memory gear1 or 2 or memory oc

nelly999

nelly999

nelly999

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6 Aug 2011
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hi i have a new system i9 12900k on msi mpg z690 edge ddr4, and some new corsair vengence 2x16gb 4600mhz ram, now the pc wont boot in xmp @4600, so i have been testing the ram in bios, i know what gear1 ans 2 do, but cant figure out what is the best solution for me, i can oc the ram manually to 4566, if someone could explain in easy terms whats best, the function memory try it bios is what i have been using, this gear 1 and 2 is new to me thanks....
 
Your RAM has to be pretty fast to overcome the penalty of running gear 2, you'll likely find that it benches the best at the highest gear 1 clock you can achieve, even if that is below 4000.
 
Read this guide

  • Generally speaking, frequency should be prioritized over tighter timings, as long as performance is not negatively impacted by FCLK sync, Command Rate, or Memory Gear mode.
  • Gear 1 is preferred because the memory controller clock is synced with the DRAM clock speed. Desync incurs a latency penalty.
Click to expand...

If I recall, Buildzoid didn't like using Gear Down Mode 2 due to the latency penalties and I can't remember the exact details but even with the increased RAM speed, the total throughput would be reduced and it would severely impact latency sensitive applications.

gear 1 4000 wont post but 3866 gear1 does or i can choose 4533 wich doesnt say its gear1 or 2
Click to expand...
I'd try get 4000 Mt/s gear 1 stable using more voltage on the SOC and more voltage for the RAM. [edit: the guide says that you should leave it on auto for Intel. I run AMD so maybe don't change this] 4533 is almost certainly running gear 2 and not as fast as 3866 gear 1.

I always run my RAM voltage as manually set to 1.4v.

Follow this part of the guide:
  1. On Intel, start with 1.15 V VCCSA and VCCIO.
    • SOC voltage might be named differently depending on the manufacturer.
      • Asrock: CPU VDDCR_SOC Voltage. If you can't find that, you can use SOC Overclock VID hidden in the AMD CBS menu.
      • Asus: VDDCR SOC.
      • Gigabyte: (Dynamic1) Vcore SOC.
        • 1Dynamic Vcore SOC is found on certain Gigabyte motherboards and is an offset voltage. Therefore, the base voltage can change automatically when increasing DRAM frequency. For example, +0.100 V at DDR4-3000 might result in 1.10 V actual, but +0.100V at DDR4-3400 might result in 1.20v actual.
      • MSI: CPU NB/SOC.
  2. Set DRAM voltage to 1.40 V. If you're using ICs that roll over above 1.35 V, set 1.35 V.
    • "Roll over" means that the IC becomes more unstable as you increase the voltage, sometimes to the point of not even POSTing.
    • ICs that are known to roll over above 1.35 V include but are not limited to: 8 Gb Samsung C-die and older Micron/SpecTek ICs (before M8E).
    • To find what voltage to use for your IC, refer to the maximum recommended daily voltage section.
  3. Set primary timings to 16-20-20-40 (tCL-tRCD-tRP-tRAS) and tCWL to 16.
    • Most ICs need loose tRCD and/or tRP, so I recommend 20.
    • See this post for more information on these timings.
  4. Increase the DRAM frequency until it doesn't boot into Windows anymore. Keep in mind the expectations detailed above.
    • If you're on Intel, a quick way of knowing if you're unstable is to examine the RTLs and IOLs. Each group of RTLs and IOLs correspond to a channel. Within each group, 2 values correspond to each DIMM.
      Asrock Timing Configurator:
Click to expand...

Just an addendum, dual rank memory running in dual channel is faster than 4 by 8gigs running in sort of dual rank. I have a dual rank 3200 CL17 kit that outperforms my 4 DIMMS of 8gig 3200 CL 14 (Team Group Black) and very much outperforms my single kit of 2 by 8gig 3600 CL14 (TeamGroup Xtreem).

See here for more information on ranks.
 
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