ASROCK 870 EXTREME 3 + 7870 LE issues

[madkind]

I wanted to merge two of my dual card rigs into a single rig.

The one with the asrock mobo perfectly works with 2x 7850 gpus, but wont even boot with 1  VTX3D 7870 tahiti le card (with or without the new risers). The 7870s perfectly worked in my ASUS P5K motherboard, but it has only 3 slots unfortunately.

I just can't understand how is it possible that a 1 month old gpu does not work in my ASROCK 870 EXTREME 3 R2 motherboard. I have the most recent bios flashed on it.

Anyone experienced something similiar?

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[pvtbrutus]

Try plugging it in directly on the board without other cards and no risers. And doublecheck the powerconnectors on the card.

[madkind]

Tried that already

[madkind]

It seems others could solve this problem by a mobo bios update, but I have the most recent one on my board, so its a no-go for me.