F5F Stay Refreshed Hardware Desktop RAM speed has slowed after adding four sticks.

RAM speed has slowed after adding four sticks.

RAM speed has slowed after adding four sticks.

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FinaLBaTTLe
Member
61
05-21-2021, 08:25 AM
#11
The design usually features straight primaries, such as 3600 16-16-16 or 4400 19-19-19. The only possible exceptions might be some 3200 14-16-16 kits, which are quite challenging to manage. They tend to run lower, especially when pushing high speeds with gear 2 or desync fclk. This causes a frequency difference between the die and lighter ICs like micron rev e or 16Gb rev B. This issue seems mainly related to rank configuration and most modules being daisy-chained rather than top-of-the-line. I don’t think it’s a big deal outside quad-rank setups and high-frequency scenarios. It looks like @RONOTHAN## likely ran tests with dual-rank 2 sticks and dual-rank with four single-rank sticks, so maybe the problem isn’t that severe even with a 4Gbit die. Still, it’s tough to run a 4x8 quad rank at 4400-4600 or even a dual-rank 4 stick on a powerful CPU core, though many top-tier boards handle it fine. Most of the best B3/450 models are already capable, so I guess I should probably adjust anyway—1.4V is enough for OC, not 1.7V minimum, and @WereCat does quad-rank rev E on Ryzen.**
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FinaLBaTTLe
05-21-2021, 08:25 AM #11

The design usually features straight primaries, such as 3600 16-16-16 or 4400 19-19-19. The only possible exceptions might be some 3200 14-16-16 kits, which are quite challenging to manage. They tend to run lower, especially when pushing high speeds with gear 2 or desync fclk. This causes a frequency difference between the die and lighter ICs like micron rev e or 16Gb rev B. This issue seems mainly related to rank configuration and most modules being daisy-chained rather than top-of-the-line. I don’t think it’s a big deal outside quad-rank setups and high-frequency scenarios. It looks like @RONOTHAN## likely ran tests with dual-rank 2 sticks and dual-rank with four single-rank sticks, so maybe the problem isn’t that severe even with a 4Gbit die. Still, it’s tough to run a 4x8 quad rank at 4400-4600 or even a dual-rank 4 stick on a powerful CPU core, though many top-tier boards handle it fine. Most of the best B3/450 models are already capable, so I guess I should probably adjust anyway—1.4V is enough for OC, not 1.7V minimum, and @WereCat does quad-rank rev E on Ryzen.**

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ElNacho
Junior Member
39
05-21-2021, 12:47 PM
#12
When the system doesn't start above 2133MHz it may indicate a memory issue. I'd still attempt a CMOS reset and retry. You might need to adjust certain parameters by hand. For my setup, I must raise the DRAM Current Capability from the standard 100% to 110%-120% when using quad rank. Since I'm using an ASUS board, the exact BIOS menu isn't clear—MSI provides different options elsewhere. You may want to manually set VPP_MEM to 2.5V or 2.52V (slightly higher to compensate for voltage drop). VTTDDR should typically be half your DRAM voltage. It's possible you'll need to boost the DRAM voltage beyond the XMP/DOCP level. A 1.5V setting works well for regular use with a B-die; you could increase it further, but that would likely require active cooling and might be unnecessary unless you're targeting very tight timings. DRAM R1/R2/R3/R4 should be set to 0 in AMD settings: under CBS/DF options, clear memory is off, and CPU ECC is disabled. For timing, I can't advise much since I lack experience with Samsung B-die. You'll probably need to enable Gear Down Mode as DISABLED if you plan this configuration. If these adjustments aren't sufficient, try the alternatives listed. AMD CBS/UMC options, DDR4 settings, PHY config, and PMU training are provided: PMU Pattern Bits = A (or 10 if needed), Pattern Control = Manual, FFE Training = Enabled, DFE Read Training = Enabled.
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ElNacho
05-21-2021, 12:47 PM #12

When the system doesn't start above 2133MHz it may indicate a memory issue. I'd still attempt a CMOS reset and retry. You might need to adjust certain parameters by hand. For my setup, I must raise the DRAM Current Capability from the standard 100% to 110%-120% when using quad rank. Since I'm using an ASUS board, the exact BIOS menu isn't clear—MSI provides different options elsewhere. You may want to manually set VPP_MEM to 2.5V or 2.52V (slightly higher to compensate for voltage drop). VTTDDR should typically be half your DRAM voltage. It's possible you'll need to boost the DRAM voltage beyond the XMP/DOCP level. A 1.5V setting works well for regular use with a B-die; you could increase it further, but that would likely require active cooling and might be unnecessary unless you're targeting very tight timings. DRAM R1/R2/R3/R4 should be set to 0 in AMD settings: under CBS/DF options, clear memory is off, and CPU ECC is disabled. For timing, I can't advise much since I lack experience with Samsung B-die. You'll probably need to enable Gear Down Mode as DISABLED if you plan this configuration. If these adjustments aren't sufficient, try the alternatives listed. AMD CBS/UMC options, DDR4 settings, PHY config, and PMU training are provided: PMU Pattern Bits = A (or 10 if needed), Pattern Control = Manual, FFE Training = Enabled, DFE Read Training = Enabled.

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