Dual-wield frost tanking threat is effected by the weapon speed.

My weapons. I have two: Black Icicle, and I also have two Rimefang’s Claw. They’re not hard to get, just takes time.

Using my own gear (i232 average), the simulated difference is that those two slow dps weapons (always both with [Rune Of The Nerubian Carapace], for stamina), do ~13% more threat than fast/fast.

A slow/fast combo is 8% more threat than fast/fast.

Runeforges
With slow/fast, if you put fallen crusader (“FC”) on the fast off-hand, you get about 12% more threat than fast/fast, which is another nice middle-ground. FC is better than Razorice (“RI”).

With slow/slow, if you go fallen crusader main-hand and razorice on off-hand to max out threat, it’s a 6% threat gain over two Nerubians. Quite a lot.

Fast/fast with FC and RI, is 6% more than fast/fast Nerubian.

Presumes you’re still over 540 (or 535 defence for 5-mans) without Nerubian. I value stamina highly, so wouldn’t recommend DPS runeforges in a raid (unless it was Ulduar or something below your gear level).

Tabulated answers

Using i232 gear levels, for a 5-man tank. I include the absolute threat values from Kahorie’s sim (v1.202), then I indexed them to a baseline of the fast/fast, and put that index in brackets (it’s a percentage). Obviously, the damage difference is because of strike damage being higher with two slow weapons.

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