i7 8700k with 4500Mhz Dimm

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.
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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.
 
Anlaf Cununc said:
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.
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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.
 
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Anlaf Cununc said:
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.
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The ram works too, just doesn't go as fast as 8pack could get it... Same with supercars and good drivers.
 
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.
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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
 
Yeah the tighter (lower) the timings are, the better.

To be honest what you've managed is pretty good. Infact it's very good. The best thing to do know is wait for @8 Pack to come back with his settings using your board and ram and you can test it out. As you may be aware he know's his stuff (he's set world records for overclocking etc)

The reality might be that your IMC just isn't capable of running the ram any higher. Even if that is the case 4300Mhz is very nice, especially with those timings.
 
I will try this later on in the week. Untill then I can't due to being out of the office.

These dimms like 18-18-18 as you have spotted. They for me reach higher frequency at these timings than 18-20-20. Gskill like 18-20 but lose performance. Trcd 18 is very low at 4300 and is beating 4500 18-20 very easy.

The problem with all this very high end stuff is each imc is different. End users wanting this often get me to bin imc and make them a bundle. Then all elements are pre tested and it's very simple to use.
 
hi i have Trident Z 16GB (2x8GB) DDR4 PC4-3200C19 4000MHz Dual Channel Kit (F4-4000C19D-16GTZKW) and it sometimes does boot on xmp but then my game fails after a few minutes with extreme stuttering and lag then crash, on the previous bios it would not boot at all on xmp 4000mhz so maybe after some time the bios will be updated enough for it to work properly, i noticed the northbridge runs at max 4000mhz but if ram runs the same to there is no head room above that, my cpu is i7 8700k and motherboard asus tuf z370 plus gaming advertised ram speed 4000mhz specs say 3866mhz, but regardless i cant get ram past 3200mhz unless on xmp, i assume there must be something in the bios i need to alter, but i am assuming that it would be automatic for the speed i set, i also ran windows memtest which past the test without a problem.... so i am at a loss, i have tried the load optimal settings and reset ect but no joy...
 
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
 
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
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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?
 
Absolutely no point running 4k....divider on infinity fabric...

RAM test is great test programme.
 
8 Pack said:
Absolutely no point running 4k....divider on infinity fabric...

RAM test is great test programme.
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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?
 
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