You mean chips for the stock board? I've not come across an actual board replacement for the VLocity loader.
There is a thread in the loader forum that's whole purpose is discussing aftermarket chips for the VLocity, so you mi9ght want to have a read of that: -
Personally, I thought the best of the first generation of VLocity chips was the Gangstar. Did me just fine until the newer chips started appearing.
More recently, a wider number of chips have been released, with new features that weren't previously available - a second generation of chips if you will.
Of these, I personally liked the features found in the Nox Injector chip, and the Hyperdrive chip - the ability to change settings on the fly, wide variety of tension and speed settings, auto reverse unjamming, boost settings etc. I purchased the Hyperdrive chip, simply because they are based in Europe, and have been happy with it. The Nox chip would have been just as good though. I then came across info about the v2 Gangstar chip, and the feature set would have also suited my needs - just a matter of having come across the other two chips first before I found out that Gangstar had a new chip out. Considering how good the original was, I'm sure that the second version is also a top choice.
Those are the three that I would personally recommend - Gangstar v2, Nox Injector and Hyperdrive, in no particular order.