If one plans to overclock a i5 4670k, should the ram speed be relevant? (1600mhz x 1866mhz)

rickzor · May 23, 2014

So i've heard that "k" stand for an unlocked cpu, meaning the multiplier is unlocked and i can overclock the cpu without messing with the ram speed. How correct is this?
If so, and if i could get these rams bellow for a similar price, which would you advice if a cpu overclock was planned?

Kingston DDR3 HyperX FURY White 2x8GB 1866MHz Cas10

Kingston DDR3 HyperX 2x8192MB (16GB) 1600MHz Cas10

I wouldn't want to be limited on the overclock by the ram speed, so speak out your thoughs about this.

EasyLover · May 23, 2014

RAM speed will be adjusted during the CPU overclocking because of FSB considerations.

None of these RAMs. Consider buying G.Skill series RAM with 1866MHz or more as these RAMs are of good quality and less expensive. With Haswell, you'll be benefited with more speeds in RAM.

photonboy · May 23, 2014

1) For gaming, 1600MHz is generally plenty. For some intensive non-gaming tasks you may benefit from faster memory.

2) The CAS number also matters. Lower is better, so 1600MHz CAS9 is potentially faster than 1600MHz CAS10.

3) You SHOULD in general not go above recommended memory settings (don't overclock the memory) for stability and because it rarely matters.

4) Intel Haswell CPU's (i.e. i5-4670K) can be adversely affected over time if the memory setting chosen is higher than 1.5Volts. Google if you wish.

So I recommend buying a memory kit that says something like "1600MHz CAS9 1.5V"

rickzor · May 23, 2014

Problem is that i need a low profile ram due to the existing cpu cooler.
Also, why not Kingston rams? I though they were good, aren't they?

G.skill and others aren't cheaper were i need to get them (keep in mind i need to get them at a local store for other reasons) and they tend to be high profile rams that would hit the cpu heatsink.

Are any of these kingston rams really a bad pick?

rickzor · May 23, 2014

photonboy :

I've found these G.Skill Ripjaws X DDR3 2x8GB 1866MHz CAS9 1.5v for an appealing price, but i'm worried if they would hit the cooler or not.

The motherboard is a Asus Z97-A Intel Z97 SK1150 and the cooler is a Noctua NH-U9B SE2 (i5 e i7 ready).

Seems to be pretty tight..

EasyLover · May 23, 2014

You may encounter ram clearance issue. Better stick with low profile rams. Kingston rams are not bad but G.Skill have good quality rams. You may check their low profile rams.

Tradesman1 · May 23, 2014

I myself also prefer GSkill and w/ Haswell would look to 1866/9 anyway (basically the same price as 1600 sets) and you gain the wider bandwidth, would prob look at the GSkill Snipers in 1866/9....also with your cooler, that's one of the Noctuas that has adjustable fans so DRAM clearance isn't as big a deal as with some coolers:

http://www.noctua.at/main.php?show=faqs&step=2&products_id=32&lng=en#9

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If one plans to overclock a i5 4670k, should the ram speed be relevant? (1600mhz x 1866mhz)

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