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Zadak 511 Shield DDR4-4133C18 short review


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Zadak 511 Shield DDR4-4133C18 short review


Welcome to my first look at Zadak 511s 2x8GB Shield DDR4-4133 C18 memory kit.

Let´s talk first about Zadak 511, it is a new name for most of us. The company is a new division of Apacer which has specialized on highend gaming components and modding. It offers pc memory, ssds and pc-modding devices and already drew some attention with sponsoring the hardwarebot world tour stage at computex as well as with its extravagant products and web presence.



Specifications and first impression

Part number ZD4-SHK4133C18-08GAS

XMP DDR4-4133 C18-20-20-48 1,40 Volt


jd801473czs4q.jpg jd8014707ya29.jpg


The sticks use a black pcb labelled B84URCA2 HF 0.30 with eight 1 GB Chips which are located at one side of the pcb. The used ics are produced by Samsung and labelled K4ABG08-5WB BCPB which tells us that these are the so called B-die Samsung which are famous for their excellent overclocking behaviour. The SPD of the sticks has several JEDEC approved profiles which make it boot up at DDR4-2400 C17-17-17-39 1,20v on default, which is one step above the usual 2133 other vendors usually use. Generally it is clear Zadak 511 uses highend quality components, the pcb and chip position on it are non default though, a fact we will talk about later.





CPU Intel Core i5 7600K retail

Mainboard Asrock Z170M OC Formula

Memory Zadak 511 Shield DDR4-4133C18

VGA KFA² Geforce GTX275

PSU Mushkin AP 800W


Inserting the sticks for the first time we had saw it boot up at DDR4-2400 C17 1,20v without problems, we then enabled the XMP which did work flawless. The rated DDR4-4133 C18-20-20-48 worked at first try for us and were memtest stable.

We then started to evaluate lowest possible voltage for the XMP but moved on very fast to also tighten main timings at same time because it was easy to see the memory could do a lot more than advertised. We ended up at 4133 C18-18-18-48 at 1,35v and did not bother to lower voltage more but moved on to check some possible daily settings within the safe range of 1,40v the kit is specified for




DDR4-4000 17-17-17-39 1,35v worked easily, to demonstrate stability we did not only use Dos memtest this time but made a run of more than one hour using HCI memtest for windows which worked fine.




Then we moved up again to DDR4-4133, the timings of 17-17-17-39 provided no challenge for us even at 1T command rate, Dos memtest and Superpi 32m as well as other tests worked easily





Afterwards we moved up in frequency and reached around 4220 17-17-17-36 at 1,45-1,47v. This is an awesome result for low voltage at Command rate 1T and quite tight settings.




Bench tests


Being a passionate member of hwbot.org and addicted to benching, I decided to give the sticks a go for hardcore performance tests at a combination of high frequency and tight timings. No need to emphasize that this takes a lot of voltage and is risky, apart from this it voids your warranty at least in theory.


Benchmarks used were superpi32m, xtu, geekbench3, legacy Futuremark benchmarks like 3DM01-06 and a few more. Above 1,45v my mainboard starts to overvolt the dram in relation to BIOS settings, so take in that the 1,87v max used for the results are around 1,92-1,93v real.


I did a couple of fast tests at 3600 and 3733 C12-12-12-28 220 1T, this worked easily so I moved on to DDR4-3866. At this frequency all used benchmarks worked at 12-12-12-28 220 1T around 1,76-1,78v BIOS, real 1,8-1,82v, 12-11-11-28 worked at same voltage


3866gb12-11176vwtabi.jpg 275gtxkfa06cujpz.jpg



Encouraged by the very good results up to this point, I moved to DDR4-4000 – and failed at this divider at Cas12. No matter what I tried, varying all subtimings, twcl, TRCD and so on including command rate, RTL and IOL settings and tertiaries up to slopes and obscure settings, at DDR4-4000 divider at 100BCLK I failed boot. So I moved down to DDR4-3866 and worked my way up with BCLK, and finally reached a bench stable setting of around DDR4-4000 12-12-12-28 220 1T at 1,87v BIOS, 1,92-1,93v real.


398012-1232m186vsso8.jpg 200012-12gb186testw.jpg



On a side note, I personally see the reaon for this at the used PCB and IC configuration. A couple of weeks ago I was able to test some Apacer DDR4-3733C17 which also used Samsung B-die and had the same PCB and IC-placement the Zadak now have. These encountered exact the same problems on various boards and cpus I used. It seems that this configuration, which is very uncommon and different from all kits from different vendors and bins I tested up to date, is a handbrake for benchmarking at extreme high frequency at low cas. I rule out the quality of ics and pcb itself, as these are best of brand components for sure, also the spd, which was different on the kits I tested at this ic layout was different. This makes the Zadak, which are the best gaming and 24/7 memory kit I tested so far only semi useful for highend benching at heavy duty at least for me. Of course there is always a possibility me as tester or my components fail, but this happened now only 2 times with kits which had the exact same configuration, the more than 100 kits I tested from different vendors never showed a similar problem, and I can rule out voltage tolerance because being desperate I even tried 1,95v in BIOS to check this and the kit posted, entered windows and worked without problems at 3866 divider 12-11.



Facit and rating


We still do not know the retail price of this kit, so I cannot comment on price performance rating. Vendors with comparable bins sell these in Europe at 250-300 Euros for 2x8GB at the moment.

The optics are awesome, the options for daily use within rated voltage are best I saw so far. If these hit retail and keep quality this sample shows, they are highly recommended for gaming systems for highend loving enthusiasts as they offer complete stability at low voltage with good timings at 4000 and 4133 and even above. For heavy benchmark duty like semi pro and pro oc effort at hwbot or other competitive benchmark sites, I can only recommend them partially, They are completely stable at 3866 12-11 tight at a relatively low voltage, with bclk oc you can get them stable near 4000 c12, but the problem that I could not use them at 4000 and higher using this divider is a serious handicap for benchers.

In the end I can give a limited recommendation for benchmark use and a 100% recommendation for daily use and especially best of brand gaming systems on which you want to go for the limits and above.


Thanks to Erin Chou and Zadak 511 for providing these beautiful memory sticks and thanks for reading

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The quality of components is beyond doubt, highend stuff, in my opinion the change to a standard pcb layout would change the c12 problem. As usual, I assumd fail by me or my hardware first, even after the experience with the Apacer3733, but I got feedback that practically all guys who have these layout samples have even worse problems at c12 than me... These are very good mems, but with limited use for hardcore benching, it will be Zadak511s decision if they want to change it or not

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As said, playing with bclk works, I can run 4k but not boot. It also works if I lower bclk at 4000 divider, the downside on this is that you need voltage overshoot and stability for Spi32m is a bit worse than usual. Waza still did work but needed around 1,96v real then


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Nowhere atm, they are not listed yet, initially it was planned to release a series a couple of months ago but Zadak still needs feedback to perfectionize the layout, so I hope me and some other guys(especially Rule who did very much test work) could help at this :)

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  • 7 months later...
  • 1 year later...
On 3/19/2019 at 9:37 AM, websmile said:

I sold my kit because I got practically zero feedback by Zadak and it became clear that there obviously was no interest in any kind of longer partnership. They are in Japan now^^

is zadak still around? they have the double  capacity sticks for z390



haven't seen these elsewhere yet

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15 hours ago, zeropluszero said:

I sold off my sticks as well, fatboynotsoslim still has one of the frequency sticks and I'm keen to get my hands on it again when I can. 


I have been reading on their site, i think, that they are going to be launching in the EU and US sometime the beginning of this year but.. its already march

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