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AMD R9 285 / 380 / 380X Tonga/Tonga XT Owners Discussion Thread - Page 35

post #341 of 548
What are your clocks at with +100mv and what voltage are you actually seeing with gpu-z? I did some tests with cooling better than water and I pushed to 1.35v for 1225 to 1250mhz. I only gained 500 3dmark firestrike graphics points compared to 1150 on the core with 1.2v and normal room temperature cooling. My 285 is flashed as a 380x so I actually don't over volt with software at all.
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post #342 of 548
Quote:
Originally Posted by Gruelius View Post

I more want to know what a safe 24/7 voltage is if temps dont go above 70, e.g. ivy bridge you can go 1.55v for max overclocking but a safe 24/7 voltage is much less than that. Belive it or not i did read your post you just said max you can set is 200mv. But I am too lazy to read the thread to find out what people have tried I will admit haha.

If it can take more Im willing to edit bios tables to get more than +200mv to play with, is there much information around what is the max voltage you would want to run if adequately cooled?

Thanks!

There is no official "max voltage". Actually yea there is, it's stock voltage lol tongue.gif

You are not going to get anything out of more than 200mv, maybe even +100mv (speaking about 24/7 oc).
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post #343 of 548
Quote:
Originally Posted by Bartouille View Post

There is no official "max voltage". Actually yea there is, it's stock voltage lol tongue.gif

You are not going to get anything out of more than 200mv, maybe even +100mv (speaking about 24/7 oc).

Thanks for the pointers. I am starting to get odd throttling happening at 1150 mhz core w +100mv or 1175 mhz core with +75mv. GPU temp is 70 deg C, In GPU-Z I am seeing VDDC Power [W] jump above 150w and VDDC Current [A] will be from 120-140 then the core speed will drop to 600mhz or so.

Is there a hard limit I am hitting for power draw or is this a cooling issue? I cannot see VRM temps, the VRMs have a heatsink and I have a fan blowing over it.

Thanks!
Quote:
Originally Posted by ducegt View Post

What are your clocks at with +100mv and what voltage are you actually seeing with gpu-z? I did some tests with cooling better than water and I pushed to 1.35v for 1225 to 1250mhz. I only gained 500 3dmark firestrike graphics points compared to 1150 on the core with 1.2v and normal room temperature cooling. My 285 is flashed as a 380x so I actually don't over volt with software at all.

sorry missed this.

with +100mv I have not determined what the wall is as I get the stuttering mentioned before. Seeing 1.2-1.225 volts.

my stable oc of 1150 with +50mv moves from 1.175 to 1.21
Edited by Gruelius - 5/21/16 at 7:05pm
post #344 of 548
I keep my 380 at 1150 MHz core clock and 1550 MHz memory. I haven't adjusted the voltage, but I did up the power limit.
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post #345 of 548
http://www.aquatuning.us/water-cooling/gpu-water-blocks/gpu-chip-cooler/17107/alphacool-nexxxos-gpx-solo-xbox-kompatibel-schwarz?c=6471

I wish I had seen this before I killed my crossfired GPU. Nice thing about them is the plate can be changed for a different models of 380s or any other card. Crossfired 38X should should equal a 390 for most things at standard speed and give 10-15% performance more like my 285 does OC'd and with lower temperatures. Get a fire strike every day use graphics score of 8940 OC'd. When crossfired at standard speed 16000. ( heat problems with Cross fire) Getting a 380 next week that should be even better. Yes a 1050 watt power supply is needed with my watt hog CPU. 2Gb is good enough for 2560 x 1440 for more than that need more Gb.

Maybe if the lottery fairy shares some good luck with me maybe I will do a 6 panel Eyefinity setup. Until then one 27" will have to do.
Edited by warpuck - 5/22/16 at 3:06pm
post #346 of 548
Actually, in my testing the 380X is significantly more powerful than everyone thinks it is. It's already quite close to the 290/390 in terms of performance. The 380X is quite a bit more powerful than the 7970/280X (Tahiti) and even more powerful than the R9 285. Two 380X should blow a single 390 out of the water in terms of performance, and be very close to the Fury X in performance since they have the same specs (4096 SP, 256 TMU and 64 ROPs).

I know Polaris is coming soon but I got a decent price on another 380X Nitro, so I'll have Crossfire again, and it only took a small amount of my savings. So I'll have two 380X Nitro shortly. They should be fine until Vega comes out for the games I play. I had two R9 290 Vapor-X but sold them...

I already have 3 way Eyefinity (5760x1080). A single 380X isn't enough for good frame rates in some of the games I have. Some of them are even from 2014. I haven't tried anything from this year yet.

Depending on how it does in the games I play, and new games that come out, I might not even get Vega. My PC gaming is pretty light lately and though I have the money, I'm not sure if I can justify it. So dual 380X might have to work for me for some time.
post #347 of 548



















Edited by neurotix - 5/27/16 at 12:21am
post #348 of 548
There is a simple way to know why my 380X is throttlign?

Also, there is somehwere a list of known power values? (ie: what voltages, power limits, TDP, whatnot the GPU expects, or what triggers throttling).
post #349 of 548
I have a motherboard that says it supports PCIe 2-16x, or 16x, 8x, 8x slots. It's a workstation so it wasn't made for gaming. I know of people who successfully Crossfired 2- HD7850s on it. Do you think it would be possible to 3 way crossfire R9-285s? BTW PCIe 2.0.
Edited by Retrorockit - 6/3/16 at 8:53am
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post #350 of 548
Quote:
Originally Posted by OrSpeeder View Post

There is a simple way to know why my 380X is throttlign?

Also, there is somehwere a list of known power values? (ie: what voltages, power limits, TDP, whatnot the GPU expects, or what triggers throttling).

Gpu can thottle because either:
- Temps are too high and the gpu downclocks. Check it.
- You got a bad binned chip that requires more voltage than normal, but the power limit is the same. Increasing % power limit should eliminate the throttling.
- There has been issues with some drivers. try different drivers, beta and WHQL.
Quote:
Originally Posted by Retrorockit View Post

I have a motherboard that says it supports PCIe 2-16x, or 16x, 8x, 8x slots. It's a workstation so it wasn't made for gaming. I know of people who successfully Crossfired 2- HD7850s on it. Do you think it would be possible to 3 way crossfire R9-285s? BTW PCIe 2.0.

Tonga is limited only to 2-way crossfire.
Edited by Ansau - 6/4/16 at 5:16am
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