E7-8880v2 (the whole
E7v2 family) is compatible with all
C600 chipsets - C602, C602J, C604, C606, C608 - and with X79
"when supported by motherboard vendor's BIOS".
I honestly don't think your R4E X79 is compatible, but it wouldn't hurt to contact ASUS, get a proper official response (or maybe even a one-off custom BIOS) before ruling it out.
If R4E won't work then I think C606 and C608 are the best of your options (comparison
here). And ASUS doesn't offer any of these mobos now, I can't tell if they ever did.
So I think your best option for this CPU would be a Gigabyte GA-X79S-UP5-WIFI (rev1.1 or rev1.0) ... name implies X79 but descriptors say C606 and several internet sources confirm it should be compatible.
There are also many (many) Supermicro C606 mobos but they're a confusing lot, more than a dozen models with nearly identical part numbers and different regional compliance/brandings, all used (ebay/etc) these days, and you'd have to be careful to choose one with the correct CPU socket and DIMM slots, haha, good luck with that (you'll need it).
I couldn't find any X79 mobos which explicitly listed E7v2 compatibility. I couldn't find any C608 mobos at all.
That is a beast CPU - worth $5K or more (or at least it was, once) - if you can't match it with a compatible mobo then consider selling it ASAP to get a good price while you can.
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