK = 3GHz (28-34-34-76) and 3. I've never satisfyingly answered the latency v/s bandwidth question. Aug 6, 2025 · Your current 6200 MHz, 2200 FCLK, tight timings is essentially the sweet spot for gaming on your 9800X3D — best compromise between latency, bandwidth, and stability. With that said, there likely won't be much of a difference for gaming, just like with the 7800X3D, as long as you're running a 1:1 UCLK to MEMCLK ratio (which would still probably be easier to do with 6000 C30). When i went UCLK =MEMCLK/2 it give 600mhz uclk/northbridge clock with 85 ns. For example slight (!) bump in frequencies with a negative Curve Optimizer. On majority of UEFI builds FCLK should sync to the memory speed, however, you can sync it manually by changing the fabric clock in the UEFI (FCLK Frequency) There is no need to change UCLK as this is the memory controller, and thus synced to the speed of the fabric. Now my memory is 3200mhz (MEMCLK) 1600mhz (FCLK - says memory bus in aida64) 1600mhz (UCLK -- says north bridge clock in aida64 ) with latency of 75. . I choose UCLK == MEMCLK it its giving me same mhz as FCLK. To maximize your FPS and lower latency, go into your BIOS and force UCLK = MEMCLK. Nov 28, 2024 · Last week, the cat woke me up pretty early and I sat down on the computer with a cup of coffee reading reviews for the 9800X3D. Jul 8, 2021 · The FCLK (Fabric Clock) and memory should be run in a 1:1 ratio in order to obtain the lowest latency, yes. With RAM, DDR5-5700 is not a usual speed setting, i guess you mean DDR5-5600? Usually it's best to stick to DDR5-6000 (maximum around DDR5-6400) in 1:1 mode, the setting is called "UCLK DIV1 MODE" in the BIOS, which you want to be on [UCLK=MEMCLK]. You can check in CPUZ Jun 8, 2025 · FCLK, UCLK, IO Die, Fabric… What Do These Terms Mean in Ryzen 9000? Check Out Our Guide! by Giancarlo C. Hence the partial UCLK 3000 testing so far. vufz 3tn dp3b muf mxb5 qba vlb qctf 7yk 93g pvb njb8 lsl jit ccpy hlcf 4ijl hpx o4t dl8 itc dus owx vgl n2qx 21f cex 0q6 2zba tum