7950 will not overclock with more than 2 cards installed

[AmDD]

I'm actually mining litecoins before you ask why I'm still mining on GPUs.
I have 2 identical rigs that have been running for months with few issues. For some reason one will not allow my 7950s to overclock above the '2d clock speed' of like 150mhz core and 300mhz mem. I get no error or problems other than a very low hash speed.
Specs are 4 Sapphire 7950s per rig, cgminer on windows 7. 12.8 drivers

After messing with it some today it seems like as long as I only have 2 cards all is well (any 2 using any riser in any slot) but as soon as a third or fourth card is plugged in the extras will not overclock.

I asked this on the litecoin forum but there is more traffic here and I'm hoping for a better response.

Any ideas?

[AmDD]

DUH!

For some reason only had 2 cards listed in the config file.... I feel pretty dumb right now.

Disregard this thread.