1.5v safe Samsung Bdie?

opethdisciple · 4 May 2020 at 21:23

So I decided to just give it a go. Not run my ram this high in voltage before as been scared.

But I took the dram calc fast timings put them in and upped the voltage to 1.5v from the 1.45v it recommends. (It doesn't work at 1.45v)

I know it's been said before that 1.5v is safe on bdie but I'm just checking again. I don't want to break my mobo or something if the ram was to break at the same time.

I'm running memtest at the moment and it's been running for 17 mins with no issues so I'm getting excited that this might actually work!

EsaT · 4 May 2020 at 21:37

High voltage is going to increase memory heating and B-die is very temperature sensitive.
That's one of he reasons why memtest can go through but then games cause crashes.
You should have GPU running Furmark to have realistic memory stabilitity testing environment.

Shac · 5 May 2020 at 01:07

I have run B die both 8 Pack and the Viper steel at 1.5v for a long time. no issues no running games IBT, CB20 F@H etc.
I believe issues arise with overheating when people go above 1.5 trying for the max score on a benchtest.
@opethdisciple what have you set the memory too and what IBT scores do you get?

Skynet5 · 5 May 2020 at 18:53

Yeah what timings and clocks have you moved to to test with voltage?

1.5 is fine for bdie although I just run @ 1.4 with XMP and tighter 2nd and 3rd

opethdisciple · 5 May 2020 at 23:25

Well I tried some CL14 timings which are not as aggressive as the dram calc and everything seems to be fine at 1.45v.

The dram calc suggests timings like: 3600MHz 14-15-14-14-28 at 1.45v which don't work. I haven't tried it at 1.5v however.

I'm a little bit scared to be honest to run it that high and am happy at what I have managed to achieve with them at the moment.

Strangely this Gigabyte motherboard seems to add more voltage than what you specify in the bios. I put in 1.45v and can see it is running the ram at 1.47v.

Any way I've tested it with hci memtest for 400% and have gamed on it for the last two evenings so so far so good.

wookiee87 · 8 May 2020 at 13:10

I've just ordered two kits of Team Group 8Pack RIPPED Edition 16GB (2x8GB) DDR4 PC4-28800C14 3600MHz Dual Channel ram, would like to see if there is a performance difference from my cl18 kit, i suspect there will but, a question if i have to run close to 1.5v to get it stable will airflow be needed or will the ram work, just run warm?

opethdisciple · 8 May 2020 at 14:47

wookiee87 said:
I've just ordered two kits of Team Group 8Pack RIPPED Edition 16GB (2x8GB) DDR4 PC4-28800C14 3600MHz Dual Channel ram, would like to see if there is a performance difference from my cl18 kit, i suspect there will but, a question if i have to run close to 1.5v to get it stable will airflow be needed or will the ram work, just run warm?

The XMP profile should be all you need to apply.

wookiee87 · 8 May 2020 at 14:50

opethdisciple said:
The XMP profile should be all you need to apply.

just checking, many thanks

Skynet5 · 8 May 2020 at 15:47

wookiee87 said:
I've just ordered two kits of Team Group 8Pack RIPPED Edition 16GB (2x8GB) DDR4 PC4-28800C14 3600MHz Dual Channel ram, would like to see if there is a performance difference from my cl18 kit, i suspect there will but, a question if i have to run close to 1.5v to get it stable will airflow be needed or will the ram work, just run warm?

I think you'll have to run 1.4-1.5v to get the xmp tbh. Looking forward to seeing the results from you guys. I'm sure they'll be better for many, and only those with crappy IMC will see negligible gains

wookiee87 · 8 May 2020 at 16:01

lnoton said:
I think you'll have to run 1.4-1.5v to get the xmp tbh. Looking forward to seeing the results from you guys. I'm sure they'll be better for many, and only those with crappy IMC will see negligible gains

I've had fairly good luck with my chip all 3600mhz kits I've had between cl16 - cl18 have worked out of the box and IF set to 1800mhz too, guess time will tell, hopefully it all just works, would you say start at 1.4v and inch up if not stable?, i hope to stay away from 1.5v if at all possible, if not i will look at some active cooling just to be safe. (4 sticks in close proximity at 1.5v can't be good long term?)

Skynet5 · 8 May 2020 at 16:06

wookiee87 said:
I've had fairly good luck with my chip all 3600mhz kits I've had between cl16 - cl18 have worked out of the box and IF set to 1800mhz too, guess time will tell, hopefully it all just works, would you say start at 1.4v and inch up if not stable?, i hope to stay away from 1.5v if at all possible, if not i will look at some active cooling just to be safe. (4 sticks in close proximity at 1.5v can't be good long term?)

Yeah, I don't imagine these doing 1.3x at rated. Move up 0.05v at a time.

I've had great success with Karhu to test ram quicker. Worth the couple of London priced pints.

opethdisciple · 8 May 2020 at 17:38

lnoton said:
I think you'll have to run 1.4-1.5v to get the xmp tbh. Looking forward to seeing the results from you guys. I'm sure they'll be better for many, and only those with crappy IMC will see negligible gains

But that's what I mean, the XMP/DOCP profile sets the voltage and timings not just the timings as that wouldn't be stable.

opethdisciple · 8 May 2020 at 17:40

I have my ram at 1.45v in the bios, but I can see the board is applying 1.47v.

I tried to see how low they would go, but 1.43v wasn't stable, and only 1.44v was left to try so the fact that things where stable at 1.45v I just left it alone.

wookiee87 · 8 May 2020 at 17:41

opethdisciple said:
I have my ram at 1.45v in the bios, but I can see the board is applying 1.47v.

and temps are ok? around the 55-60 degree mark or lower?

opethdisciple · 8 May 2020 at 17:43

wookiee87 said:
and temps are ok? around the 55-60 degree mark or lower?

I assume so. I tried looking at temps using hwinfo but it doesn't seem to have a reading for ram. It's been game stable for a couple of gaming sessions of Doom Eternal as well as passes 400% HCI so I assume all is OK.

wookiee87 · 8 May 2020 at 17:46

opethdisciple said:
I assume so. I tried looking at temps using hwinfo but it doesn't seem to have a reading for ram. It's been game stable for a couple of gaming sessions of Doom eternal as well as passes 400% HCI so I assume all is OK.

no prob, I've got a commander pro and looking to place a thermal probe under the top part of the ram heatspreadder just to keep an eye on them, having 4 in a block could get warm

Shac · 11 May 2020 at 20:07

Samsung "B" die spec sheet.

https://www.samsung.com/semiconduct...11/8G_B_DDR4_Samsung_Spec_Rev2_1_Feb_17-0.pdf

Table of contents number 6. Absolute Maximum DC ratings.

Voltage 1.5V which means they are guaranteed to run and be safe at that.

Operating Temperature Range 0° to 95°C.

Notes 1 and 2 for the above state:
1. Operating Temperature TOPER is the case surface temperature on the center/top side of the DRAM.
2. The Normal Temperature Range specifies the temperatures where all DRAM specifications will be supported. During operation, the DRAM case temperature must be maintained between 0-85°C under all operating conditions

If you wish them to operate in the 85°C to 95°C range then the following changes must be made.
a) Refresh commands must be doubled in frequency, therefore reducing the refresh interval tREFI to 3.9us.
b) If Self-Refresh operation is required in the Extended Temperature Range, then it is mandatory to use the Manual Self-Refresh mode with Extended Temperature Range capability (MR2 A6 = 0b and MR2 A7 = 1b).

So Samsung are saying that 1.5V and below 85°C is safe and within spec.

opethdisciple · 11 May 2020 at 20:14

Shac said:
Samsung "B" die spec sheet.

https://www.samsung.com/semiconduct...11/8G_B_DDR4_Samsung_Spec_Rev2_1_Feb_17-0.pdf

Table of contents number 6. Absolute Maximum DC ratings.

Voltage 1.5V which means they are guaranteed to run and be safe at that.

Operating Temperature Range 0° to 95°C.

Notes 1 and 2 for the above state:
1. Operating Temperature TOPER is the case surface temperature on the center/top side of the DRAM.
2. The Normal Temperature Range specifies the temperatures where all DRAM specifications will be supported. During operation, the DRAM case temperature must be maintained between 0-85°C under all operating conditions

If you wish them to operate in the 85°C to 95°C range then the following changes must be made.
a) Refresh commands must be doubled in frequency, therefore reducing the refresh interval tREFI to 3.9us.
b) If Self-Refresh operation is required in the Extended Temperature Range, then it is mandatory to use the Manual Self-Refresh mode with Extended Temperature Range capability (MR2 A6 = 0b and MR2 A7 = 1b).

So Samsung are saying that 1.5V and below 85°C is safe and within spec.

Excellent news and good find.

wookiee87 · 11 May 2020 at 20:17

opethdisciple said:
Excellent news and good find.

+1

Shac · 11 May 2020 at 20:25

I just did a new membench (new version 1.71) default run with a score of 191.73
Dram at 1.47 volts.
Before test centre top of the middle sticks of the four temperature was 36°C
During test peaked at 41°C

I use the Patriot Viper 4400 modules and everyone tells me the 8 pack heatspreaders are better so feel free to compare.
Yours can only be better.

To be fair could probably do with a longer test but hey its time for some gaming!