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PC Processors

6thc
Adept I
3 weeks ago

5800XT can't run memory at 3200 that 2700X could

5800XT can't run memory at 3200 that 2700X could using the same timings and voltages?

 

2700X could run 3200mhz using XMP and T1, I cannot even get to the OS booting most times with the 5800XT.

 

Does this have a very weak memory controller? Seems unfathomable yet here I am spending a full day now trying to just get a PC to run.

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FunkZ
Grandmaster
3 weeks ago

Ryzen 2000 series Pinnacle Ridge used a monolithic die whereas Vermeer uses an I/O chiplet, so the memory architecture is completely different.

Have you tried setting the XMP profile without manually forcing 1T CR?

Is Gear Down enabled?

 

Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT
Ryzen R7 5700G | B550 Gaming X | 2x8GB G.Skill 4000 | Radeon Vega 8 IGP
Ryzen R5 5600 | B550 Gaming Edge | 4x8GB G.Skill 3600 | Radeon RX 6800XT
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6thc
In response to FunkZ
Adept I
a week ago

Hey @FunkZ,

Thanks for that - it does indeed seem I can't get the CAS timings as tight as the Ryzen 2 series,
AMD support got to me and recommended CAS timings.

Following this I have managed to get T1 @3200Mhz, however w/wider timing intervals.
Gear down is enabled.

I am using 4 sticks, 2 packs of pair matched, CMU64GX4M4C3200C16 memory modules.

AMD support said: Memory frequency manually set to 3200MHz with 2 DIMM configuration or with 4 DIMMs, 2667MHz / 2933MHz is supported under stock condition as mentioned in the Memory section of the motherboard specifications at www.asrock.com/mb/AMD/B550%20Taichi/index.asp#Specification

I am using X470 AORUS GAMING 7 WIFI-CF v1.0 and not using an ASROCK board - however the timings and link did help me to determine to give up trying to get anywhere near old known good, 2700x timings on the new 5800XT CPU

 

I have this system stable now with manually dialed settings gained from auto values selected without XMP. I then manually dialed the memory multiplier to 32 and set the memV from 1.2 to the rated 1.35V

 

XMP settings do not work to boot, I cannot seem to boot even to the bios when using all stock auto/defaults but dropping to 18-22-22-22-54 timings etc, 20-22-22-22-54 seems to be the limit.

I was pretty keen on keeping T1 and I know the memory can do it at 1.35V so I was not prepared to pump more. I expect it is as you've said re cpu arch. - with this CPU I am back to playing games fine.

 

Incidentally; the whole reason upgrading CPU was because games were dropping frames very badly after ~30 to 40min of play... it turns out even on this CPU they suffered the same!

What it actually was, was Steam introduced some bug for Linux gaming, fixed by adding a string to "launch options" for the affected games:

LD_PRELOAD="" %command%

 

No instability no more frame drops, seems this 1080Ti AM4 build has more life in it yet, the case and components got a good clean out to boot. Cheers, 6th

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