Hi! I'm trying my hand at a RAM OC, no dGPU so this is mainly to see if I can get a few more FPS in the silly old games I play. RAM is 2x Muskin MRX4U360GKKP16G, which has XMP settings of 3600 16-19-19-39 @ 1.4v. Thaiphoon can't identify it, but internet chatter suggests this might be single rank 16Gb CJR, crappy bin hence the 1.4v vs. 1.35v default.
I'm on Linux so I apologize if some of this isn't quite the way most ppl post here (eg., don't have Zentimings / AIDA). System is stable running y-cruncher (all tests) + GravityMark for CPU+GPU stress, GSAT.
Timings, RAM at 1.45v:
AMD Ryzen 7 5700G with Radeon Graphics
B550M-ITX/ac | BIOS L3.44 | SMU v64.71.0
Speed 4134 MT/s Capacity 32 GB MCLK 2067
BGS Enabled BGS Alt Disabled FCLK 2067
GDM Enabled Cmd2T 1T UCLK 2067
tCL 18 tRDRDSCL 3 VSOC (SVI2) 1.172 V
tRCDWR 22 tWRWRSCL 3 CLDO VDDP 1.0000 V
tRCDRD 22 tCWL 18 VDDG CCD
tRP 22 tRTP 8 VDDG IOD
tRAS 44 tRDWR 8 VDIMM
tRC 66 tWRRD 3 MEM VTT
tRRDS 4 tRDRDSC 1
tRRDL 4 tRDRDSD 4 ProcOdt (auto)
tFAW 16 tRDRDDD 4 RttNom (auto)
tWTRS 4 tWRWRSC 1 RttWr (auto)
tWTRL 10 tWRWRSD 6 RttPark (auto)
tWR 16 tWRWRDD 6
tRFC(ns) 319.79 tCKE 0
tRFC 661
tRFC2 538
tRFC4 331
P0 CHANNEL A: MRX4U360GKKP16G (16 GB, SR) DDR4
ramspeed's rambw puts bandwidth at 52,075 MB/s, not sure how it compares to AIDA benchmark.
4200 MT/2100 isn't stable at current voltages, but from what I understand Cezanne can easily do VSOC 1.2V. Should I bump that up more (and/or RAM voltage?), loosen the primaries and try higher speeds? Or keep things as-is, and try to disable GDM? Does BGS matter (I see a lot of ppl w/ it disabled)?
PS: big props to everyone who posts here – I'd actually given up on OC for quite a while after being unable to get things stable beyond 3733MT/s, until I recently stumbled on two posts here clarifying that (1) Cezanne APUs VSOC can be set way higher than other 5xxx CPUs, and (2) vSOC LLC needs tweaking to prevent droop = the crashes I was seeing when an otherwise stable OC immediately failed on iGPU use (wish the DDR4 Memory Overclocking Guide discussed that, but I suspect us iGPU users are in the minority). You guys rock!
1 Comment
You’re pretty much limited by what voltage you want to put into the vSOC (some people say 1.25, some say 1.4). I’ve personally ran 1.35 vSOC for a 5000mhz OC (see post).
Speed will be your biggest gain, especially with the iGPU.