Custom RAM Timings for GPU's with GDDR5 - DOWNLOAD LINKS - UPDATED - page 35.

vapourminer

legendary

Activity: 4354

Merit: 3614

what is this "brake pedal" you speak of?

Quote from: Truthchanter on April 03, 2017, 10:32:14 AM

I may have read someone say that powercolor 470 4gb red dragon has always had samsung. I have 2 of them (single fan) and they both have samsung

i also have a powercolor red dragon 4gb single fan with samsung memory. goes good on eth with the 1750 strap mod but it has a crappy hsf so runs warm.

dallase

member

Activity: 129

Merit: 10

Quote from: phobosq on April 03, 2017, 09:32:44 AM

It's a lottery, I have Gigabyte 470 4 GB with Hynix, and my friend bought his 4 cards in the same shop a week after me, and got 1 with Samsung, 2 with Hynix and 1 Elpida. My 480 Nitro OC 4 GB version has Samsungs, but Nitro+ (with a plus) has Elpida.

FWIW, I've noticed all my MSI's with samsung memory have mandarin (or hanja, i dont know) on PLU/SKU label, and a asian support sticker on outside of box, along with a sticker on back of GPU with mandarin/hanja on it. My Hynix have none of this.

Wolf0

member

Activity: 81

Merit: 1002

It was only the wind.

Quote from: nerdralph on March 26, 2017, 04:45:26 PM

Quote from: Eliovp on March 26, 2017, 03:39:24 PM

Quote from: nerdralph on March 26, 2017, 02:52:15 PM

Quote from: lexele on March 26, 2017, 01:25:49 PM

Quote from: nerdralph on March 26, 2017, 12:42:55 PM

It's based on the 1625 strap, since the 1500 strap wasn't stable for me beyond 1875.

That's very strange, I have several rx with hynix and the 1500 strap is the most stable at least up to 2050.

Maybe your cards have better cooling for the RAM? This is an Asus Strix. After tuning the 1625 strap, it was stable at ~27.2Mh with a 1950 mem clock. Now I'm testing 2000.

If it's a Strix you might have memory voltage control, have you tried/checked this?

I believe their custom VRM chip does control the memory voltage, but I haven't looked into it much. Since the RAM is not cooled (no thermal connection to the heatsink), I thought bumping the memory voltage would make things worse. The tuned 1625 strap is working quite well so far. It tested OK at 2000, and now I'm trying 2050.

Once I've found the limit, I may look into the memory voltage to control power use, and see if it is stable with lower memory voltages.

I have a Strix, pretty sure it doesn't work.

EDIT: Wait... wait... there's something here....

Walrusbonzo

hero member

Activity: 682

Merit: 500

Quote from: batko on April 03, 2017, 02:52:09 AM

Quote from: Walrusbonzo on April 02, 2017, 02:13:10 PM

Thanks everyone for the shared info, tools and shared straps. I've settled on using one of nerdralph's and I've gained nearly 1mh/s per card, 28.6~ to 29.6~ using 1125/2050 clocks.

gpu? which memory

4 different variants of RX480, but all are 8GB cards with Samsung RAM and perform identically with the same clock speeds.

Ambros

hero member

Activity: 653

Merit: 500

Quote from: bardacuda on April 03, 2017, 09:17:18 AM

So every single model of 470 4GB is guaranteed to have Samsung memory?

If you bought cards with the same exact code you can know the memory they have
Nitro+ or without + or nor is not sufficient to distinguish memories

bardacuda

sr. member

Activity: 430

Merit: 254

Ok thanks for your inputs!

Truthchanter

sr. member

Activity: 689

Merit: 253

Quote from: bardacuda on April 03, 2017, 09:17:18 AM

So every single model of 470 4GB is guaranteed to have Samsung memory?

I may have read someone say that powercolor 470 4gb red dragon has always had samsung. I have 2 of them (single fan) and they both have samsung

phobosq

member

Activity: 66

Merit: 10

It's a lottery, I have Gigabyte 470 4 GB with Hynix, and my friend bought his 4 cards in the same shop a week after me, and got 1 with Samsung, 2 with Hynix and 1 Elpida. My 480 Nitro OC 4 GB version has Samsungs, but Nitro+ (with a plus) has Elpida.

bardacuda

sr. member

Activity: 430

Merit: 254

So every single model of 470 4GB is guaranteed to have Samsung memory?

laik2

sr. member

Activity: 652

Merit: 266

Quote from: bardacuda on April 03, 2017, 08:30:28 AM

Just flash back to stock BIOS before you send it.

Can anyone tell me if there are any specific models of 470 4GB cards that are guaranteed to have Samsung mem? Thought I read somewhere that all MSI Armors that have an 8-pin PEG connector do and any recent Sapphire Nitro OCs. Not sure if that info is accurate though or if there are any other models. I'm hoping to maybe offload my Hawaii cards and get some 470s. Gonna have a 2nd rig soon with an 850W PSU and I'd love to be able to run 3 or 4 cards in it (I can't even run 3 Hawaiis without being at or above max output).

4Gs are all good, keep an eye on 8Gs...some of them come with micron memory...

bardacuda

sr. member

Activity: 430

Merit: 254

Just flash back to stock BIOS before you send it.

Can anyone tell me if there are any specific models of 470 4GB cards that are guaranteed to have Samsung mem? Thought I read somewhere that all MSI Armors that have an 8-pin PEG connector do and any recent Sapphire Nitro OCs. Not sure if that info is accurate though or if there are any other models. I'm hoping to maybe offload my Hawaii cards and get some 470s. Gonna have a 2nd rig soon with an 850W PSU and I'd love to be able to run 3 or 4 cards in it (I can't even run 3 Hawaiis without being at or above max output).

doktor83

hero member

Activity: 2548

Merit: 626

i doubt they check mem timings Cheesy

bensam1231

legendary

Activity: 1764

Merit: 1024

Curiously has anyone had issues with sending their cards in for RMA after modifying the straps? Do manufacturers have issues with this?

Wolf0

member

Activity: 81

Merit: 1002

It was only the wind.

Quote from: Truthchanter on March 26, 2017, 01:37:52 PM

Quote from: Eliovp on March 23, 2017, 10:30:44 AM

Quote from: Truthchanter on March 23, 2017, 10:24:34 AM

Quote from: laik2 on March 22, 2017, 05:29:27 PM

Quote from: nerdralph on March 22, 2017, 05:21:51 PM

Quote from: Truthchanter on March 22, 2017, 04:40:17 PM

Are there any publicly available custom memory strap timings for the rx 400 series? (samsung, elpida, or hynix)

Here's the Samsung strap I'm currently working on:
777000000000000022CC1C0010625C49D0571016B50BD50900400700140514207A8900A00300000 0191131399D2C3617

It's the 1750 strap with RRD=5, FAW&32AW=0. It's stable at 2100 on my Sapphire Rx470. The previous custom strap I tried was based on the 1625 strap, and I would start getting a lot of errors over 2000. I just started working on it today, so there's more tweaking to do (like trying a lower tRC for RAS).

Nicely done

Lets see the final results.

Small adjustments to your timing based on my experience : 777000000000000022CC1C00CE615C45C0571016B30CD50900400700140514207A8900A00300000 0151031399D2C3617

Thanks! Nice improvement over the regular 1750 strap. Now the question is... will this 1750 samsung strap work with 480s with samsung (and then both 4gb and 8gb?)

If you have one of the first 4G samsung batches, it will work and even improve even more. (because you can unlock those to 8G)
If you have a newer batch of those 4G samsung's, it will most probably run but won't run stable.

Greetings

Why won't it be stable? Would this only be stable for reference cards?

Different chips, but both Samsung.

batko

full member

Activity: 169

Merit: 100

Quote from: Walrusbonzo on April 02, 2017, 02:13:10 PM

Thanks everyone for the shared info, tools and shared straps. I've settled on using one of nerdralph's and I've gained nearly 1mh/s per card, 28.6~ to 29.6~ using 1125/2050 clocks.

gpu? which memory

Walrusbonzo

hero member

Activity: 682

Merit: 500

Thanks everyone for the shared info, tools and shared straps. I've settled on using one of nerdralph's and I've gained nearly 1mh/s per card, 28.6~ to 29.6~ using 1125/2050 clocks.

Wolf0

member

Activity: 81

Merit: 1002

It was only the wind.

Quote from: lexele on March 26, 2017, 01:25:49 PM

Quote from: nerdralph on March 26, 2017, 12:42:55 PM

It's based on the 1625 strap, since the 1500 strap wasn't stable for me beyond 1875.

That's very strange, I have several rx with hynix and the 1500 strap is the most stable at least up to 2050.

He's on Samsung - that's why - Hynix/Elpida, usually 1500 is fine.

bensam1231

legendary

Activity: 1764

Merit: 1024

Quote from: Truthchanter on April 02, 2017, 10:05:29 AM

Quote from: bensam1231 on April 02, 2017, 03:45:22 AM

Curiously, how well do custom timings play with other algos? Is this just a Ethereum only thing (or dual mining)?

What happens if you try to run cards with custom timings on something like Equihash?

Using my eth timings for zec worked fine. However there may be more optimum timings for zec or xmr compared to the eth ones frequently discussed.

Yeah, just discussing from a stability and performance standpoint (such as you end up with worse performance then normal with the new straps) while mining altcoins. I'm not a big fan of getting shoehorned into a corner.

I assume if it's a stability issue you just back off the memory clock speed to the point that the timings are actually meant for or is it even a issue?

Truthchanter

sr. member

Activity: 689

Merit: 253

Quote from: bensam1231 on April 02, 2017, 03:45:22 AM

Curiously, how well do custom timings play with other algos? Is this just a Ethereum only thing (or dual mining)?

What happens if you try to run cards with custom timings on something like Equihash?

Using my eth timings for zec worked fine. However there may be more optimum timings for zec or xmr compared to the eth ones frequently discussed.

Wolf0

member

Activity: 81

Merit: 1002

It was only the wind.

Quote from: nerdralph on March 26, 2017, 12:49:40 PM

Quote from: Eliovp on March 26, 2017, 12:17:19 PM

There is some serious difference in Samsung Modlues, if you're lucky you can have one like i have.

one that easily breaks 34Mh on ETH.. i'm still surprised myself to be honest..

GPU0 - 1220 / 2150
GPU1 - 1180 / 2100
GPU2 - 1220 / 2100
GPU3 - 1220 / 2100
GPU4 - 1220 / 2100
GPU5 - 1220 / 2100

yeah.. strange indeed Roll Eyes

It's impossible to do >34Mh with a 2150 mem clock. With 2250, maybe, but certainly not at 2150.

I thought that was jacked up - possibly misreporting.

Topic: Custom RAM Timings for GPU's with GDDR5 - DOWNLOAD LINKS - UPDATED - page 35. (Read 155645 times)