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Need help overclocking DDR4

Need help overclocking DDR4

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Ipod984
Senior Member
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707
07-30-2018, 06:25 PM
#1
I have a 16GB (2x8GB) DDR4 Corsair Vengeance RGB (CMR16GX4M2C3200C16 v4.31)running on Gigabyte Z370 Gaming 7 with Core i5 9600K I run Thaiphoon Burner and it says the DRAM manufacturer is Samsung and Part Number is K4A8G085W[B/C/D]-BCPB I also tried seeing the actual Memory IC and it says SEC 728 K4A8G08 5WBBCPB GEEK939WC I don't know if it is a Samsung B-Die or something else I currently have it overclocked at DDR4 3800 18-22-22-40 1.35v. I tried DDR4 4000 22-26-26-52 1.35v, but it did not even POST.
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I
Ipod984
07-30-2018, 06:25 PM #1

I have a 16GB (2x8GB) DDR4 Corsair Vengeance RGB (CMR16GX4M2C3200C16 v4.31)running on Gigabyte Z370 Gaming 7 with Core i5 9600K I run Thaiphoon Burner and it says the DRAM manufacturer is Samsung and Part Number is K4A8G085W[B/C/D]-BCPB I also tried seeing the actual Memory IC and it says SEC 728 K4A8G08 5WBBCPB GEEK939WC I don't know if it is a Samsung B-Die or something else I currently have it overclocked at DDR4 3800 18-22-22-40 1.35v. I tried DDR4 4000 22-26-26-52 1.35v, but it did not even POST.

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Sekiel
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56
08-17-2018, 02:57 AM
#2
3200MHz rated RAM isn't designed for 3800 and has almost no chance of running at 4000 even with relaxed timings. I'd consider trying 3600CL16 or 3600CL18, but running at 3800CL18 would likely be pushing the limits you can safely achieve.
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Sekiel
08-17-2018, 02:57 AM #2

3200MHz rated RAM isn't designed for 3800 and has almost no chance of running at 4000 even with relaxed timings. I'd consider trying 3600CL16 or 3600CL18, but running at 3800CL18 would likely be pushing the limits you can safely achieve.

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_phrekusCZ_
Junior Member
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09-07-2018, 02:55 PM
#3
It's not just about the speed either; there might be other factors at play. Testing for clock stretching could help, even if it runs fast, because a slow memory controller could be causing issues. Also, you can easily check if the system uses DDR4 by looking at the default timings—typically 14-14-14 or similar. Samsung devices usually follow these standards.
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_phrekusCZ_
09-07-2018, 02:55 PM #3

It's not just about the speed either; there might be other factors at play. Testing for clock stretching could help, even if it runs fast, because a slow memory controller could be causing issues. Also, you can easily check if the system uses DDR4 by looking at the default timings—typically 14-14-14 or similar. Samsung devices usually follow these standards.

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HydraEliphant
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212
09-24-2018, 08:28 PM
#4
It seems the highest speed I achieve is DDR4 3800. I managed to tweak the sub timings and test one setting at a time using TM5 Anta777 Extreme. I increased the voltage to 1.4V for stable performance at tCL 16. Removing the fan caused the RAM sticks to reach 50°C and errors, so I added a fan which brought them down to below 40°C and they are now stable. I experimented with tCL 15 at 1.45V but it didn’t boot. Various POST attempts failed (tREFI 65534, tRFC 280, tRRD_S 4, Command Rate 1). I considered lowering tRDRD_sg to 5 and tWR to 6, but might stick with 6 due to XP at 4 causing stuttering.
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HydraEliphant
09-24-2018, 08:28 PM #4

It seems the highest speed I achieve is DDR4 3800. I managed to tweak the sub timings and test one setting at a time using TM5 Anta777 Extreme. I increased the voltage to 1.4V for stable performance at tCL 16. Removing the fan caused the RAM sticks to reach 50°C and errors, so I added a fan which brought them down to below 40°C and they are now stable. I experimented with tCL 15 at 1.45V but it didn’t boot. Various POST attempts failed (tREFI 65534, tRFC 280, tRRD_S 4, Command Rate 1). I considered lowering tRDRD_sg to 5 and tWR to 6, but might stick with 6 due to XP at 4 causing stuttering.

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Ruubiee17
Senior Member
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572
09-24-2018, 11:42 PM
#5
For the i7-9600K it's usually better to use DDR4-3200, 3400 or 3600 and aim for tighter clock speeds (like CL14). Using DDR4-3800 or DDR4-4000 with relaxed timings would negatively affect performance.
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Ruubiee17
09-24-2018, 11:42 PM #5

For the i7-9600K it's usually better to use DDR4-3200, 3400 or 3600 and aim for tighter clock speeds (like CL14). Using DDR4-3800 or DDR4-4000 with relaxed timings would negatively affect performance.

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