I'm testing a 4800C18 kit on M11A and 9900k. The CPU can do 4200 12.11 (ram limit), and can boot single channel for validation 4900 in hot summer, 5000 with 20C room temp, so i assume it's a decent IMC.

Problem with the 4800 kit is that i can't boot XMP. I tried bios 1005 and bios 033. Tried both xmp profiles, with auto and manual volatages (1.45/1.6 io/sa). Tried frequency range from 4600 to 4800.

I dont't think my IMC is that week that cannot do 4600c18.

I feel like i'm missing something, like i forgot a shitty setting...

Tried trace centering on/off but did not had any impact.

With MHC Full check enabled i get stuck at b1 and with it disabled i get stuck on 23

Edited June 23, 20195 yr by miker2ka

I'm starting to think that 9900k have weaker IMC on average than i though. I managed to boot 4700 dual channel with 2 cores active.  4800 is no go. I gave the kit to a friend with m10a and 9900k but he can't boot 4700 or 4800 in dual either.

Feel free to share your experiences with 9th gen cpu and high speed ram

16 hours ago, miker2ka said:

I'm starting to think that 9900k have weaker IMC on average than i though. I managed to boot 4700 dual channel with 2 cores active.  4800 is no go. I gave the kit to a friend with m10a and 9900k but he can't boot 4700 or 4800 in dual either.

Feel free to share your experiences with 9th gen cpu and high speed ram

I agree I have a bunch of 9900k that won't do 4133 12-12 at all. Put same kit on 7740x and does 4200 12-11. 

That's weird. Never had this issue at c12 with 9900k. Played with 3, all binned, cb15 @5300 1.28-1.33v, and they all could go to 4200 c12. Only noticed big differences when going for high frequencies like 4600+

On memory side, good a1 can do 4266c12 but probly not 4800. Some a2 can do both 4266 and 4800+c14, but some can't do both freq at all ..Provided that imc could scale up.

Edited June 25, 20195 yr by dumo

On 6/25/2019 at 10:20 AM, Splave said:

I agree I have a bunch of 9900k that won't do 4133 12-12 at all. Put same kit on 7740x and does 4200 12-11. 

So we can say 9900K/9700K won't do 4133C12 and 4600-4800C14 is pretty common Allen?

10 hours ago, ivaneza said:

So we can say 9900K/9700K won't do 4133C12 and 4600-4800C14 is pretty common Allen?

From my experience it's other way around. 

Edited June 26, 20195 yr by miker2ka

On 6/25/2019 at 5:19 PM, dumo said:

On memory side, good a1 can do 4266c12 but probly not 4800. Some a2 can do both 4266 and 4800+c14, but some can't do both freq at all ..Provided that imc could scale up.

Tell us of your experiences IMC wise from tests you have done with same ram kit on 9900k and 9600k

@websmile  maybe you can tell your findings from testing lots of ram... 

Edited June 27, 20195 yr by miker2ka

On 6/25/2019 at 1:35 AM, miker2ka said:

That's weird. Never had this issue at c12 with 9900k. Played with 3, all binned, cb15 @5300 1.28-1.33v, and they all could go to 4200 c12. Only noticed big differences when going for high frequencies like 4600+

strange I could do 4800mhz 14-13 on 3 chips I tried in Gene easily on Team Group a2 maybe just you are having bad luck with cpus

Air or water? Remember he benches now at 30 ambient :)) 

 

I binned more than 50 9900k for gskill comp, the best ones on air can boot 5100 divider in dual-channel on regular ambient, i only had one chip like that that died randomly after 2 hours with 'safe' 1.5V vccsa max. 

 

Mike's 9900k won't boot with 4800c18 kit on xmp and definitely no 4800c14. On memory side, not all 4800c18 kit can do 4800c14 bench stable, eventhough it can go 5000+ with xmp settings.

Edited June 27, 20195 yr by dumo

Can you show the SPD for your kit?

1 hour ago, AutisticChris said:

Can you show the SPD for your kit?

 

Edited June 27, 20195 yr by dumo

Well, on air kit doesn't boot XMP, but with CPU at subzero it boots..... so it's an IMC issue i suppose .

If i can bench 4133 12.11 on a 9900k with 2 cores enabled, but with 8 cores ram is not stable anymore, does this mean that ram is good but IMC is weak on ambient?

17 hours ago, miker2ka said:

If i can bench 4133 12.11 on a 9900k with 2 cores enabled, but with 8 cores ram is not stable anymore, does this mean that ram is good but IMC is weak on ambient?

You need more cooling on cpu.

Heres amd sets @ 4800c14 with subs as tight as z390.

 

Edited July 30, 20195 yr by dumo

On 6/24/2019 at 1:34 PM, miker2ka said:

I'm starting to think that 9900k have weaker IMC on average than i though. I managed to boot 4700 dual channel with 2 cores active.  4800 is no go. I gave the kit to a friend with m10a and 9900k but he can't boot 4700 or 4800 in dual either.

Feel free to share your experiences with 9th gen cpu and high speed ram

I have 9900k (custom water cooling) and Asus Apex XI (bios 1401). Starting Windows is fine (xmp). But my 9900k has a weak IMC - linx test on 4800cl18 with errors.

Raising voltage does not solve the problem. The motherboard is ready, but the IMC in the existing Intel technology is not ready for such a memory frequency

Edited March 7, 20205 yr by HREN