Problem with 280X Crossfire on 2 mobos

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   I was going to say that based on the manufacturers of your GPUs they should work together until I saw the Sapphire card is a Vaptor X model. Powercolor and Sapphire both typically use reference design boards in their products however, the Vaptor X series use non reference board designs and a tweaked bios. While technically they should still work together with the system defaulting the clocks to the lowest of the two I suspect that the Vaptor X may not be playing nice with the powercolor card.
Given that you have tried 2 separate motherboards with the cards that is where my suspicions lie. Should this be the case you will need to trade in or sell then buy one of the cards to get two matching cards. I would try and get another Vaptor X as they have better cooling and board designs. 

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Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25073	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Topic: Problem with 280X Crossfire on 2 mobos Posted: 08 Jun 2015 at 1:46pm
	I was going to say that based on the manufacturers of your GPUs they should work together until I saw the Sapphire card is a Vaptor X model. Powercolor and Sapphire both typically use reference design boards in their products however, the Vaptor X series use non reference board designs and a tweaked bios. While technically they should still work together with the system defaulting the clocks to the lowest of the two I suspect that the Vaptor X may not be playing nice with the powercolor card. Given that you have tried 2 separate motherboards with the cards that is where my suspicions lie. Should this be the case you will need to trade in or sell then buy one of the cards to get two matching cards. I would try and get another Vaptor X as they have better cooling and board designs.

parsec Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 04 May 2015 Location: USA Status: Offline Points: 4996	Post Options Post Reply Quote parsec Report Post Thanks(0) Quote Reply Posted: 08 Jun 2015 at 12:27pm
	Intel CPUs like yours provide 16 PCIe 3.0 lanes, which are used with the video card slots. As is normal for any board with a CPU like yours, when two of the PCIe x16 slots are used, they run in x8/x8 mode. That should be fine for Crossfire, since it only requires at least an x4 connection for the second card. Two AMD cards can be used in Crossfire in x8/x8 mode. The Z75 Pro board had the second x16 slot connected to four of the PCIe 2.0 lanes in the Z75 chipset, and that board supports Crossfire too. The AMD/ATI Crossfire driver requires that the Microsoft software package, Microsoft .NET Framework is installed in the PC before the Crossfire driver is installed. Your Z77 Extreme4 board's manual has instructions for installing the Crossfire driver and video cards. I strongly suggest you read that, it is not long but has essential information. What worries me is the two different manufactures of the video cards. Yes they are the same basic model, R9 280X with the same memory capacity and interface, but the VBIOS (Video BIOS) of each card seems to be slightly different, and they seem to not be happy working together in Crossfire. I suggest asking about this in the AMD video forum, and/or PowerColor and Sapphire forums, about mixing different manufactures cards in Crossfire.

Wreekhavok Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Jun 2015 Status: Offline Points: 3	Post Options Post Reply Quote Wreekhavok Report Post Thanks(0) Quote Reply Posted: 05 Jun 2015 at 10:49pm
	So for the past 3 months ive been slowly upgrading my rig a piece at a time. My current specs are: ASRock Z77 Extreme4 I7 3770 8gb of DDR3 RAM Sentey 1000w 80plus Bronze Modular Power supply 1x PowerColor TurboDuo AXR9 280X 3GBD5-T2DHE/OC Radeon R9 280X 3GB 384-Bit GDDR5 PCI Express 3.0 HDCP 1 x SAPPHIRE Vapor-X 100363VX-3L Radeon R9 280X 3GB 384-Bit GDDR5 PCI Express 3.0 CrossFireX Support TRI-X WITH BOOST This issue im running into is When I connect both video cards and power on the system, it gets to the ASRock screen and power cycles. It just keeps doing it, I can only get into the UEFI BIOS and no matter what settings I change it will not boot to Windows. Both cards are recognized in the UEFI system manager. Primary graphics is set to PCI-Express. PCIE2 and 3 are set to AUTO. VT-D is enabled, I even tried raising the VTT voltage to over 1.2 and still no difference. The crossfire bridge is connected. I originally had at Z75 Pro3 and replaced it because of the same issue. I thought not having 2 PCI-E x16 slots was the issue, but now I just don?�t know. Both cards work when I only have one installed, in both PCIE2 and PCIE3 slots. I have also installed both cards and left one unpowered until Windows boots and then connected the power and the card works fine but will not show up in the hardware manager. I have uninstalled CCC and reinstalled multiple times, I have installed every driver I possible from the ASRock site for each mobo and still no luck.