G.kill Ripjaws 1600mhz or 2133mhz? Buying tomorrow!

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Soluv

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Apr 29, 2013
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Hello!

Im buing a new PC tomorrow and i have 2 sets of ram to go with about the same price:

8GB G.Skill Ripjaws X Performance - 1600MHz DDR3 (9-9-9-24-2N) 1.5v
or
8GB G.Skill Ripjaws Gaming - DDR3 2133MHz DDR3 (11-11-11-30-2N) 1.5v-1.6v

So which one should i go for? I have read that 1600MHz is more stable AND since it has better Cas-latency, will there be much difference in speed?

and 2133MHz memory is 1.5-1.6v and i would like it to perform at 1.5v because it's recommended by intel, so can it run 2133Mhz with 1.5 voltage?

Processor: Intel i5 3750k
Motherboard: ASUS P8Z77-LK

Im sorry if this is a stupid question, but i really can't decide and im buying one or the other tomorrow..
 
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DarkSable

DarkSable

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Sep 27, 2012
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Leo, sorry, but it won't be faster, no.

Intel gets pretty much zero benefit from ram that's faster than 1600 MHz, which means you want ram with lower Cas latency.

You also want 1.5v ram; not certain about if the 2133 will run at that, but I wouldn't waste the money on it anyways.
 
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raytseng

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May 15, 2012
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Respectfully disagree with above analysis, as the missing piece of the puzzle is you do not know the specifications for the ram when they are running at the same speed

even though
8GB G.Skill Ripjaws Gaming - DDR3 2133MHz DDR3 (11-11-11-30-2N) 1.5v-1.6v
@2133 has CAS timings of 11, you do not know it's CAS timings if you were to set it at 1600. It can be the same or equal to the other RAM.

In other words, just because it says CAS11@2133, doesn't mean it is CAS11@1600.

Likely it won't matter in the long run and either choice will work.
 
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DarkSable

DarkSable

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Sep 27, 2012
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Even if it has the exact same CAS timings at 1600MHz, why would you pay more for it?
 
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jonnylooc

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Apr 29, 2013
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If they are the same price then you should probably get the 2133.

the timings are less important than frequency now. or so I am lead to believe this.

two reasons for that. Firstly, the memory controllers are better now and more efficient and they are more able to avoid the latencies when accessing.

secondly, as timings already are high on most ddr3 at 1600, increasing them leads to diminishing performance loss.

you can see here evidence of this

http://www.xbitlabs.com/articles/memory/display/ivy-bridge-ddr3_3.html

also here

http://www.xbitlabs.com/articles/memory/display/sandy-bridge-ddr3_4.html

finally, my last piece of evidence is here

http://www.xbitlabs.com/articles/graphics/display/amd-trinity-graphics_8.html

here decent 1866 loses in a big way to loose 2133.

all that said. it seems to be, based on what I have read, that if you are not using your processor's integrated graphics processor, then the memory frequency will have very little performance impact. other than that specific case, it's really only capacity that makes the difference. everything else is not so important. timings matter less than the frequency with which the memory runs at.

higher frequency memory should run just fine at lower frequency.

this is an edit:

I would also like to add that your 2133 most likely has an xmp profile which runs it at 1600 or so. and failing that, will definitely have an spd profile which will run it at 1333. so, in order to run it at 2133, you would likely have to set it yourself anyway.

once again, you're not likely to notice a performance difference except in the particular case of using the igp, in which case the performance increase is really very larger. I'd probably get the 2133 just for the extra headroom. but you could get either or if you have a graphics card.
 
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Soluv

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Apr 29, 2013
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Thank you all for feedback!

I went with the 2133MHz ram then.

My voltages show:

JEDEC #5: 1.5v
JEDEC #6: 1.5v
XMP-2134: 1.600v
XMP-2132: 1.600v

Are these numbers good or do i need to change something?
Thanks again for the feedback!
 
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gskill support

gskill support

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Feb 27, 2012
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Soluv,

If you are looking in a program like CPU-z, make sure to look in the memory tab, not the SPD tab. The JEDEC and XMP values you listed are not actual live values. The set of values in effect will be under the memory tab. Check that to see operating DRAM frequency and timings. For voltage, you need to check BIOS, there should be a section that displays current voltage. The DRAM frequency and timings should also be checked in BIOS if they were not correct in the memory tab of CPU-z. The DDR3-2133 kit is very good, better than the DDR3-1600 kit, so you should be able to achieve very good results.

Thank you
GSKILL SUPPORT
 
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Soluv

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Apr 29, 2013
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I checked BIOS and put the Ai Overclock Tuner to X.M.P
and the voltages are:

CPU: 1.024
DRAM: 1.600V
VCCSA 0.925V
PCH: 1.050V

are these good values or should i tweak them manually? (Considering Intel recommends DRAM Voltage of 1.5V)

I have a decend CPU cooler tho if that helps
 
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Soluv

Honorable
Apr 29, 2013
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And if i set the voltage to 1.5 - 1.575 manually, will it run at 2133MHz and with correct timings? Will it be slower? Or just tune it down to 1866Mhz or so with 1.5v? Or is 1.6v still safe on ivy?
Please respond since i don't want to fry the CPU and i just bought a new machine.

ps. It's at X.M.P Profile right now
Intel Core i5 3570k: OC to 4100Mhz
RAM speed at 2133Mhz 1.6V

motherboard: ASUS P8Z77-LK
 
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DarkSable

DarkSable

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Sep 27, 2012
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If it will boot with a voltage like that, then no, it's not going to run any slower - it's just a question of if it CAN run at that voltage. Give it a try, and see.

1.6v isn't recommended, but it's not guaranteed to kill your processor, either. That being said, I'd play with it and see how low I can get it to boot at. (*and maintain stability, obviously.)
 
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Llantant

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May 10, 2013
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Llantant

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May 10, 2013
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You won't notice a difference in real world usage or gaming really. But hey they are the se price. Go for the 2133. I bought a pair of 1866 9/8/8/24 2t because they were cheaper than a 1600 set cl9. I have run these at 1600 cl7, 1866 cl8 and currently running at 2133mhz 10/10/10/30 2t @ 1.5v! With 1.1v VCCIO. That's my favourite setting. 24gb+ maxxmem, 45 latency. All without a voltage bump to the ram.

I love g skill!!!!
 
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