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Same results here, A2 overclocking is rubbish on my X299 OCF.

It's quite strange since older Z170 MOCF is fine with A2.

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I can offer some advice maybe. A2 likes higher vdimm. 1.85-1.95 here. Can you post which memory and your settings voltage and timings please.

A2 actually works better than A0 for me 🙈

 

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Edited by Splave
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43 minutes ago, Splave said:

I can offer some advice maybe. A2 likes higher vdimm. 1.85-1.95 here. Can you post which memory and your settings voltage and timings please.

I tried the 4000C12 profile and G.Skill RGB 4600C18 1.85-2.05V, no post. With A0 this preset can post.

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Edited by aerotracks
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3 hours ago, Splave said:

Ok which bios

Hey Allen

Can u upload  the 1.80b bios?

Tnx

Edited by gkmltd

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Posted (edited)

Pulled out the X299 OCF + 7740x and tested some medicre A2 B-die in the guise of XPG D80 3600C17.  P1.90 bios, passes 32M wazza. Hope this helps.

 

 

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Edited by sabishiihito
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Never tried any A2 on X299, Kaby or Sky X but I remember even with A0 on Kaby X 4133 12-11 wasn't exactly easy at least on early bios's.

Glad to see you guys testing this since I think most of not all future platforms will favor A2.

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also vdimm is real on x299 ocf so mocf is +0.06-+0.08 from bios set

 

also enable xmp is needed for over 3800+ on some sticks helps with training

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Stability goes down with more VDIMM. XMP is enabled.

1.85V VDIMM 1866MHz 12-11 max stable
2.00V VDIMM: 1666MHz 12-11 max stable
 

 

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On 2/29/2020 at 1:59 PM, gkmltd said:

Hey Allen

Can u upload  the 1.80b bios?

Tnx

https://drive.google.com/open?id=1pYblQ0Qg_C1sMRv0g9pwdbUZ0RSvVPll

1 hour ago, aerotracks said:

Stability goes down with more VDIMM. XMP is enabled.

1.85V VDIMM 1866MHz 12-11 max stable
2.00V VDIMM: 1666MHz 12-11 max stable
 

 

 

 

Can you try 4/4/7/4/5/5 on the bottom thirds? TRFC 240 need TCWL 9 because its throwing off the RTL too loose.

Sometimes A2 needs IOL 6/7 and a little different RTL. I will dust my kaby off an join you tomorrow. 

I think the main issue is the bios, can you try 1.20 ?

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31 minutes ago, Splave said:

Can you try 4/4/7/4/5/5 on the bottom thirds? TRFC 240 need TCWL 9 because its throwing off the RTL too loose.

Sometimes A2 needs IOL 6/7 and a little different RTL. I will dust my kaby off an join you tomorrow. 

I think the main issue is the bios, can you try 1.20 ?

Thank you, I will try tomorrow. Another thing, just using BIOS defaults and then loading XMP I can train 4360 and no higher.

I then looked in to QVL and supported 4600 kits are all A0 while fastest A2 set is 4333 speed. Coincidence or is this max MHz for A2 on the board?

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I tried P1.20

First 12-11, clocks still drop with more voltage. 1.85V VDIMM 1866MHz, 2V VDIMM 1800MHz
screenshot92pkj3.png screenshot11zpjbv.png

Then I switched to TRCD 12:

2V 1933MHz 12-12
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2V 2000MHz 16-12
screenshot13mbkxk.png

Going from 1933MHz to 2000MHz... no post with 1T, no post with C12,13,14,15

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ok how much SA and IO :D are the memory good on other boards/platforms?

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Posted (edited)

IO&SA 1.25V, I tried more and less volts and it doesn't seem to be a factor.

I cross checked mems yesterday and they are working ok, this is my working preset from Z270 Apex
screenshot39khkby.png

Edited by aerotracks

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could be the IMC Ive had some that cant do 4k at all. Was A0 working fine for you or also no 4k 😮 will join you shortly 

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