Just tossing my confirmations out there:

Sapphire 5830s:

Pair 1:  264 Mhash/sec -> 271 Mhash/sec (each) at 875 MHz GPU, 900 MHz RAM (2.58% increase)
Pair 2:  273 Mhash/sec -> 281 Mhash/sec (each) at 900 MHz GPU, 600 MHz RAM (2.84% increase)

I'm also tracking Rejected shares.

Before Patch:
Pair 1:  ~2.6% rejects (after 800+ shares)
Pair 2:  ~3.2% rejects (after 800+ shares)

After Patch:
Pair 1:  ~3.0% rejects (after 650+ shares)
Pair 2:  ~4.0% (after 750+ shares)

So, the increase appears to also cause additional rejects that should be discounted from total increase gain, cutting it down a full 1% in my case.