Ryzen 3950X Build Help

[A Computer Guy]

Using both sticks of ram slots B2, and A2 @ XMP Profile 3600 MHz

had to use Ryzen Master to disable core 12, but due to symmetry had to disable more, so C4, C8, C12, and C16 are also disabled

saw the error at the same memory address as before 7641MB, but now on CPU 3:

I didn't realize about the symmetry thing when disabling cores? I did a quick test this morning and had to force update Ryzen Master I think because I'm on newer beta bios I had lost core control. I did a different approach essentially by disabling an CCX instead. I would have expected at worst case disabling #9, #10, #11, and #12 all in the same CCX. Did not anticipate you would cross CCX's but it's interesting to see the problem has shifted.

It's difficult to make a conclusion about the core #12 for me anyway because the condition of the test needed A2 and only 1 ram stick. I suppose you can say from your test it's unlikely the core is the issue.

What do you want to do now?

 

[erek]

I didn't realize about the symmetry thing when disabling cores? I did a quick test this morning and had to force update Ryzen Master I think because I'm on newer beta bios I had lost core control. I did a different approach essentially by disabling an CCX instead. I would have expected at worst case disabling #9, #10, #11, and #12 all in the same CCX. Did not anticipate you would cross CCX's but it's interesting to see the problem has shifted.

It's difficult to make a conclusion about the core #12 for me anyway because the condition of the test needed A2 and only 1 ram stick. I suppose you can say it's unlikely the core is the issue.

What do you want to do now?

Could it be the imc? Just seems I’ll be forced to rma cpu, ram and mobo still

Just got an error on cpu 23 same memory address (7641MB) after enabling all cores again

 

[A Computer Guy]

Could it be the imc? Just seems I’ll be forced to rma cpu, ram and mobo still

Just got an error on cpu 23 same memory address (7641MB) after enabling all cores again

From my point of view it's difficult to make a firm conclusion. I was trying to help you systematically eliminate possibilities. So if we accept the cores not the issue from the core shifting we observed, it could be IMC but we can't separate that from the CPU physically and test it. I'd say at DDR4-3600 sure it could very well be the the IMC cause Zen2 CPU's are spec'd for DDR4-3200 and 3600 is an OC. There will be variances as to what each CPU can do and with what combination of parts. This is why I was wanting to test with JEDEC speeds to help eliminate variables as it's the minimum standard that is supposed to work no matter what.

A way to target the IMC for testing would be indirectly by exchanging ram sticks with a consistent test. This is why I am trying to focus only 1 JEDEC speed, on the primary slot A2, and only 1 stick at a time. Change too many variables at once and it becomes too complicated to troubleshoot let alone draw any good conclusions about what part if any is the problem.

To make life simple I'd get my hands on another ram kit first and try that before RMA.

While you wait just try to enjoy your PC until the new ram arrives for you to test.

Could the memtest86 result be a false positive, sure? Personally I wouldn't settle for it but that's just me cause when something goes wrong you're going to constantly question it and by that time maybe RMA window has closed.

It might be worth the effort to contact GSkill, Asus, and Passmark and ask them if they are aware of any issue regarding testing ram with 3950x, they may simply come back with some information regarding the matter.

 

[erek]

From my point of view it's difficult to make a firm conclusion. I was trying to help you systematically eliminate possibilities. So if we accept the cores not the issue from the core shifting we observed, it could be IMC but we can't separate that from the CPU physically and test it. I'd say at DDR4-3600 sure it could very well be the the IMC cause Zen2 CPU's are spec'd for DDR4-3200 and 3600 is an OC. There will be variances as to what each CPU can do and with what combination of parts. This is why I was wanting to test with JEDEC speeds to help eliminate variables as it's the minimum standard that is supposed to work no matter what.

A way to target the IMC for testing would be indirectly by exchanging ram sticks with a consistent test. This is why I am trying to focus only 1 JEDEC speed, on the primary slot A1, and only 1 stick at a time. Change too many variables at once and it becomes too complicated to troubleshoot let alone draw any good conclusions about what part if any is the problem.

To make life simple I'd get my hands on another ram kit first and try that before RMA.

While you wait just try to enjoy your PC until the new ram arrives for you to test.

Could the memtest86 result be a false positive, sure? Personally I wouldn't settle for it but that's just me cause when something goes wrong you're going to constantly question it and by that time maybe RMA window has closed.

It might be worth the effort to contact GSkill, Asus, and Passmark and ask them if they are aware of any issue regarding testing ram with 3950x, they may simply come back with some information regarding the matter.

I did test at stock 2133 a few times and still had those issues even with additional voltage to soc 1.1v and dram 1.25v

 

[A Computer Guy]

I did test at stock 2133 a few times and still had those issues even with additional voltage to soc 1.1v and dram 1.25v

And is that still consistent with 1 stick good 1 stick bad?

 

[erek]

And is that still consistent with 1 stick good 1 stick bad?

So far only saw the one stick give an error one time individually and was unable to reproduce

 

[A Computer Guy]

So far only saw the one stick give an error one time individually and was unable to reproduce

Was that at 2133 or 3600? Sorry if I missed that detail.

 

[erek]

Was that at 2133 or 3600? Sorry if I missed that detail.

I can't remember at this point, but it took many tries to produce the error, and then not again since but still same CPU 24

 

[A Computer Guy]

Well ok you'll just have to make a judgement call on what you want to do then. Many would just try another ram kit at any hint of a ram problem.

You did have another kit if I recall? You may be able to use that to determine if your CPU and board are just fine assuming you know that ram was good to begin with.

 

[erek]

Well ok you'll just have to make a judgement call on what you want to do then. Many would just try another ram kit at any hint of a ram problem.

You did have another kit if I recall? You may be able to use that to determine if your CPU and board are just fine assuming you know that ram was good to begin with.

i tried today to just use 2 sticks of that Crucial ram in slot A2 and B2, and the results were disastrous, many errors, but a single stick seems fine in slot A2

 

[A Computer Guy]

What's the spec on that Crucial ram?

 

[erek]

What's the spec on that Crucial ram?

2400 MHz 16-16-16-39 1.2V

i even tried at 2133 MHz and it gave a lot of errors with the two sticks in A2 and B2, all different memory locations and CPUs up to 44 errors before i exited

 

[A Computer Guy]

Well that might not be bad just a configuration issue. LOL did I just say that. Well that seems like a low end kit in a high in board so a bit of a mismatch with hardware I suppose.

Have you searched in Asus forums for users with similar issues?

At this point you have some options and feedback from several people. Not sure what I can do for you other than to suggest swapping stuff around if you have other spare parts or maybe some more testing scenarios. I could try to help you get the Crucial to work in dual channel but I'm not sure it's worth the effort especially if you're going to try with a newer kit anyway which might just work. Maybe you can borrow a friends ram kit for a day. Anything DDR4-3200 may just work.

I saw the post from hardforum and Forge did have an interesting comment. As bad as it sounds RMA everything and let them figure out what is wrong is an interesting approach. If it's good they'll send it back and you can figure out what to do with it from there.

 

[erek]

Well that might not be bad just a configuration issue. LOL did I just say that. Well that seems like a low end kit in a high in board so a bit of a mismatch with hardware I suppose.

Have you searched in Asus forums for users with similar issues?

At this point you have some options and feedback from several people. Not sure what I can do for you other than to suggest swapping stuff around if you have other spare parts or maybe some more testing scenarios. I could try to help you get the Crucial to work in dual channel but I'm not sure it's worth the effort especially if you're going to try with a newer kit anyway which might just work. Maybe you can borrow a friends ram kit for a day. Anything DDR4-3200 may just work.

I saw the post from hardforum and Forge did have an interesting comment. As bad as it sounds RMA everything and let them figure out what is wrong is an interesting approach. If it's good they'll send it back and you can figure out what to do with it from there.

This is also on the QVL for my mobo and available to pickup right now: https://www.bestbuy.com/site/corsai...-desktop-memory-black/5822470.p?skuId=5822470

it's only 2x8GB kit so won't give the same memory address if it errors

should i test and return it?

 

[A Computer Guy]

CMK16GX4M2A2400C16 (forgot the version 5.xx, skhynix) yea I have that kit, in fact I have two. I had zero problems with it and it OC's to DDR4-3200 on 2 sticks just fine. That should work with Ryzen although I only tested it on my Zen+ 2600 not my Zen2 3800x.

The RGB Pro 32GB kit CMW32GX4M2C3200C16 (ver 4.32) that is also sold at Best Buy also works too (after some tweaks to tRC) and I have ram timings up on Corsair forums to help people with that model. That one I did test with my Zen2 3800x.

As long as you can return it I'd go for it and use it for testing. My first LPX kit had a dead stick but I was able to return it no problem.

Gotta sign-off for awhile. good luck.

 

[erek]

CMK16GX4M2A2400C16 (forgot the version 5.xx, skhynix) yea I have that kit, in fact I have two. I had zero problems with it and it OC's to DDR4-3200 on 2 sticks just fine. That should work with Ryzen although I only tested it on my Zen+ 2600 not my Zen2 3800x.

The RGB Pro 32GB kit CMW32GX4M2C3200C16 (ver 4.32) that is also sold at Best Buy also works too (after some tweaks to tRC) and I have ram timings up on Corsair forums to help people with that model. That one I did test with my Zen2 3800x.

As long as you can return it I'd go for it and use it for testing. My first LPX kit had a dead stick but I was able to return it no problem.

Gotta sign-off for awhile. good luck.

bought the kit, was only $57, going to test it, but also started a thread on the official PassMark MemTest86 site

RAM, CPU, or Motherboard Issue? - PassMark Support Forums

I just put together an AMD Ryzen 9 3950X build with 2x16GB G.Skill DDR4 3600MHz 16-19-19-39 modules on an Asus ROG X570 Crosshair VIII Hero (Wi-Fi). MemTest86 is consistently giving errors at the same starting Memory Address of 7641MB and usually CPU 24, but sometimes CPU 23. This is even at...

www.passmark.com

—-
Corsair 2133 passed, now testing XMP profile

 

[A Computer Guy]

bought the kit, was only $57, going to test it, but also started a thread on the official PassMark MemTest86 site

RAM, CPU, or Motherboard Issue? - PassMark Support Forums

I just put together an AMD Ryzen 9 3950X build with 2x16GB G.Skill DDR4 3600MHz 16-19-19-39 modules on an Asus ROG X570 Crosshair VIII Hero (Wi-Fi). MemTest86 is consistently giving errors at the same starting Memory Address of 7641MB and usually CPU 24, but sometimes CPU 23. This is even at...

www.passmark.com

—-
Corsair 2133 passed, now testing XMP profile

If everything works out ok and you want to try OC this ram to DDR4-3200 here is a copy of my notes for this ram kit.
Personally if it works might as well keep it as gains over 3200 can be marginal over cost.

CMK16GX4M2A2400C16 (ver5.30) DDR4-3200 (OC profile with Ryzen 5 2600 on x470)
tCL = 18
tRCD = 18
tRP = 18
tRAS = 36
tRC = 58
tRRDS = 6
tRRDL = 9
tFAW = 36
tWTRS = 4
tWTRL = 12
tWR = 12
tRDRDSCL = 6
tWRWRSCL = 6
tRFC = 560 to 580
tRFC2 = 416
tRFC4 = 256
tCWL = 18
tRTP = 10
tRDWR = 6
tWRRD = 3
tWRWRSC = 1
tWRWRSD = 7
tWRWRDD = 7
tRDRDSC = 1
tRDRDSD = 5
tRDRDDD = 5
tCKE = 8

DRAM Voltage = 1.35v
SOC Voltage between 1.018v and 1.1v
Gear Down Mode = enabled
Power Down Mode = disabled
BGS = disabled
BGS Alt = enabled
(try AUTO first) procODT = 53ohms or 60ohms
(try AUTO first) RTT_NOM = RZQ/7(34)
(try AUTO first) RTT_WR = RZQ/3(80)
(try AUTO first) RTT_PARK = RZQ/1(240)
(try AUTO first) CAD_BUS ClkDrv = 24 ohm
(try AUTO first) CAD_BUS AddrCmdDrv = 24 ohm
(try AUTO first) CAD_BUS CsOdtDrv = 24 ohm
(try AUTO first) CAD_BUS CkeDrv = 24 ohm

Note for Corsair the version number next to the model number is very important, if your version is different then what is specified here do not apply these settings as they probably will not work.

 

[erek]

The Corsair memory passed even at XMP, so i'm pretty glad for that. Hopefully can get back to 3600 MHz 2x16GB G.Skill kit after RMA. Thank you everyone for the support and help so far

 

[A Computer Guy]

Hey that's great news and an awesome build, have fun!

 

[oxrufiioxo]

Super happy to hear that.... I've had to swap out identical kits a couple times on 1000/2000/3000 so I'm sure the new ram will work just fine.

I've never used 16GB dual rank dimms though so i'm not sure how they behave I would imagine they're more complicated to make and maybe that would lead to a higher rate of rma's with them.

 

[erek]

Super happy to hear that.... I've had to swap out identical kits a couple times on 1000/2000/3000 so I'm sure the new ram will work just fine.

for $57, pretty decent price for 16GB of ram even though it's only rated for 3000 MHz, i can at least play some games and watch some YouTube, etc

with just a single stick of 8GB i was hitting 50% of that just loading up chrome and steam

so thankful to have just a stable temporary setup for now, but is 1800 MHz Infinity Fabric the ideal target?

1800 MHz FCLK and 3600 MHz DDR4, is that the sweet spot?

 

[A Computer Guy]

for $57, pretty decent price for 16GB of ram even though it's only rated for 3000 MHz, i can at least play some games and watch some YouTube, etc

with just a single stick of 8GB i was hitting 50% of that just loading up chrome and steam

so thankful to have just a stable temporary setup for now, but is 1800 MHz Infinity Fabric the ideal target?

1800 MHz FCLK and 3600 MHz DDR4, is that the sweet spot?

Yes,

also...1900 MHz FCLK and 3800 MHz DDR4 is better but not all CPU's can do that. buildzoid has a nice video on the topic.

At DDR4-3000 you can still decouple FCLK and ramp it up to 1800MHz for a bit of a boost when stuck at lower DRAM frequencies.

 

[oxrufiioxo]

for $57, pretty decent price for 16GB of ram even though it's only rated for 3000 MHz, i can at least play some games and watch some YouTube, etc

with just a single stick of 8GB i was hitting 50% of that just loading up chrome and steam

so thankful to have just a stable temporary setup for now, but is 1800 MHz Infinity Fabric the ideal target?

1800 MHz FCLK and 3600 MHz DDR4, is that the sweet spot?

For gaming specifically there isn't a difference at 1440P going from 3200 14-14-14-28 to 3800 16-16-16-32 in any game I've tested you'd need to drop to 720p with your 2080 ti to get gains..... Higher latency ram i cannot speak for but the looser your timings the more a higher FCLK will help you I would imagine.

You seem to game at 60hz not sure what else you do but even the 3000 corsair kit you have will be more than enough for that.

 

[erek]

For gaming specifically there isn't a difference at 1440P going from 3200 14-14-14-28 to 3800 16-16-16-32 in any game I've tested you'd need to drop to 720p with your 2080 ti to get gains..... Higher latency ram i cannot speak for but the looser your timings the more a higher FCLK will help you I would imagine.

You seem to game at 60hz not sure what else you do but even the 3000 corsair kit you have will be more than enough for that.

FreeSync 1 Monitor also,

see before with my X99 build i didn't buy higher end performance ram and honestly didn't even use XMP, so i was literally running 2133 MHz, so with this build i went out of my way to buy higher end memory with good timings

interesting thing is even at 2133 MHz I was pretty much a happy camper and none the wiser... didn't even know what XMP was to be honest, if i'm being honest... i'm not really into overclocking so i left those settings alone until now

 

[oxrufiioxo]

FreeSync 1 Monitor also,

see before with my X99 build i didn't buy higher end performance ram and honestly didn't even use XMP, so i was literally running 2133 MHz, so with this build i went out of my way to buy higher end memory with good timings

interesting thing is even at 2133 MHz I was pretty much a happy camper and none the wiser... didn't even know what XMP was to be honest, if i'm being honest... i'm not really into overclocking so i left those settings alone until now

Well you bought the 16 core...

a nearly $400 mobo..

Have a 2080 ti...

pairing it with budget ram seems kinda like a disservice lol.

I would still get back to 3600 16-19-19-39 at a min.