New GPU causing monitor to boot up in power save mode?

Aug 1, 2019 8:05AM PDT

Hello all,
I just upgraded to a Sapphire Nitro+ RX580 8gb card, but the installation isn't going so smooth. I built this PC about 7 years ago, so some parts are starting to show their age, and I figured it'd be time for an update.

The problem is, when I plug the power cables (a 6 pin port and an 8 pin port that I'm using a 6+2 cable for) into the GPU, it causes my monitor to boot into power save mode when I turn the computer on. It doesn't seem to have a problem with the card being plugged into the motherboard, so long as the power cables aren't plugged in.

I'm wondering if it's a compatibility issue? My specs are here:
Processor: Intel Core i5-3570K CPU @ 3.40 GHz 3.80 GHz
8 GB of RAM (7.90 GB usable)
Motherboard: Gigabyte GA-Z77-DS3H

Would any of these be incompatible with my new graphics card? I don't have the PSU model right now, but I can find it if anyone thinks that could be the issue. I know it's at least 600W though.

Anything you can offer would be great. Thank you!

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Re: power save
Aug 1, 2019 12:03PM PDT

The monitor goes into power save mode if it doesn't receive a signal. Did you install the drivers for the new graphic card?

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Aug 1, 2019 12:39PM PDT

No, not yet. I put in the disc that came with the card, but because the card wasn't plugged in, the driver installer didn't register that there was a card and didn't install anything. Should I try booting directly to the driver disc? Or should I try to find the drivers online?

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Let's get the PSU detail.
Aug 1, 2019 12:38PM PDT
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Aug 1, 2019 12:42PM PDT
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Only 18A per rail.
Aug 1, 2019 12:46PM PDT

You could overload that PSU. Too bad it wasn't a single rail model.

1. The PSU is suspect.
2. The BIOS appears to support EUFI and the card appears to only work in EUFI motherboards.

I can't tell you which it is but the PSU is not suitable for this and many other high power GPUs.

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Which version motherboard?
Aug 1, 2019 12:58PM PDT is for rev 1.0 and THERE'S A CLUE THERE!

The BIOS has been updated for "Improve PCI Express x16 slot compatibility."
Also the prior version was updated to "Support Secure boot option" AKA UEFI which appears to be MANDATORY for this GPU.

If your motherboard is Rev 1.0 (I didn't check 1.1 but you can) then you look to be FORCED to get that BIOS up to its last issue. Yes, it writes BETA but you have no choice from what I'm reading.

Post was last edited on August 1, 2019 2:41 PM PDT

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Updating BIOS
Aug 1, 2019 1:09PM PDT

That's one of the things I've been thinking of trying, so it's good to see someone officially recommend it!

How would I go about finding out if my motherboard is Rev 1.0? Would it tell me that if I open BIOS from startup?

If it is the case that I need to update BIOS, do you know of any decent guides that could help me? I don't want to make any wrong moves.

Thank you!

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Not official.
Aug 1, 2019 1:22PM PDT

I'm just someone that has run repair shops and well, lots of other experience. The "official" answer would be from the motherboard maker.

As to the Revision I use two methods.

1. I inspect the motherboard.
2. I look at what BIOS is currently installed. Sometimes the BIOS versions match up with the motherboard version but I'd have to hear from you to double check. I think you can do this on your own but you could tell more and I'll check later. Have to leave for a few hours.

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Thank you!
Aug 1, 2019 1:53PM PDT

I just updated BIOS to the version you suggested, and everything seems to be working great! Thank you so much!

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Good going.
Aug 1, 2019 2:46PM PDT

Glad you were able to navigate that update. The clues were there and while I'm not "official" support the CNET forum often helps out when we can.

Be on the lookout for the PSU issues. The one thing I see when it's like this PSU is a seemingly random reboot/lockup when gaming.

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