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  #1  
Old 10-14-2020, 11:27 AM
jonedeuf64 jonedeuf64 is offline
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Default CMD32GX4M2C3200C16 overclock 3600

Hi everyone,
Thanks to A Computer Guy i managed to set 3600Mhz stable with my ram

The presets given here : https://forum.corsair.com/v3/showthr...=187175&page=2 were good for Memtest64 , no errors after 4 pass but make windows 10 unstable, rebooting with no BSOD.

Here are my settings, stable ingame, running Farcry 5 and Horizon Zero Dawn Benchmarks with no errors:

CMW32GX4M2C3200C16 (ver 4.32)
DDR4-3600
18 - tCL
19 - tRCD
20 - tRP
42 - tRAS
62 - tRC
6 - tRRDS
9 - tRRDL
32 - tFAW
4 - tWTRS
12 - tWTRL
12 - tWR
4 - tRDRDSCL
4 - tWRWRSCL
496 - tRFC
18 - tCWL
6 - tRTP
8 - tRDWR
3 - tWRRD
1 - tWRWRSC
7 - tWRWRSD
6 - tWRWRDD
1 - tRDRDSC
5 - tRDRDSD
4 - tRDRDDD
0 - tCKE

DRAM = 1.35v
SOC = 1.025v override mode
Gear Down Mode = Disabled
Power Down Mode = Disabled
Spread Spectrum Disabled
ProcODT = 60 ohms
RTT_NOM = Disabled
RTT_WR = RZQ/3(80)
RTT_PARK = RZQ/1(240)
CAD_BUS = All 24 ohms

Last edited by jonedeuf64; 10-14-2020 at 11:36 AM.
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  #2  
Old 10-14-2020, 09:38 PM
A Computer Guy A Computer Guy is offline
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Quote:
Originally Posted by jonedeuf64 View Post
Hi everyone,
Thanks to A Computer Guy i managed to set 3600Mhz stable with my ram

...trimmed quote...
Nice! With GD disabled are you running CR at 1T or 2T?

Since then I found it's behaving as samsung c-die and interestingly less voltage can be more stable for a higher overclock.

Thanks to DirtyHarry in thread https://forum.corsair.com/v3/showthread.php?t=199955 for finding this helpful overclocking thread
Samsung 8Gbit DDR4 C-Die K4A8G085WC - OC results...

First try (a little unstable, pending adjustments)
DRAM=1.33v, SOC=1.025 +(SOC-LLC=L1) >> 1.2v
20-22-22-48-68 1T GDM tRFC=630 (AUTO on the rest)
DDR4-3733 106% https://www.userbenchmark.com/UserRun/33147352
DDR4-3800 107% https://www.userbenchmark.com/UserRun/33148103

My new B550 ITX motherboard has much better VRM and voltage control than my x470, but by default tends to juice the SOC a bit above 1.2v, and it took a bit to figure out where the right control was to bring it back down.

Here is what I am currently playing with ...

with ASRock B550 Phantom Gaming ITX
CMW32GX4M2C3200C16 (ver 4.32, dual rank, 2 sticks, 32GB)
DDR4-3800
20 - tCL
21 - tRCD
21 - tRP
48 - tRAS
68 - tRC
6 - tRRDS
9 - tRRDL
36 - tFAW
4 - tWTRS (last stable at 5)
12 - tWTRL (last stable at 14)
12 - tWR (last stable at 26)
4 - tRDRDSCL (last stable at 6)
4 - tWRWRSCL (last stable at 6)
590 - tRFC
18 - tCWL
6 - tRTP (last stable at 14)
8 - tRDWR (last stable at 12)
3 - tWRRD (last stable at 8)
2 - tWRWRSC (needed 2 to pass 128bit random number generation but this kills performance a bit)
6 - tWRWRSD
6 - tWRWRDD
2 - tRDRDSC (needed 2 to pass 128bit random number generation but this kills performance a bit)
4 - tRDRDSD
4 - tRDRDDD
2 - tCKE

FCLK 1900 (keeping 1:1 ratio)
DRAM = 1.33v
SOC = 1.025v override mode
CR = 1T
Gear Down Mode = Enabled
Power Down Mode = Disabled
Spread Spectrum Enabled
ProcODT = 36.9 ohms (I think with newer BIOS Zen2 CPU prefers lower ohms...I forgot how I landed at this value exactly)
RTT_NOM = Disabled
RTT_WR = RZQ/3(80)
RTT_PARK = RZQ/1(240)
CAD_BUS = All 24 ohms

Even though I can FCLK my 3800x to 1900Mhz it's probably at the bleeding edge of stability. I'm not sure if what other voltage controls may help improve the sub timings.
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Last edited by A Computer Guy; 10-14-2020 at 09:53 PM.
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  #3  
Old 10-15-2020, 12:38 PM
jonedeuf64 jonedeuf64 is offline
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Thank you for your post very interesting.

I'm running CR at 1T
Here is results : https://www.userbenchmark.com/UserRun/34174266

My CPU is not oveclocked, i thought it was not really interesting to overclock Ryzen 7 3700 but after a quick look to the thread i will try the 1900 ...
I've got a stock fan for my Ryzen . Overclock might be difficult, wait , burn and see
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  #4  
Old 10-18-2020, 12:04 AM
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emissary42 emissary42 is offline
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No luck with 3600 18-21-21 or 3600 18-20-20?

Usually GDM ON is the easiest for high frequency results. Disabling it only really makes sense if the system is stable with a CR of 1T since GDM ON tends to be faster than 2T (why it is also called "1,5T").
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