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Thread: Weak IMC or Bad RAM? (4000Mhz B-Die Kit on Coffee Lake) Reply to Thread
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  Topic Review (Newest First)
04-30-2019 03:53 PM
The Pook
Quote: Originally Posted by ViTosS View Post
Just using the same thread, I have a question, this is now my current memory OC (4000Mhz, CL17-17-37, 1.40v DRAM Voltage and 1.20v for VCCIO/SA), I only changed in BIOS the first main timings and the rest is on AUTO, do you guys suggest chaning something more? Also another question, when I set XMP, does it change those subtimings showed in ASRock Timing Configurator? Because when I set XMP and go back in BIOS, all of them are set on AUTO... Thanks!

XMP only sets primaries and tRFC. The rest is up to your motherboard.
04-30-2019 03:44 PM
Dasa Yes tighten your secondary's most can easily be halved.
See how close you can get to the secondary's in the last image posted.
04-29-2019 05:34 PM
ViTosS Just using the same thread, I have a question, this is now my current memory OC (4000Mhz, CL17-17-37, 1.40v DRAM Voltage and 1.20v for VCCIO/SA), I only changed in BIOS the first main timings and the rest is on AUTO, do you guys suggest chaning something more? Also another question, when I set XMP, does it change those subtimings showed in ASRock Timing Configurator? Because when I set XMP and go back in BIOS, all of them are set on AUTO... Thanks!
04-16-2019 08:49 PM
Alemancio
Quote: Originally Posted by The Pook View Post
tWRRD-sg has to = tCWL + 6 + tWRT-L
tWRRD-dg has to = tCWL + 6 + tWRT-S

Maybe your motherboard is just reverting to fail safes if you enter something that isn't possible.

I mean, if it's the best you can do it's the best you can do, can't win the lottery every time. Just lower all the timings as much as you can if you can't increase frequency. A lot of them are pretty high considering you're <4000mhz. Here's mine at 4133 if you wanna try and copy.
Thanks for the info, will continue benching.

Considering T-topology on this board and that Im again running only 2 sticks of 8gb, I do believe it's hard to get much better results - but your tips are always welcome!
04-16-2019 08:44 PM
The Pook
Quote: Originally Posted by Alemancio View Post
I also noticed that modifying WTR's it resets modules to 3200Mhz no idea why.

tWRRD-sg has to = tCWL + 6 + tWRT-L
tWRRD-dg has to = tCWL + 6 + tWRT-S

Maybe your motherboard is just reverting to fail safes if you enter something that isn't possible.

Quote: Originally Posted by Alemancio View Post
I just haven't been able to stabilize CL14 or even 15-14-14, while upping voltage of vccio/sa to 1.3v and vdimm to 1.5 helps, it's too much for a daily.

So what what do you think of the results?
I'll still try to lower tRFC and reach max on tREF but besides that, and maybe trying 1T I think this is the best I can get so far.

I mean, if it's the best you can do it's the best you can do, can't win the lottery every time. Just lower all the timings as much as you can if you can't increase frequency. A lot of them are pretty high considering you're <4000mhz. Here's mine at 4133 if you wanna try and copy.
04-16-2019 08:26 PM
Alemancio
Quote: Originally Posted by The Pook View Post
AFAIK most boards will just override tWR to 2x tRTP if you set it too low and POST normally.
I also noticed that modifying WTR's it resets modules to 3200Mhz no idea why.

I just haven't been able to stabilize CL14 or even 15-14-14, while upping voltage of vccio/sa to 1.3v and vdimm to 1.5 helps, it's too much for a daily.

So what what do you think of the results?
I'll still try to lower tRFC and reach max on tREF but besides that, and maybe trying 1T I think this is the best I can get so far.
04-16-2019 05:13 PM
The Pook
Quote: Originally Posted by Falkentyne View Post
Will a system even POST if tWR is less than double the tRTP value?

AFAIK most boards will just override tWR to 2x tRTP if you set it too low and POST normally.
04-16-2019 04:48 PM
Falkentyne
Quote: Originally Posted by The Pook View Post
You likely could still drop tRFC/tWR/tRAS a bit, but looks good

Run AIDA64 and compare 3600 CL16 vs 4000 CL18, but I'd probably run 4000 if all the subs are identical. My RAM benches a bit faster at 4133 16-18-18 than 4000 15-17-17.
Will a system even POST if tWR is less than double the tRTP value?
I believe tWR must be => 2x tRTP.
04-16-2019 04:41 PM
Alemancio
Quote: Originally Posted by The Pook View Post
You likely could still drop tRFC/tWR/tRAS a bit, but looks good

Run AIDA64 and compare 3600 CL16 vs 4000 CL18, but I'd probably run 4000 if all the subs are identical. My RAM benches a bit faster at 4133 16-18-18 than 4000 15-17-17.
Agreed! These are the results:

Small Update here, haven't been able to tighten to 14-14-14- and still figuring out 15-14-14-, but based on my last most stable results this is 15-15-15 with tight timings all around (feedback is welcome!)



Quote: Originally Posted by Alemancio View Post
Hi everyone, so I wanted to do an update now that I had another kit from G.Skill and could rule out faulty RAM.

Kits tested:
- F4-4000C17D-16GTZR
- HX440C19PB3K2/16

Computer Specs:
8600K @ 4.8Ghz / 4.5Ghz Cache
Gigabyte Z390 Aorus Master (F8 Bios)

------------

I was finally able to get a fully stable 3600Mhz 16-16-16-36 w/ 45000 tREF & 450 tRFC!

04-13-2019 09:47 AM
The Pook
Quote: Originally Posted by Alemancio View Post
Oh the irony! Yesterday before going to bed I stumbled across your settings at the original thread and since I still had my 2x8 B-Die Kingston laying around (while 4000mhz, they're CL19) I took your settings, plugged them into my Bios and guess what?



Now I come here wanting to do an update and you're posting the same thing HAHAh, you're a very good contributor to this forum. Thanks!

I had to run CL18 though, because CL17 did give some errors at 500% on Karhu. Also added 20mv to my IMC to avoid errors as well.


TL;DR - Made it (with thanks to KedarWolf) to get a hybrid setup of 2x8+2x8 to run at 4000MHz. - See quoted links

Now, I believe that I just have to call it quits on this board at 4000Mhz only 16gb (2x8). I don't see a benefit to run 32gb vs 16gb for gaming (and 3600mhz CL16 vs 4000mhz CL18) - or am I wrong?

You likely could still drop tRFC/tWR/tRAS a bit, but looks good

Run AIDA64 and compare 3600 CL16 vs 4000 CL18, but I'd probably run 4000 if all the subs are identical. My RAM benches a bit faster at 4133 16-18-18 than 4000 15-17-17.
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