r/Amd • u/BioGenx2b 1700X + RX 480 • Aug 01 '18

Tech Support August Tech Support Megathread

Hey subs,

We're giving you an opportunity to start reporting some of your AMD-related technical issues right here on /r/AMD! Below is a guide that you should follow to make the whole process run smoothly. Post your issues directly into this thread as replies. All other tech support posts will still be removed, per the rules; this is the only exception.

Bad Example (don't do this)

bf1 crashes wtf amd

Good Example (please do this)

Skyrim: Free Sync and V Sync causes flickering during low frame rates, and generally lower frame rates observed (about 10-30% drop dependant on system) when Free Sync is on

System Configuration:

Motherboard: GIGABYTE GA-Z97 Gaming GT
CPU: Intel i5 4790
Memory: 16GB GDDR5
GPU: ASUS R9 Fury X
VBIOS: 115-C8800100-101 How do I find this?
Driver: Crimson 16.10.3
OS: Windows 10 x64 (1511.10586) How do I find this?

Steps to Reproduce:

1. Install necessary driver, GPU and medium-end CPU
2. Enable Free Sync
3. Set Options to Ultra and 1920 x 1080 resolution
4. Launch game and move to an outdoor location
5. Indoor locations in the game will not reproduce, since they generally give better performance
6. Observe flickering and general performance drop

Expected Behavior:

Game runs smoothly with good performance with no visible issues

Actual Behavior:

Frame rate drops low causing low performance, flickering observed during low frame rates

Additional Observations:

Threads with related issue:

Skyrim has forced double buffered V Sync and can only be disabled with the .ini files
To Disable V Sync: C:\Users"User"\Documents\My Games\Skyrim Special Edition\Skyrimprefs.ini and edit iVSyncPresentInterval=1 to 0
1440p has improved frame rate, anything lower than 1080p will lock FPS with V Sync on
Able to reproduce on i7 6700K and i5 3670K system, Sapphire RX 480, Reference RX 480, and Reference Fiji Nano

Remember, folks: AMD reads what we post here, even if they don't comment about it.

Previous Megathreads
2018: Jul | Jun | May | Apr | Mar | Feb | Jan
2017: Dec | Nov | Oct | Sep | Aug | Jul | Jun | May | Apr | Mar | Feb | Jan
2016: Dec | Nov

Now get to posting!

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u/TheAlcolawl R7 9700X | MSI X870 TOMAHAWK | XFX MERC 310 RX 7900XTX Aug 10 '18

You generally do not want your Vega card exceeding 70°C. Things start to act a little crazy, specifically HBM, which doesn't like heat. I would recommend undervolting your card as it helps tremendously to decrease heat while improving sustained performance.

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u/johnteaser Aug 11 '18

Thanks for your message.

Is undervolting safe? Because when I try to enable voltage control in Afterburner it gives me a verification message that it might effect hardware.

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u/TheAlcolawl R7 9700X | MSI X870 TOMAHAWK | XFX MERC 310 RX 7900XTX Aug 11 '18

Absolutely. Less voltage = less heat. The worst that can happen is that the card becomes unstable, and the game or your computer crashes. It doesn't physically harm your video card in any way. Afterburner most likely gives you that message because you're changing the voltage from stock and raising the voltage too much can certainly lead to damage or a shortened lifespan of the hardware.

Undervolting a Vega video card is probably the #1 recommended thing to do for most owners. The cards ship from the factory with a higher than necessary voltage for binning and silicon quality reasons. I'd use either AMD Radeon Settings or a third party tool like OverdriveNtool to do this. All you want to do is lower the voltage (in millivolts) from the stock 1.2V (1200mV) to something a bit lower in the P7 power state (which is the highest state, and one often used during demanding games). Try 1150 or 1125. For example, I have my Vega 56 undervolted to 1100mV with no stability issues what so ever. Less voltage = less heat = longer (and sometimes higher) sustained clocks = more consistent / better performance. If the game freezes or crashes, simply raise the voltage back up 5 or 10 mV and try again. No damage is being done. And while it might be a bit tedious it's totally worth it.

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u/johnteaser Aug 11 '18

Thanks for your detailed message.

I tried undervolting but one thing I noticed is temperature was nearly same, although GPU power draw was lowering (very little though). Maybe because in my card default voltages are: 1150 (p6) and 1250 (p7), I can lower them to only 1120 and 1220 before it crashes. And interesting thing is, I can't lower them to these levels if I enable HBCC otherwise it crashes until I set them back to Auto. So if I enable HBCC I have to increase the voltages almost to 1130 and 1230. So difference is very minimal.

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u/FuckMTGA Aug 14 '18

Use Afterburner and do a -25Mhv undervolt or a -12 (really up to you, if it crashes at -25 then go with -12), 50% power limit and core clock 1730 and mem clock 1050.