i7 8700k with 4500Mhz Dimm

Anlaf Cununc

Anlaf Cununc

Anlaf Cununc

Associate
Joined
1 Dec 2017
Posts
35
Hey guys, so recently I bought this RAM from overclockers to run it on my Asus Maximus X Apex motherboard. The RAM works perfectly fine on 2133MHZ but when I use the xmp i.e.
  • 4500MHz RAM Speed
  • CAS 18-20-20-44 Timings
  • 1.45v VDIMM

The PC then doesn't even boot. Can someone let me know why this might be happening? Why won't it work when that 8Pack has specified? I am using 8700k with it too
 
Ian Parry from 8pack says it could be imc for code 55?

This is what he said

It's not the ram issue though it's the cpu imc. 55 tends to mean the memory can reach the frequency but needs tuning. In this case we know the board is fine to run the memory so must be cpu imc.

Regards
 
Cpu socket pins - pins are fine I checked those before I installed the cpu
Ram socket - is fine my other ram is working fine on it
Warped board - board is fine too

If IMC is cpu based then I cannot do much about it can I? I wasn't expecting to do all this as I have never overclocked RAM before. In the past I just used xmp and that had worked fine. I was recommended this board by someone at overclockers to work with my CPU and this ram. They told me that this ram had been tested with Asus Maximux X Apex and with 8700k with using just the xmp? I had to order another pair of the same RAM to make sure it wasn't the RAM that was faulty. Both of them failed to work with the XMP and I had to spend all this money based on Overclockers recommendation. Now I am having to send 2 pairs of these dimms back as I am not able to get them to work.
 
Yes but CPUs work fine on default settings. This RAM comes with advertised 4500MHz. 8700k comes with advertised 3.7GHz with turbo at 4.7GHz. Now you cannot make the same comparison as you get what you see on the tin with 8700k but not so with this ram. Here is the qvl list and it doesn't show this RAM there either list
 
Yes like I said 3.7GHz is default and 4.7GHz is turbo stable. From RAMs I have tested before default is 2133 and xmp is like the turbo on a cpu which works without having to overclock. I was recommended this RAM by overclockers and wasn't told anything about imc and timings etc. After a lot of waste of time and money I had to post this on here to get some knowledge on the issue. Now I have been told to do specific changes to the RAM to get an optimum frequency so I am not getting what it says on the tin? I have no idea how to select what timings plus it is highly frustrating and time consuming to learn all of this.
 
I will post next week your configuration running fine.
Click to expand...

Will you do it for the same setup 8700k with ASUS Maximus X Apex?

with the following speeds as it says on the tin?
  • 4500MHz RAM Speed
  • CAS 18-20-20-44 Timings
  • 1.45v VDIMM
Would like to see if it does work then I will buy that 8700k off you. Bu if you are going to be using lower speeds then or higher timings then whats the point?
 
Danny75 said:
That's the default speed and anything above that is considered an overclock. The speed also depends on the motherboard (which is why some motherboards show their own speeds, higher than that), as well as the strength of the IMC on your particular chip as has been said.

Honestly, if you don't know this stuff and have no interest in it, then send it back. This high frequency RAM which may or may not operate at max rated frequency depending on board/your chip (silicon lottery) is aimed more at enthusiasts.
Click to expand...

Well that is something Overclockers should have told me though. I was shocked by the level of advice I was given even after I told them about the issue. Yeah I guess 3600 would be a better choiec
 
Jay343434 said:
Have you not tried a slightly lower speed? A couple of hundred Mhz isn't going to make a difference in performance.

If you're adamant on 4500Mhz you can try increasing VCCSA and VCCIO voltages. Try setting both of them to 1.2v. Realistically they're going to need to be minimum 1.15v to run ram at that speed.

I assume they're on auto, so what is the motherboard setting the voltage at?

The Apex (and high end itx boards) is pretty much as good as it get's in terms of memory overclocks due to having only 2 dimm slots, so you've got a good foundation. But it comes across as though you're not willing to try and tweak anything.

While we'd all love for everything to be plug and play, it often rarely is with PC's lol.
Click to expand...

I tried 4400 with same timings and 1.45v. That didnt boot. Tried the 4266 too and that didnt boot. Tried with higher voltage and that didnt work either. Then i gave up as going further down was simply not worth the money. I could buy a cheaper dimm which would possibly achieve that.

I see people keep comparing this to supercars. At least supercars turn on as soon as you turn the key or click a button. This RAM is not plug and play whereas supercars are good to go when you buy them.
 
Jay343434 said:
What voltage did you increase out of interest? The ram voltage? It probably isn't the ram that's the problem, and it likely won't be the motherboard, it's probably the IMC on the CPU. 4500MHz is really pushing things.

Try and increase the VCCSA and VCCIO voltage, I know it's frustrating but it won't take long to make those adjustments.

I'd be interested in knowing what those voltages are set to currently.

The issue with ram being sold at certain frequencies is even if the ram has been confirmed working at specific timings and frequency, it's reliant on other hardware in order to reach those speeds. Anything above 2666Mhz on the 8th gen is classed as an overclock so there's no guarantee someone will be able to achieve anything over that.

Despite that I honestly think you'll get there, you've got a damn good board, I think the IMC just needs a little more voltage, VCCIO (and VCSSA) are the key I think.....Increasing the ram voltage isn't going to get you anywhere in my opinion.
Click to expand...

I went as high as 1.2 on vccio and 1.2 on VCSSA. Didnt know what I was doing so thought that was fairly high. Do you think getting it to 1.3 would the next step,?
 
Ok so after doing loads of tinkering I got the RAM to boot at 4300 MHz with 18-18-18-38 timings at 1.44V now I am not sure if this means good or bad but reading a bit about timings I have gathered less means better am I right in assuming this? If yes then can someone tell me if I can make the time lower? I am glad it is working at 4300 though which still decent so if you guys have any more suggestion then I am ears. Thanks
 
8 Pack said:
Probably twcl, trfc or rtl issue stopping higher boot.

On a four dimmer board 3866 is really all you can hope for.

Also cpu imc comes into it and associated voltages too high or low. For 3600 - 3866 try 1.15 Vccio 1,2 Vccsa and 1.15 cpu standby voltage.

16-16-38 and 18-20-41 respectively. V dimm 1.45v
Click to expand...

Hello again, I recently got my 5950x and started using these 4500 dimms on this new setup with AsusTUF gaming x570-plus. I was able to get 4300mhz with 18-18-38 timings with 8700k but am unable to get those numbers with a cpu which is so much powerful than 8700k? Would like to know what I can do to get these numbers again?
 
8 Pack said:
Absolutely no point running 4k....divider on infinity fabric...

RAM test is great test programme.
Click to expand...

Lol I guess you were right when you said I bought a ferrari when I am only good and riding a bicycle. Can you please let me know why 4k won't be good? Will it be better if I run lower frequency with lower and tighter timings?
 
You must log in or register to reply here.
Back
Top Bottom