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Noxinite

Samsung DDR3 G-die

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Hello peoples.:D

I had a random stick of OEM Samsung DDR3 lying around and decided to try it out as a laugh. Funnily enough it would boot 2800C9 @2V and then I realised it was 2GB ds as well - huh. So I tried tightening timings and found that (unlike the typical d-die 4GB ds sticks) :

  • RP was weaker.
  • RFC was stronger.
  • RDRD set at 4 is actually possible and stable. ūüėģ
  • The three RDWR timings can be set tighter as well.

I bought some more 2GB ds sticks to test and even some 1GB ss sticks. The 1GB sticks clock a lot better than the 2GB sticks, however the performance is awful in 32M (as they are single sided). No noticeable improvements in tightening timings over the 2GB ds sticks either. I also did do some quick POST memory frequency testing and got +3600MHz working in dual channel with CPU on phase.

I have tried 4 sticks of the 2GB ds variety on phase so far and all have worked fine at those temps (around -40C to -35C). Unfortunately I overwrote an XP image that had a lot of my phase testing results on and have been busy with Team Cup so do not have much to show for that atm. :(

I'm also seemingly having issues with the Impact VII I'm using atm with high freq ram (>2880MHz), but it might just need some more patience. :D And also my OCF is half-dead so atm I can't test on that board.

So here is the best ambient result I have so far, 2GB sticks first (the efficiency seems a bit off so I need to test some more):

1587469596_2800C832M-W2.35V(2).thumb.png.6be9a954593caf440e7777d691d32d4a.png

1GB sticks (G3258, so on i7 will be ~1.5s faster):

snap-12.31-23_57.thumb.png.b60cd3c3762ed9551215440684cee191.png

 

And this is the only phase result I seem to have (although I'm sure I passed 2933C8 in single channel in my first round of phase testing):

1355586143_2873C8-2.40V-32MW.thumb.png.efb52e4b3f541d2fece26b4d7e9ff01d.png

Edited by Noxinite
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As I said in the other thread: I've seen Samsung 1Gbit G-die do 1400 9-12-12 before and I've seen these chips on 2GB G.Skill 1333C9/1600C9-rated modules from 2011-2012.

So who knows, maybe somewhere in the wild there is a G-die set on proper PCB that is capable of 1466 8-12-12 with tRFC of just 88 :D

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Crazy to think that there may be really good ICs out there that nobody has tested because they were too busy binning d-die, psc, bbse, etc.

Well done on testing, and will be interesting to see what comes of this IC once you and other have more time to test!

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Better not test this properly,you will make my collection of Samsung become irrelevant :)).

Can you make 2 runs on same os ,identical settings so we know how much they loose from density, and after “ tight “ on both at 2800 mhz ?

Edited by suzuki
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16 minutes ago, TaPaKaH said:

As I said in the other thread: I've seen Samsung 1Gbit G-die do 1400 9-12-12 before and I've seen these chips on 2GB G.Skill 1333C9/1600C9-rated modules from 2011-2012.

So who knows, maybe somewhere in the wild there is a G-die set on proper PCB that is capable of 1466 8-12-12 with tRFC of just 88 :D

I had a quick look on EBay and found some G.Skill sticks, but they were also using the Samsung PCB. :/

6 minutes ago, yosarianilives said:

Crazy to think that there may be really good ICs out there that nobody has tested because they were too busy binning d-die, psc, bbse, etc.

Well done on testing, and will be interesting to see what comes of this IC once you and other have more time to test!

That was part of the reason I wanted to sell some, to get others interested.

4 minutes ago, suzuki said:

Better not test this properly,you will make my collection of Samsung become irrelevant :)).

Can you make 2 runs on same os ,identical settings so we know how much they loose from density, and after “ tight “ on both at 2800 mhz ?

Sorry. :(

I might be able to do those runs, but I did have some issues with g-die not liking RTLs as tight as d-die at 2800C9 - as with most of the testing I need to double check.

Edited by Noxinite
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I've had some good progress; into the 18s with full ambient. :D

snap-10.24-17_13.thumb.png.97392f2d634d758847ba98f48b51d604.png

I had a few runs at 2948C9, but RTLs and IOLs were out of whack and timings wouldn't tighten.

snap-10.24-13_32.thumb.png.31d356310dc7b789ceaa54f1be4f1ecc.png

Edited by Noxinite
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Tried some G-die on phase quickly, but kept getting 'not exact in round' even when trying 2948C9, which I could almost do on air.

This run was looking to be around 18.5s:

snap-10.25-16_02.thumb.png.4838ce2b5968dfb07fa77b2ca16418c6.png

It seems like RCD is very important for this IC as well - compare the above screen to the below:snap-10.25-15_44.thumb.png.d1fd408fa839bff6ec638bf688667fa3.pngTried some C8, but again was getting 'not exact in round' a lot - it was also looking similar to 2949C9 all tight for efficiency:

snap-10.25-15_19.thumb.png.ff089b56cad8881c209f605422bdad1a.png

I also tried to get my OCF working again, but the USB headers as well as the back IO seem to be broken - and it doesn't like the USB 2.0 PCIE card I was using with Z170. It also instantly failed 2948C9 when I loaded it up.

Edit: also seems like the issues I was having with cold PSC (code 15) at >2800MHz is the Impact struggling with IOLs/RTLs. Sometimes I need to manually set it and sometimes it needs the 1st channel IOL to be raised to 5.

Edited by Noxinite

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Ah, hah! Found my initial single channel testing on phase.

1521694941_S-2Phase2948C82_400V.thumb.png.e52250685f95128228c949ae574b8bdd.png

Not sure why I haven't managed to get similar clocks more recently on better sticks... Maybe my boot voltage binning method is awful? Haha.

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Not yet. I recently reflashed the bios of the Impact and it seemed to help with training ram, so maybe it was just a board issue.

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Gotcha. Good luck! Very interested in seeing if this is possible.

In terms of overall efficiency, is it better or worse than similarly clocked 2x4gb memory, given the different strengths and weaknesses with the timings?

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I found some G.Skill G-die on Brainpower PCB (I think) and quick POST voltage testing seems to show they are better than all 14 of the 2GB OEM sticks I binned. XD

IMG_20181110_131117.thumb.jpg.344d87dd636a01b41e1ca0591bb3ebac.jpg

They needed 1.88V and 1.91V to POST 2800C9 tight.

No 32M passes yet though, idk wtf is going on.

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