I have exactly the same problem - MB Asus P8Z77-V with bios updated to version 1205. Before updating Bios Memtest caught an error. After updating BIOS to the latest version, memtest didn't show anything wrong after 9 hours (4 passes) but Prime95 still fails in custom blend test with 90% ram used. I set an XMP profile in BIOS but it fails even with 1333MHz. This memory is on the QVL list so it is supposed to work with this MB...
First you are welcome to submit an RMA and we will be happy to replace them that is never a problem with our memory.
However the issue you posted could be any n umber of thinks that can cause it to fail in this manor. I would suggest we try and replace them under RMA and se if that solves the issue for you. But if you continue to have problems it way be some other issue. The fact they pass www.memtest.org
would suggest the memory is intact. And the latest BIOS for your MB does address Memory compatibility so it may be worth trying.
P8Z77-V DELUXE BIOS 1206
1.Improve Improve system stability.
2.Improve memory compatibility.
3.Enhance compatibility with some USB devices.