i7 4770k or i7 4770 with 2400MHz RAM

Deepak Kholi · Jun 24, 2014

I am looking at buying G.SKILL Trident X Series 8GB (2 x
4GB) Model F3-2400C10D-8GTX RAM for my new build.
Intel's CPU support only 1600MHz RAM.
Will i7 4770 work with above mentioned RAM and be able to use the RAM at 2400MHz ?
If yes, then please explain how.

If no, then will it work with i7 4770k. I'm not much interested in CPU overclocking but if RAM works at 2400MHz with i7 4770k then I will accept it.

Alpha3031 · Jun 24, 2014

Yes it will work, but I suggest just getting lower latency ram (maybe cas 7 or 8 at 1600)

For it to work, you'll have to manually set the speed via XMP. This will also put stress on the mem controller.

Deepak Kholi · Jun 24, 2014

With i7 4770 or i7 4770k ?

Deepak Kholi · Jun 24, 2014

Can you please briefly explain the method with i7 4770 and i7 4770k ?

Alpha3031 · Jun 24, 2014

Both, they are the same (Note: I suggest you get the 4790K it comes OC'ed out of the box to 4 GHz)

Here's a guid on how to do it http://www.anandtech.com/show/7364/memory-scaling-on-haswell/2

Deepak Kholi · Jun 24, 2014

After seeing some forums saying that CPU will automatically downclock above mentioned RAM to 1600 makes me chew over it again & again. Found that overclocking the CPU makes the memory controller to run faster and accept 1600+MHz RAM :??:

chris987 · Jun 24, 2014

for such high speed ram you will need at least a minor cpu overclocking. so 4770 non k is out of the question. 4790k having higher default speed most probably will run it out of the box but i cant confirm that. any way up to 2133mhz you wont have to o/c with any of these cpu.

Alpha3031 · Jun 24, 2014

2400 MHz is somewhat awkward, because the memory runs with a BCLK to Memory reference clock of 1:1 as opposed to 1:1.33 with most previous clocks.

Deepak Kholi · Jun 24, 2014

Thanks for the help all of you. I got my answer, i7 4770k/4790k is the way to go with 2400MHz RAM.

leeb2013 · Jun 24, 2014

Stock 3570k and xeon E3 1230 v2 both run 2133 memory at 2400 with no issues

unknownofprob · Jun 24, 2014

you don't need 2400Mhz, as the faster the speed, the ram is not "faster". As when the ram is faster, the Cas Latency (CL) is higher, the higher the CL is the slower the ram, so really there is no benefit the higher speed you go.

Haswell like fast ram yes, but what that refers to is the fastest ram with lower/est cas latency. 1866Mhz will a CL less then 9 is the sweet spot for Haswell CPU's.

Alpha3031 · Jun 24, 2014

That's not true, there are two speeds, Data transfer and latency, the 2400 is faster at data transfer. And really latency doesn't make much difference.

Deepak Kholi · Jun 24, 2014

Actually I'm getting a very sweet deal for G.SKILL TridentX 4GB pair of RAM (~$55).

I will get surely get 1866MHz RAM with <CL9 if I could find such pair.

Once again, thank you all for your help.

maktovic · Jun 24, 2014

The benefits of High-speed RAM start to diminsh rapidly after 1600MHz. If you'r going to use external Graphics card then that adds another pt. to stick with 1600 or 1866MHz RAM.

If you can find this RAM, then it will be better, will also save you some money since it will surely work with i7-4770 at its rated specs

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-14900CL8D-8GBXM
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231538

unknownofprob · Jun 26, 2014

Alpha3031 :

you saying 2400Mhz is faster?

Take a read of this quote - example-

"The frequency is expressed in Hertz, which means "cycles per second". So, the DDR3 2000 will perform 2000 cycles a second while the DDR3 1600 will do, well, 1600.

The CAS latency is given in cycles. So, a CAS9 RAM will take 9 cycles to respond and the CAS6, 6 cycles.

Now putting it together: the DDR3 2000 CAS9 will take 9/2000 seconds, which is equal to 0,0045 seconds, to respond while the DDR3 1600 CAS 6 will take 6/1600, which is equal to 0,0038 seconds, to respond. Thus, the 1600 one is faster."

Latency does make a difference thank you very much.

Alpha3031 · Jun 26, 2014

unknownofprob :

Latency wise the low cas ram is faster, but higher clocks mean higher data transfer rate, so the 2400 is faster in one way, and the other way, which is latency, does not make much of a difference with performance (especially since you can usually tighten the timings (both in clocks and ns) when/if you downclock you RAM.

unknownofprob · Jun 26, 2014

and higher CL means the more delay between cycles. As a whole, what is it worth? You aren't even going to notice the difference in the first place, hence the reason why majority of people don't bother.

leeb2013 · Jun 26, 2014

unknownofprob :

You are basing your argument on non-technical terminology like "respond" and then stating that term as being the definitive judgement as to whether ram is fast. It's not convincing.

Also, if fast clocked Ram with high latency is actually slow, why is it so expensive and used on gpus? Why don't they use DDR3 1600 on gpus?

In addition, the link below shows that latency made no difference, in fact only clock frequency made a difference in skyrim, but not latency

http://www.tomshardware.com/reviews/memory-bandwidth-latency-gaming,3409-6.html

Thank you very much

Alpha3031 · Jun 26, 2014

unknownofprob :

Between what cycles? "The majority" of people also just use DDR3 1600 CL9, hooray for bandwagon argument

geniusdevil · Feb 15, 2017

You guys saved me from an another extravagance. I visit the newegg site and I am like a kid in a candy store -- always forgetting that at the end of the month, that plastic card needs food(money)!!!

I have a ADATA PC-12800 16GB 1600mhz RAM on i7-4770K. I took a benchmark test

http://www.userbenchmark.com/UserRun/2780727

can you please see if my RAM is performing fine or not? I don't even go beyond 4GB in usage, yet i feel like it's clogging. Maybe this potato needs to be upgraded, but then it would mean to live on peanut butter sandwiches for a month. :-/ Noooooooo!!! I can't take this pain anymore!!!!

i7 4770k or i7 4770 with 2400MHz RAM

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