Haven't done it in a while, but it prob hasn't changed? Make a 4x Ardite Hammer (all 4 pieces Ardite) and they will stack, you will have Stonebound VIII on the hammer. It won't do anything until the durability drops. Use all the modfiers up by putting Redstone on the hammer to increase the speed. Then get the durability down as low as possible WITHOUT breaking the hammer... then add a modifier (gold block plus a diamond) and throw one of those RF capacitors on the hammer so you can recharge the durability using RF. You will now be the proud owner of the fastest hammer possible and charging it completely with RF will not change the speed of the tool. It will be permanent. The only drawback is that the RF will run out rather quickly, so I had four of these hammers at the ready, with a system for sending the "used up" hammers back to base to be recharged and sent back to me when done (via an EnderPouch).
Nowadays, it seems most packs don't even have the EnderPouch mod, so this technique may not work as well anymore. And if TiCo has changed anything since I used this method back in Monster modpack, then I do apologize and hope someone will correct my info.
I see DrowElf already said this, in fewer words.
I never read threads before I post. LOL