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AMD R9 285 / 380 / 380X Tonga/Tonga XT Owners Discussion Thread - Page 39

post #381 of 548
Finally got the 285 and 380 to sync and run at 1020. The odd part is the 380 is slower than the 285. 1020 max for 380 and 1050 max for the 285.

http://www.3dmark.com/3dm/12548855

The 380 is running on water as GPU 0 and the 285 is running on air with a 7870 cooler as GPU 1. Would reversing them make a difference ?
post #382 of 548
Decided that before I do more abuse of my 380X, I really need a new PSU.

I will probably buy a Corsair RM1000x tomorrow (people are now wondering, ***, why so many watts? well, it is because that is what for sale... I picked the first decent PSU on the list after ordering it by "cheapest first").

Did some more tests today anyway, after the 480 debacle, lots of people suggested undevolting the 480...

Well, I undervolted my 380X.

Impressive results, the throttling I complained previously, is even less now (but I didn't tested it that much).

More interestingly, -40mv and +20% power results in OCCT framerate jumping from 550 all the way to 605!

Also, in my research I found out the 380X has the same TDP and power limits (at least for reference, dunno about Sapphire Nitro) as the 380.

But the 285, and the 380, have less parts available for simultanous usage, and this DOES affect power usage (I remember once someone made a "mining bios" that worked by disabling ROPs for example? to make the cards more efficient regarding power usage).

The 380X has 15% "more chip" than the 380, thus theoretically would need 15% more power.

Also, both have stock clock of 970mhz.

Sapphire Nitro 380X has stock clock of 1040mhz, thus a 7% increase.

So, assuming (I know, bad assumption, but good for "back of the napkin calculation") the power usage is linear with both clock, and chip parts powered, the Sapphire Nitro 380X should need a TDP increased by 15% for the "X" chip, and 7% for the clock. This results in 23% (1.15*1.07)

This would explain why I needed +20% to make it stop throttling.

After I get the PSU, I will see if I can disable "Crimson Power Saving" (seemly Crimson has different handling of power throttling than Catalyst, for example Tom's Hardware review of the 380X, that I believe was still using Catalyst, saw it drawing 190W in Metro 4k Loop, but 255W in Furmark, while the expected behaviour in Crimson would be draw 190W in both situations).

And also I will see what happens if I use power limit of +50% after doing registry bios modding (ie: editing the powerplay table, but on the windows registry, instead of actually flashing a modded bios).

My objective is see if I can nail down that clock, make it NEVER throttle due to power, maybe even OCed.

Happily the 380X is seemly quite safe regarding that (during Tom's Hardware Furmark abuse, its PEAK PCI-e slot draw was 71W! and the average way below it!)

The 380X is seemly a great GPU, gimped by its bios and drivers, when "set free" maybe it can surpass a nVidia 970 in performance. (I would be VERY happy if that happened).
post #383 of 548
Quote:
Originally Posted by OrSpeeder View Post

Decided that before I do more abuse of my 380X...

Interesting stuff, please share with us your results after you get the new PSU thumb.gif
post #384 of 548
Is it possible to raise the voltage on the memory? If not, can I copy memory timings from a lower strap to a higher one?
post #385 of 548
Ordered Corsair RM1000x, waiting for it to arrive smile.gif

Wish me luck!

And someone knows where on Windows Registry is the powerplay table? (so I don't have to flash a bios to tweak power limit)
post #386 of 548
So, I had some major artifacting with my 280X, and XFX RMA'd it..

Settlen Entfrm RMA: TOTAL:1Pcs
RMA Model SN
XNAR60354 R9-280X-TDBD OYY061573
Replacement Shipment: TOTAL:1Pcs
Model SN
R9-380X-4255 R5Y036822



Is this a good thing? I haven't seen many comparisons on the web.
post #387 of 548
They send you a 380x as a replacement ? Thats good!

GCN 1.2 / very good card thumb.gif
post #388 of 548
So, if I develop a problem in the next 24 months, maybe they toss a 480X my way... That would be cool.

Is there updated ways to make the card outperform its manufactured clocks?
Edited by yraith - 7/12/16 at 11:11am
post #389 of 548
I have myself an R9 380X Sapphire Nitro and decided to have a play with some overclocking. Still very new to overclocking so have settled with 1130 and 1520 for now. Once I understand a little further I will see how far it can really go. I was using MSI Afterburner and voltage was +20. Is this looking ok? It had a bit of artifacting until I pushed the voltage up at that level.
post #390 of 548
Quote:
Originally Posted by FireOath View Post

I have myself an R9 380X Sapphire Nitro and decided to have a play with some overclocking. Still very new to overclocking so have settled with 1130 and 1520 for now. Once I understand a little further I will see how far it can really go. I was using MSI Afterburner and voltage was +20. Is this looking ok? It had a bit of artifacting until I pushed the voltage up at that level.

Seems fine but try for higher, keep an eye on temps though. Chances are you won't damage it or anything. I've never killed a card from overclocking and that includes suicide runs with high clocks (for air) and demanding benchmarks. I think most 380X can probably do at least 1150, and maybe 1200 if you're lucky.
Quote:
Originally Posted by yraith View Post

So, I had some major artifacting with my 280X, and XFX RMA'd it..

Settlen Entfrm RMA: TOTAL:1Pcs
RMA Model SN
XNAR60354 R9-280X-TDBD OYY061573
Replacement Shipment: TOTAL:1Pcs
Model SN
R9-380X-4255 R5Y036822



Is this a good thing? I haven't seen many comparisons on the web.


My best Fire Strike score with a 7970 (which is identical to the 280X): 7940

Best Fire Strike score with 380X: 9465

Best 3dmark11 with 7970: 11884

Best 3dmark11 with 380X: 15570

17% more in 3dmark Fire Strike and 24% more in 3dmark11.

So the 380X you're getting is going to actually be quite a bit faster than the 280X. smile.gif
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