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Gigabyte Vega 64 Gaming OC 8G - Crossfire Unstable

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post #1 of 16 (permalink) Old 04-25-2019, 01:52 AM - Thread Starter
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Gigabyte Vega 64 Gaming OC 8G - Crossfire Unstable

Hi.

I have 2X Vega64 crossfire setup in a mid-tower case with 1800X CPU, all running at stock speeds. The cards are Gigabyte Vega64 8GB OC two-fan models. At 4k ultra settings on full load, the system becomes unstable and BSODs or freezes and needs to be hard-reset. Earlier I used 2X R9 290 Sapphire Tri-X OC cards in the same case and with the same CPU, but they were very stable even at full load. Ofc, the R9 290s in crossfire were only pushing 2560x1440 at high settings, but even so.

Anyway, the Vega64 cards in crossfire were heating up to 85*C on full load at 4K 60fps constant on ultra settings and the case temps were at 47-50*C. Assuming the inside of the case was overheating and causing the cards to freeze, I ramped up the fan speeds on all the case fans and also on the graphics cards until the fan noise is just below un-bearable. This reduced case temps to about 40-42*C and graphics card temps to about 60-65*C. However, even now on 4k ultra settings at full load the system still freezes and needs a hard reset after some time of gaming.

So with the case and cards not as hot as before, what could be causing the freezing? I am not OC'ing anything yet, the CPU and graphics cards are at stock speeds, the RAM is at 3200MHz with stable timings and tested to some extent. Everything points to the graphics cards freezing / locking up. So what can I do to make the situation better?

As a point of reference, I tested each card separately and they work fine and don't freeze up. Only when I run them at 4k ultra in crossfire, they freeze up and need to be hard reset. Any advice / help appreciated. Thank you for reading.

AMD Ryzen 7 1800X @3.6 GHz / Cooler Master 212 Turbo / ASUS Crosshair VI Hero / 2X 16GB G-Skill F4-4000C19-16GTZ @3200 MHz / 2X Gigabyte Vega 64 OC 8GB CFX / Samsung 840Pro 256GB SSD / WD Black 3TB Sata HDD / Antec 1300W PSU / Etc.

Last edited by hvora70; 05-19-2019 at 01:07 AM.
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post #2 of 16 (permalink) Old 04-25-2019, 03:12 AM
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Quote: Originally Posted by hvora70 View Post
Hi.

I have 2X Vega64 crossfire setup in a mid-tower case with 1800X CPU, all running at stock speeds. The cards are Gigabyte Vega64 8GB OC two-fan models. At 4k ultra settings on full load, the system becomes unstable and BSODs or freezes and needs to be hard-reset. Earlier I used 2X R9 290 Sapphire Tri-X OC cards in the same case and with the same CPU, but they were very stable even at full load. Ofc, the R9 290s in crossfire were only pushing 2560x1440 at high settings, but even so.

Anyway, the Vega64 cards in crossfire were heating up to 85*C on full load at 4K 60fps constant on ultra settings and the case temps were at 47-50*C. Assuming the inside of the case was overheating and causing the cards to freeze, I ramped up the fan speeds on all the case fans and also on the graphics cards until the fan noise is just below un-bearable. This reduced case temps to about 40-42*C and graphics card temps to about 60-65*C. However, even now on 4k ultra settings at full load the system still freezes and needs a hard reset after some time of gaming.

So with the case and cards not as hot as before, what could be causing the freezing? I am not OC'ing anything yet, the CPU and graphics cards are at stock speeds, the RAM is at 3200MHz with stable timings and tested to some extent. Everything points to the graphics cards freezing / locking up. So what can I do to make the situation better?

As a point of reference, I tested each card separately and they work fine and don't freeze up. Only when I run them at 4k ultra in crossfire, they freeze up and need to be hard reset. Any advice / help appreciated. Thank you for reading.
Are you undervolting them? Have you disabled ULPS in the registry
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post #3 of 16 (permalink) Old 04-25-2019, 05:44 AM - Thread Starter
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Quote: Originally Posted by ht_addict View Post
Are you undervolting them? Have you disabled ULPS in the registry

Not undervolting. Don't know how

Have not disabled ULPS yet. But the system freeze takes place during running the cards at full load, and not a low load. So the card is not in Low Power mode at that time .... ? Will still do it and check if it works.

Also not sure why it only happens during crossfire. Doesn't freeze at full load on a single card. My power supply is 1300W, and more than enough to support both cards so it's for sure not a power shortage issue at least as far as I understand it.

AMD Ryzen 7 1800X @3.6 GHz / Cooler Master 212 Turbo / ASUS Crosshair VI Hero / 2X 16GB G-Skill F4-4000C19-16GTZ @3200 MHz / 2X Gigabyte Vega 64 OC 8GB CFX / Samsung 840Pro 256GB SSD / WD Black 3TB Sata HDD / Antec 1300W PSU / Etc.
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post #4 of 16 (permalink) Old 04-27-2019, 06:34 PM
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Quote: Originally Posted by hvora70 View Post
Not undervolting. Don't know how

Have not disabled ULPS yet. But the system freeze takes place during running the cards at full load, and not a low load. So the card is not in Low Power mode at that time .... ? Will still do it and check if it works.

Also not sure why it only happens during crossfire. Doesn't freeze at full load on a single card. My power supply is 1300W, and more than enough to support both cards so it's for sure not a power shortage issue at least as far as I understand it.
ULPS can cause stability issues in crossfire so disable. Learn to undervolt. Less power draw means less heat.
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post #5 of 16 (permalink) Old 04-27-2019, 06:40 PM
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Been disabling ULPS since the HD 5970 days. First thing I do when I update AMD drivers or MSI Afterburner. With ULPS on Crossfire is broken.

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post #6 of 16 (permalink) Old 04-28-2019, 02:43 PM - Thread Starter
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Disabled ULPS through MSI Afterburner and manually through REGEDIT. Also under-volted the cards. Working stable for now but my performance is much less compared to what I would like.


My card memory is at 800 MHz and card GPU is around 1450 MHz or so max. I haven't run very graphic intensive tests or games yet. But will update.

AMD Ryzen 7 1800X @3.6 GHz / Cooler Master 212 Turbo / ASUS Crosshair VI Hero / 2X 16GB G-Skill F4-4000C19-16GTZ @3200 MHz / 2X Gigabyte Vega 64 OC 8GB CFX / Samsung 840Pro 256GB SSD / WD Black 3TB Sata HDD / Antec 1300W PSU / Etc.
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post #7 of 16 (permalink) Old 04-28-2019, 05:09 PM
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Quote: Originally Posted by hvora70 View Post
Disabled ULPS through MSI Afterburner and manually through REGEDIT. Also under-volted the cards. Working stable for now but my performance is much less compared to what I would like.


My card memory is at 800 MHz and card GPU is around 1450 MHz or so max. I haven't run very graphic intensive tests or games yet. But will update.
Checkout the thread below. You need to use the program OverdriveN Tool 0.2.8 Beta 11. With it, I set my GPU to 1700mhz @ 1095mv , HBM to 1110 @ 950mv. Playing games it will run 1600mhz and up on GPU and 1110mhz HBM

https://forums.guru3d.com/threads/rx...s-cont.426001/

You also want to find and use powertable registry tweak to set at 150% so you can play around with that setting jn Overdrive N tool
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post #8 of 16 (permalink) Old 04-28-2019, 06:00 PM
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47°C to 50°C+ case temps. Is this a common issue w/air-cooled crossfire and SLI setups?
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post #9 of 16 (permalink) Old 04-28-2019, 06:04 PM
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Typically, like my setup, one card will run slightly warmer then the other.

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-Guide to 2nd Case Modding for Better GPU(s) Performance/Cooling-
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post #10 of 16 (permalink) Old 04-28-2019, 07:20 PM
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Quote: Originally Posted by hvora70 View Post
Disabled ULPS through MSI Afterburner and manually through REGEDIT. Also under-volted the cards. Working stable for now but my performance is much less compared to what I would like.


My card memory is at 800 MHz and card GPU is around 1450 MHz or so max. I haven't run very graphic intensive tests or games yet. But will update.
Why is your memory clocked so low? Stock is 945.
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