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Potential Memory OC on EVGA X299 Dark

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korser

Registered
Joined
Dec 2, 2019
Hi there, I'm bringing up some older hardware, but I was just curious on the performance of my setup in dual rank.

I currently run 4x8, 4000 cl 15-16-16-28, tRFC 260, 1.5vdimm on an EVGA X299 Dark. 1.2v VCCIO, +250 uncore offset.

I'm quite happy with this setup, but can't help but wonder what performance gains(or loss) I would have running 4x16 with similar timings?

Appreciate your time to stop by and read :)
 

EarthDog

Gulper Nozzle Co-Owner
Joined
Dec 15, 2008
Location
Buckeyes!
I wouldn't imagine much... there are some performance gains from running dual rank sticks, it isn't much. If you don't need more than 32GB right now, I wouldn't bother upgrading just for a negligible performance bump.
 

Woomack

Benching Team Leader
Joined
Jan 2, 2005
I'm not sure if you can set dual rank kits at 4000 CL15. Usually, they OC worse and are harder for memory controller, so it may end at something like 3600-3800 CL14. X299 usually can't make more than 4000-4133 with 4x8GB but I don't remember how it was working with 4x16GB.
 
OP
K

korser

Registered
Joined
Dec 2, 2019
I'm not sure if you can set dual rank kits at 4000 CL15. Usually, they OC worse and are harder for memory controller, so it may end at something like 3600-3800 CL14. X299 usually can't make more than 4000-4133 with 4x8GB but I don't remember how it was working with 4x16GB.
Yes, this is what I was suspecting. It seems the benefits from interleaving may be negated by the slower speed.

Appreciate the reply, thank you
 
OP
K

korser

Registered
Joined
Dec 2, 2019
I'm not sure if you can set dual rank kits at 4000 CL15. Usually, they OC worse and are harder for memory controller, so it may end at something like 3600-3800 CL14. X299 usually can't make more than 4000-4133 with 4x8GB but I don't remember how it was working with 4x16GB.
Hi Woomack,

Against better judgement, I did purchase two sets of F4-4000C16D-32GVKA. They seem to be a very high bin. I did not doubt what you said, but I enjoy tinkering and wanted to try my hand at reaching good speed and timing on X299 with DR sticks to daily.

Playing around with 1.55 vdimm, increasing VCCIO and Uncore offset, 4000(with decent timings) doesn't seem possible on air.

Alternatively, I'm able to play around a lot more with 3800. Currently running 3800 cl 15-14-14-28, trfc 240 and minor tweaking of other timings.
-These timings are allowed with just 1.25 VCCIO and +250 uncore offset.

My goal would be 3800 cl 14 at the moment, but having difficulty even booting up. Are you able to provide any advice?

Thank you so much
 

Woomack

Benching Team Leader
Joined
Jan 2, 2005
I would go 3600 CL13-13-13 1.55-1.60V as it's probably easier than the 3800 CL14 and the latency can be better. If I remember correctly then Kingpin was using 3600 CL13 for his world record results in 3D and it was working well for me too.
First try to stabilize CL at more relaxed other main timings and auto sub timings. After that try tightening other timings. TRFC at 240 can be a problem too. It usually loses stability below 280 but it's not a rule.
3800 CL14 may require 1.60-1.65V but hard to say. This is quad-channel so it's not always easy to stabilize at this clock and that's why I suggest a lower clock but tighter timings. It may also depend on the IMC.

G.Skill Royal 4400 CL17 is the highest Samsung B bin but it's not much better than 4000 CL15/16 kits. You may have problems finding IMC good enough to make it work at 4400 even in dual channel.
Going another way, I was testing 128GB/4x32GB Micron B at 3600 CL14-17-14 on X299 Dark. It was as hard to stabilize as Samsung B at 3600 CL13. It was also working at 3800 but I don't remember settings.
 
OP
K

korser

Registered
Joined
Dec 2, 2019
I would go 3600 CL13-13-13 1.55-1.60V as it's probably easier than the 3800 CL14 and the latency can be better. If I remember correctly then Kingpin was using 3600 CL13 for his world record results in 3D and it was working well for me too.
First try to stabilize CL at more relaxed other main timings and auto sub timings. After that try tightening other timings. TRFC at 240 can be a problem too. It usually loses stability below 280 but it's not a rule.
3800 CL14 may require 1.60-1.65V but hard to say. This is quad-channel so it's not always easy to stabilize at this clock and that's why I suggest a lower clock but tighter timings. It may also depend on the IMC.

G.Skill Royal 4400 CL17 is the highest Samsung B bin but it's not much better than 4000 CL15/16 kits. You may have problems finding IMC good enough to make it work at 4400 even in dual channel.
Going another way, I was testing 128GB/4x32GB Micron B at 3600 CL14-17-14 on X299 Dark. It was as hard to stabilize as Samsung B at 3600 CL13. It was also working at 3800 but I don't remember settings.
Wow thank you so much for that suggestion! I will try that as soon as I am able. TRFC 280+ is a good suggestion, I did not know that was a common point of stability loss. I see gains in lowering TRFC, but I would rather lower CL.

Yes with my IMC and quad channel as well, I don't expect 4000+ with DR sticks. I do hope for similar latency though which sounds possible with 3600 CL13, thank you :)
 

Woomack

Benching Team Leader
Joined
Jan 2, 2005
You can play with RTL/IOL for some additional gains but sometimes you may lose a lot of time and get not much more than what motherboard sets. Try small steps and check how the PC is acting.
 
OP
K

korser

Registered
Joined
Dec 2, 2019
You can play with RTL/IOL for some additional gains but sometimes you may lose a lot of time and get not much more than what motherboard sets. Try small steps and check how the PC is acting.
Unfortunately, I must report my efforts have been unfruitful. DR Quad Channel is quite a challenge. I really do appreciate the time you took to share your input though.

I'm not sure if its just my IMC or something, but even 3600 at 1.6vdimm I cannot get lower than CL14. I've been tinkering for a few hours now and several altogether the past couple days.

I think I will settle for 3800 CL15-15-15 and continue to adjust additional timings and see how it treats me. I may be going to back to my SR 4000 CL15s. I am not regretful though, it was a good experience. Thank you again for your assistance (y)
 

Brutal-Force

Member
Joined
Feb 22, 2009
I have Quad Channel 64GB 4266 c17 B-Die running at 3800 c16 on my x299 Dark.

I have been able to drop to 3600 c14, but you wouldn't notice any real-world benefits.

It's purely for bragging rights/benching scores.

FWIW, my Geekbench 3 Record was 3800 at CL 16.

Post magically merged:

I have Quad Channel 64GB 4266 c17 B-Die running at 3800 c16 on my x299 Dark.

I have been able to drop to 3600 c14, but you wouldn't notice any real-world benefits.

It's purely for bragging rights/benching scores.

FWIW, my Geekbench 3 Record was 3800 at CL 16. I'd hardly use those settings for a 24/7 OC.