OC'ing two 8800GT in NON-SLI

Hi guys,
My first post here;)

I'm using my rig (as in sig) for F@H and every MHz counts, so both GPUs need to be overclocked as much as possible. Especially shaders clocks. The problem is that I've no access to second gpu settings (evga) via any oc'ing program (rivatuner, atitool etc.) - monitor is plugged into xfx. RivaTuner 2.22 can't enable driver-level hardware overclockig for second card :mad: with "detect now" or "reboot" option.

Sometimes I do play, so the cards are connected with the bridge (with SLI disabled in nvidia panel). I tried plugging the monitor in evga, but nothing happens (monitor stays in sleep mode - another question: why?). Swaping the cards in a slots is not an option for now - I will not disassemble WC loop for that.

Any clues??

Anybody?