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post #1 of 4 (permalink) Old 03-12-2019, 02:59 AM - Thread Starter
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5820k, overclocking DDR4, need help

I have an old 5820k and some Corsair Vegneance LPX 2666Mhz. 16GiB 4x4GiB, CMK16GX4M4A2666C that I'm having real trouble overclocking. Anything over 3000 Mhz. results in a no-boot condition that requires a dozen resets to get back into the BIOS to fix. I've tried cranking the Vdimm to 1.45V and it didn't help.

The primary timings for this set are not good: 16-18-18-18-35 @ 2666Mhz./1.2V (the primary set of XMP setting) and 16-18-18-37 @ 2800 Mhz./1.35V(the second set of XMP settings). So far I've been working off the second set of XMP timings with command rate 2T for my attempts at overclocking at speeds >= 3000Mhz. Do the secondary and tertiary memory timings also have to be adjusted? Should I try increasing the primary timings?
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post #2 of 4 (permalink) Old 03-12-2019, 05:04 AM
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Hi,
Frankly if you got above 2800 you should be happy with I suppose is micron memory chips with loose timings 2666C16 I assume.

If you want better get better memory

https://benzhaomin.github.io/bdiefinder/

3200C14 is the bomb on my 5930k

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post #3 of 4 (permalink) Old 03-12-2019, 05:18 AM
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I have similar memory, CAS16, 2666, Corsair LPX, except for its 4x8gb modules. I couldn't get it to over 2666 on Ryzen, in fact, it wouldn't even do 2666 without extra voltage on that platform. It is at 2666 on x99 as well here, but with the profile's voltage. (I had to set some other settings manually, to *lower* than what XMP did on auto... my motherboard was overvoltaging my IMC.) Be glad you can get it to 2800 at all since it's "low quality" (i.e. cheap) RAM with those timing specs and fab.

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post #4 of 4 (permalink) Old 03-12-2019, 11:06 AM
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Quote: Originally Posted by 8051 View Post
I have an old 5820k and some Corsair Vegneance LPX 2666Mhz. 16GiB 4x4GiB, CMK16GX4M4A2666C that I'm having real trouble overclocking. Anything over 3000 Mhz. results in a no-boot condition that requires a dozen resets to get back into the BIOS to fix. I've tried cranking the Vdimm to 1.45V and it didn't help.

The primary timings for this set are not good: 16-18-18-18-35 @ 2666Mhz./1.2V (the primary set of XMP setting) and 16-18-18-37 @ 2800 Mhz./1.35V(the second set of XMP settings). So far I've been working off the second set of XMP timings with command rate 2T for my attempts at overclocking at speeds >= 3000Mhz. Do the secondary and tertiary memory timings also have to be adjusted? Should I try increasing the primary timings?
I've also got a 5820k, Asus X99-S and LPX 3000MHz. It's impossible to run them higher than 2666 for me. First of all, you need to use the 125MHz strap, which was hard for me. On top of that, your CPU memory controller might not simple like running faster memory. Finally, not all memory can be overclocked, and certainly, this corsair modules are not renowned for its oc-ability.

Depending on your motherboard, it might set the system agent voltage higher depending on the chosen DRAM speed, you might want to play with that too.

Honestly, I would advise against wasting more time on this.

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