chance of overclocking corsair ddr4 ram with the same CAS latency as default? - Overclock.net - An Overclocking Community

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chance of overclocking corsair ddr4 ram with the same CAS latency as default?

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post #1 of 13 (permalink) Old 04-02-2019, 03:30 PM - Thread Starter
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chance of overclocking corsair ddr4 ram with the same CAS latency as default?

hi, looking to buy corsair 2x8 gb ddr4 cl 16-18-18-36 3200mhz ram, model is CMK16GX4M2B3200C16 ,

I saw a dude overclocking these to 3500 mhz without changing the cas timings at all and with the default 1.35 volt, is this common or lucky?


Wondering if overclocking them to 3200-3600 with the default cas timings is realistic in other words for everyone, or depends on other things perhaps as motherboard/voltages for those system agent stuff in bios etc (forget what they are called exactly)


thanks
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post #2 of 13 (permalink) Old 04-02-2019, 03:45 PM
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Lucky.
3600 would usually require around c18 with the Hynix chips used in 3200c16 to get a decent OC with increased vdimm you want 3200c14 for Samsung b-die which can typically do about 3600c15 or 4000c17 with 1.4-1.45vdimm unless you get higher binned kit's using the same chips that do 3600c15 1.35v stock.
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post #3 of 13 (permalink) Old 04-02-2019, 06:28 PM - Thread Starter
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Quote: Originally Posted by Dasa View Post
Lucky.
3600 would usually require around c18 with the Hynix chips used in 3200c16 to get a decent OC with increased vdimm you want 3200c14 for Samsung b-die which can typically do about 3600c15 or 4000c17 with 1.4-1.45vdimm unless you get higher binned kit's using the same chips that do 3600c15 1.35v stock.

yeah, ive read about the samsung b-die and saw some g.skill kit cl14 3200 mhz with them, cost a fair bit more aswell I guess,


for a small OC you think going to 3333/3400 mhz from 3200 on the corsair kit mentioned earlier with hynix,
while keeping 1.35 v and 16-18-18-36 timings would be more realistic and easily attainable?


cheers
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post #4 of 13 (permalink) Old 04-02-2019, 06:31 PM
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With some extra v and some time spent tweaking you should be able to squeeze a little out of them especially if you take the time to tweak sub timings.
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post #5 of 13 (permalink) Old 04-09-2019, 05:03 PM - Thread Starter
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Quote: Originally Posted by Dasa View Post
With some extra v and some time spent tweaking you should be able to squeeze a little out of them especially if you take the time to tweak sub timings.

hello again, wanted to ask basically same question but with bit lower rated kits and starting point, if we have lets say 3000mhz cl15 kit , think it was corsair vengeance 3000mhz 15-17-17-35 rated,
how easy/likely would it be to push them to say 3200mhz with same timings or better? like 16-18-18-36 or better? and so on, I guess your previous answer still applies but like,

how common of an OC is that or more specifically how rare would it be to see that fail, if you have an approximation?


cheers and sorry if silly question
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post #6 of 13 (permalink) Old 04-09-2019, 05:43 PM
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3000c15 and 3200c16 have about the same final latency so it is a bit of a side move and should be very easy to achieve but you will only gain a little more bandwidth.
There is also a fair chance your kit will hit 3600c18 but for 3600c15 you really need samsung b die.

When you divide frequency by cas 3000c15\3200c16\3600c18 all equal 200.

Last edited by Dasa; 04-09-2019 at 05:46 PM.
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post #7 of 13 (permalink) Old 04-10-2019, 03:02 AM - Thread Starter
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Quote: Originally Posted by Dasa View Post
3000c15 and 3200c16 have about the same final latency so it is a bit of a side move and should be very easy to achieve but you will only gain a little more bandwidth.
There is also a fair chance your kit will hit 3600c18 but for 3600c15 you really need samsung b die.

When you divide frequency by cas 3000c15\3200c16\3600c18 all equal 200.

I see but thats till only just the first cas value and no other timings, wouldnt really good/good timings (if you take time to dial in all or most of them) on 3000mhz easily beat bad/mediocre timings on 3200 for example? or the slight difference in frequency makes up for that anyway?

seems hard to determine this without actually testing but hard to do before buying


if we say like this, if you had to pick something for the same price, would you pick 3000mhz cl 15-16-16 or 3200mhz 16-18-18 ? and the 3200mhz is a fair bit more expensive even in this particular case?
because to me as a noob , the 3000 mhz cl-15-16-16 seems more likely to overclock well than the 3200 mhz 16-18-18, or is that a bad way of thinking?

appreciate the help !
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post #8 of 13 (permalink) Old 04-10-2019, 03:26 AM
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Hi,
Verify the C15 timings they seem off C15 should be 15-17-17-35 not 15-16-16.

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post #9 of 13 (permalink) Old 04-10-2019, 11:10 AM - Thread Starter
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Quote: Originally Posted by ThrashZone View Post
Hi,
Verify the C15 timings they seem off C15 should be 15-17-17-35 not 15-16-16.
ye it was just kind of an example I guess, should have just said cl15 above that post I did write cl15-17-17-17-35 though
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post #10 of 13 (permalink) Old 04-10-2019, 04:56 PM
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I think you would find that 3000c15 and 3200c16 are a similar bin of the same chips so both should reach a similar level once all sub timings have been tweaked on both kit's, if anything 3200c16 may be a smidgen higher bin.
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