DDR3 - FAQs and Fiction

Tradesman1 · Jul 29, 2015

Have an article that may be of use to many (I hope) that I originally titles DDR3 - FAQs and Fiction, it is in two parts,

the FAQs:

http://www.tomshardware.co.uk/ddr3-dram-faq,review-33220.html

and the Fiction:

http://www.tomshardware.com/reviews/ddr-dram-myths,4155.html

Hope this is helpful and feel free to leave comments on either or both part

Tradesman1

termathor · Aug 19, 2015

Hi there,

Thanks a lot for the FAQ and the Myth list !

Very clear and usefull !

I've been looking for answers on dual-channel on Haswell for most of the day to no avail, until I spotted this.

Tradesman1 · Aug 25, 2015

Glad it helped

patrick sunil · Sep 6, 2015

motherboard Memory Support ddr667/775 can i use 800

Tradesman1 · Sep 6, 2015

Can try and prob will be fine, DDR2 will initially downclock to the mobos default, then you can set it to 667 and possibly even 800

bpanygazi · Sep 7, 2015

good,DDR2 will initially downclock to the mobos default, then you can set it to 667 and possibly even 800

truthseekerowner · Sep 25, 2015

Thanks very useful might need to give it a second read

Tradesman1 · Sep 25, 2015

truthseekerowner :

______________

Just hoping it helps folks, DRAM is probably the least understood component in a rig

truthseekerowner · Oct 7, 2015

Hi tradesman. At the end i got an MSI 990fxa gaming + this memory F3-2133C9D-16GXH with an 8350 CPU. I read i dont need to oc, just change bios from 1600 to 2133. Is this true. How i know if something is underperforming after the change?

Tradesman1 · Oct 7, 2015

All depends on how strong the MC in your CPU is, 16GB at 2133 often requires an OC even with say a 8350. An option to that, say if you don't have a good CPU cooler is to go 1866 with them

truthseekerowner · Oct 8, 2015

I finally build my OC up. I have an issue i set the memory from auto to 2133. Even though the MSI 990fxa bios says current frequency 2133... When i go to windows speccy and cpu z reads 1066... Any idea. Shouls i enable XMP?

Tradesman1 · Oct 8, 2015

True freq is 1066, this is DOUBLE data rate (DDR) so true freq 1066 x2 = effective of 2133

(this is covered in the FAQs page

truthseekerowner · Oct 8, 2015

Yeah i know but i got confused dince it fint say x2 like in cpu core. But grat answer thanks.

sameerrgl · Oct 11, 2015

hello bro

Tradesman1 · Oct 11, 2015

sameerrgl :

___________

Yes I saw that, it's somewhat of a broad overview. When JEDEC started laying out specs for DDR3 it also began with DDR4 (a little over a decade ago), back in early 2005. The original specs only called for DDR3 to go up to 1600 then DDR4 was to pick up at 1866. The DRAM manufacturers took the DDR3 spec and just kept raising the the bar with DDR3 to 1866, 2133, etc, etc to 3000 and above. 1866 and 2133 DDR3 was out and about long before JEDEC finally issued standards for those data rates.

While specs for DDR4 differ, it's primarily the base voltage, in the referenced thread, it's mentioned 16GB sticks which do and have existed in DDR3 for awhile now (primarily in ECC based DRAM that is server/workstation) oriented.

Additionally the higher CL is directly related to the lower voltage, you can take most DDR4 and tighten down the timings by increasing the voltage.

Also, again the DRAM manufacturers have already stepped in, JEDEC spec for DDR4 go up to 3200, yet we already have seen DDR4 at 4133 with higher data rates on the way (i.e. GSkill announced a 4000 set awhile back for the Trident Z line, and already have raised the bar to 4133)

So once again JEDEC is already behind the times

Cmdfde · Nov 3, 2015

good article...really helpful. housse galaxy s6 coque protection galaxy s6

Tradesman1 · Nov 3, 2015

Thanx

HYUTS · Dec 23, 2015

Tradesman1 :

Dude amazing thread! Learned a lot in a very short time. Best info I have picked up will refer to other n00bs. Thanks a million.

Tradesman1 · Dec 23, 2015

Thanx, and no worries, DRAM is the least understood component in a rig, and we see so many threads where things are mis-stated or people just don't know, I often refer people to the particular FAQ or Fictions rather than have to type it all out over and over

turkey3_scratch · Dec 23, 2015

Always helpful Tradesman, best RAM expert on the interwebs.

Tradesman1 · Dec 23, 2015

Appreciate it

Am glad people reference it in threads, as mentioned above - saves typing/explaining

turkey3_scratch · Dec 23, 2015

I just have one quick question. If I have DDR3 RAM with the exact same frequency and latency as DDR4 RAM, what would be the differences besides voltage?

Tradesman1 · Dec 23, 2015

As in technical differences, design, there are numerous differences, voltage and CAS are what most see, the design differs

turkey3_scratch · Dec 24, 2015

Performance-wise would there be any difference? If CAS and frequency are exactly the same theoretically in the DDR3 and DDR4.

Tradesman1 · Dec 24, 2015

The DDR4 would prob be slightly better due to the newer internal design, Micron has a little chart with some:

https://www.micron.com/products/dram/ddr3-to-ddr4

DDR3 - FAQs and Fiction

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