Install high-speed memory with non-K series CPU

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drjackool

drjackool

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Dec 5, 2013
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Hi
If we have for example an Z170 or Z270 series mobo, and install i5-6600 (none-K) and install 3200MHz memory then enabling XMP, the memory will work at 3200 or 2133?

I think the memory work at 3200 because the memory controller (IMC) is placed in the uncore part of the CPU, therefore has it's own clock frequency and voltage and the non-K series processors only locks the core part. Is this correct?

Thanks
 
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Multipack
Yes you're right the memory controller is independent of the locked multiplier and can be overclocked on any CPU using a z170 board but very high frequency RAM may become unstable unless you can raise the CPU frequency as well.

You should be fine with 3200MHz but that may be a bit high. I would stick to 3000MHz at most with a locked i5. Even if you find it is unstable it'd still run at the default 2133MHz anyway, and you could manually OC to a slightly lower frequency.
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Multipack

Multipack

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Yes you're right the memory controller is independent of the locked multiplier and can be overclocked on any CPU using a z170 board but very high frequency RAM may become unstable unless you can raise the CPU frequency as well.

You should be fine with 3200MHz but that may be a bit high. I would stick to 3000MHz at most with a locked i5. Even if you find it is unstable it'd still run at the default 2133MHz anyway, and you could manually OC to a slightly lower frequency.
 
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J

Jan_26

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I am running i5-6400 with DDR4-3000, with XMP it runs without any issues, though the BIOS altered FSB up a tiny bit (st. around 101 or 103 MHz, not sure by head now). It works with zero issues. Just make sure the memory is 1.35V and not 1.5V, in long term the higher voltage could hurt.
Other that that, agreed with Multipack, 3200 is a bit too high. Up to 3000 you can get some small perf increments at more or less justificable price, above that performance increments start to be much smaller while the price skyrockets.
 
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Multipack

Multipack

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RAM frequency is fairly irrelevant anyway, as nobody has been able to produce any notable benchmarks showing a higher frequency makes any difference, and obviously the cas becomes higher with the longer relays, not that it's relevant now that the IMC has been moved from the Northbridge to the chip itself, so I wouldn't worry too much. Avoid anything over 3000MHz because your CPU clock may literally fail to keep up and BSOD.

And there is no DDR4 1.5v memory. Only 1.2v and 1.35 at XMP.
 
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J

Jan_26

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Sorry, my bad, ment to say to look for 1.2V and skip 1.35V
As for frequency/performance, there are lots of benchmarks over the internet available ;-)
 
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Multipack

Multipack

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No, all XMP is 1.35v. DDR4 has two voltage profiles. It'll run 1.2v at 2133MHz and 1.35v at XMP. Both are fine for Skylake chips, as are DDR3L 1.35v stock, provided the board has DDR3 slots obviously.

And I said notable difference lol.
 
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J

Jan_26

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Sorry, that claim is completely wrong. See tech spec:
1. http://www.corsair.com/en/vengeance-lpx-32gb-4x8gb-ddr4-dram-2800mhz-c16-memory-kit-black-cmk32gx4m4a2800c16 runs XMP at 1.2V
2. http://www.corsair.com/en/vengeance-lpx-8gb-2x4gb-ddr4-dram-4133mhz-c19-memory-kit-black-cmk8gx4m2b4133c19 runs XMP at 1.4V
 
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Multipack

Multipack

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I can assure you DDR4 XMP runs at 1.35v. 1.2 v stock. DDR3 runs at 1.65v XMP. 1.5v stock. DDR3L runs at 1.35v making it the only safe DDR3 module to use with a Skylake chip. Intel themselves have said above 1.35v damages the Skylake CPU (debated but still the official line). Kaby Lake has increased native support to 2400MHz from the 2133MHz Skylake default. You can ask any single person on this site. Take my word for it. With all due respect I dont think you should be giving advice on RAM if you tell people things like that.
 
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Multipack

Multipack

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There's nothing on there about XMP voltage, but as of Kaby Lake 2400MHz is the officially supported frequency of DDR4 and doesnt require additional voltage. Some extreme-end modules over 4000MHz may require 1.4v but it is over the recommended acceptable level of Intel's own XMP 2.0 spec

http://www.intel.co.uk/content/www/uk/en/gaming/xmp-for-core-processors.html

http://apcmag.com/ddr4-on-z170-reviews.htm/

http://www.corsair.com/en-gb/memory/vengeance-lpx-series?testedvoltage=

Anyway peace
 
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