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After OC my RAM write speed falled down

jetraw

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Hello, guys. After then i OC my RAM, my writing speed has become lower.

I see other results in this thread , and saw, other people has symmetric result of read/write/copy on the same motherboard or CPU

I tried to bios update/downgrade, used singl/dual/quad channels, tried to used other version of AIDA64, but every time, i saw asymmetrically write speed.

When i use 1333 or 1600 mhz, my RAM speed is symmetric, READ/WRITE/COPY are same.
And also i saw, that my write speed become is lower after OC


Can you help me, it is important to me
 

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Have you tried adjusting your timings with the OC ?
You gained faster Latency which is to be expected but it will need to be offset with tighter timings also.
There is lot of gains in the tieriatary timings that can make huge gains in certain situation[ which is a whole other level]
Dave and other's have far more experience with that.
Maybe try to lower the timings one at a time and rerun the bench's till you see a further loss. ie..10 12 12 ,. 9 12 12,. 10 12 12 28,. 9 11 12, and so on
Look on the web for studying RAM timings for more in depth understanding and have some fun with it.
 

jetraw

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Have you tried adjusting your timings with the OC ?
You gained faster Latency which is to be expected but it will need to be offset with tighter timings also.
There is lot of gains in the tieriatary timings that can make huge gains in certain situation[ which is a whole other level]
Dave and other's have far more experience with that.
Maybe try to lower the timings one at a time and rerun the bench's till you see a further loss. ie..10 12 12 ,. 9 12 12,. 10 12 12 28,. 9 11 12, and so on
Look on the web for studying RAM timings for more in depth understanding and have some fun with it.
thank you for answer, Yes i tried change latency, and result is same.
Maybe ASUS motherboard have other special options?
 
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Try dialing the overclock back a bit and see if that resolves the issue
 

jetraw

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Try dialing the overclock back a bit and see if that resolves the issue
I tried set my RAM to 1866 CL13 CR1, and writing speed much more reduced, and this is strange, cause 1866 is basic clock for my 4930k like 1600/1333 mhz
 

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Why did you loosen it even more to CL13? The higher the timings the worse the performance. Try 1866mhz 9-9-9-24 1T, if that's stable increase frequency to the next step (2133mhz?) give that a go, run some stability tests and if it's still stable go up another step. At the point it starts becoming unstable is when you need to loosen the timings to regain stability, and it will normally let you go a bit faster on the frequency. For example if 2133mhz 9-9-9-24 was booting up but crashing or not passing stability tests, you could go 2133mhz 9-10-10-26 or 10-10-10-26 which might be stable. There's a point where sacrificing the timings to gain frequency won't improve your performance, or will even be detrimental so don't go too loose on timings. The command rate is done the same, if you can stick to 1T it tends to perform better, but can prevent you reaching higher frequencies, so similar to the other timings you'd loosen it to the 2T setting if you're struggling with stability.
 
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What the others above have suggested is my recommendations too. Play around with the timings. However, I had something similar happen to me a while back and it ended being an overclock that was not very stable. Same clocks, same everything. All I did was touch up the voltages and got the OC stable and I saw my RAM performance sky rocket.
 

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You are seeing a benefit but, it's not bandwidth. High memory frequencies almost always improve latency but, fast DRAM doesn't always mean more bandwidth as it really depends on the timings and how hungry the CPU is for additional memory bandwidth. The reality is that you probably need higher core clock speeds in order to saturate higher frequency DRAM and that quad-channel DDR3-1600 is more than enough to drive a 6c/12t CPU. In fact, my 3820 at DDR3-1600 literally feels no different than DDR3-2400 and I'll see very similar results that you've produced.

tl;dr: Memory isn't your bottleneck, your CPU is. I'm willing to bet higher clocks will get you higher bandwidth numbers.
 

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I tried set my RAM to 1866 CL13 CR1, and writing speed much more reduced, and this is strange, cause 1866 is basic clock for my 4930k like 1600/1333 mhz

CL 13 is pretty bad, check my signature below for the timings, that is the fastest I can get at 2400
 

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CL 13 is pretty bad, check my signature below for the timings, that is the fastest I can get at 2400
It's not as good as 10, I would hardly call it bad. The reality is that anything north of quad-channel DDR3-1600 on these chips is more than enough for these CPUs. Quad channel memory is more important when you have more cores but, with cache hit rates as high as they are nowadays, quad-channel DDR3-2400 is more than enough for just about anything on skt2011.
 

jetraw

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Hello, guys. First a want to say thank you, for help

I have the RAM: this RAM. And it works 2133 11-12-12-27 if use XMP. Corsair declares this RAM is DDR3, but it seems to me that is ddr3L, becouse i can to run this RAM to 1.35v, and I'm afraid to change voltage of the RAM more then 1.5v
also i have to say, that my XMP profile also did not work all that time.
Stable test for this RAM modules i achieved only with 2133 10-11-11-26 CR2 or 2400 12-12-12-27 CR2, and it cannot take more smaller latency.

Yesterday i tried to take symmetric speed of my RAM. I do not know what happend, i taked off the RAM modules, replaced a BIOS battery and after this my RAM showed me symmetric SPEED.

I do not know why it happened becouse i used my old BIOS setup, and did not change anything in BIOS settings.

I saved new configuration to a new ASUS O.C. profile, and again tried to change bios ram settings, after that the writing speed again reduiced,
I load my saved OC profile and writing speed increased to symmetric.

It seems to me that BIOS of my motherboard is defective.

Also i was able to test RAM 2133 and 2400 and the speed difference was small.

Now my RAM works 2133-10-11-11-26, and i'm afraid changed my BIOS settings, because i have symetric RAM speed
 

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Aquinus

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I would just use the XMP profile and call it a day then. 2400 isn't going to really be much different than 2133Mhz. Higher memory speeds are going to limit max overclocks on the CPU as well which is even more reason to just go with the XMP profile.
 

jetraw

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I would just use the XMP profile and call it a day then. 2400 isn't going to really be much different than 2133Mhz. Higher memory speeds are going to limit max overclocks on the CPU as well which is even more reason to just go with the XMP profile.
I think to use latency like XMP, without XMP, because XMP profile of my RAM set VCCSA to 1.2v, yesterday i tasted stability of my systemwithout XMP and result was good.
I want to buy nvidia volta GPU, and after that i OC my 4930k to 4.5ghz or more, maybe i returned to question about OC my RAM to 2400mhz.
And i still do not understand why my write speed is not stable even with XMP profile settings
 
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Benchmark Scores Faster than yours... I'd bet on it. :)
I would just use the XMP profile and call it a day then. 2400 isn't going to really be much different than 2133Mhz. Higher memory speeds are going to limit max overclocks on the CPU as well which is even more reason to just go with the XMP profile.
you will run out of thermal headroom before ram speeds get in the way of ambient overclocks. Nkw sub-ambient, yoy have a good point. :)
 
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