Yeah, MW has never been that great for CUDA cards. ATI / AMD cards though - it was always good credits (when it was up).

OK, finally got a chance to look at this rig here. Busy day. Thanks for all the replies and suggestions.
I found the problem. Running Collatz, FreeHal, and WuProp on the 6 core CPU was hogging all the CPU and starving the GPU. Strange, since this never happened before, and especially with a "small" GPU like the 4870.
When I suspended Collatz on the CPU, the GPU % immediately jumps up to 97 or 98%. At 790MHz core clock, this is spitting out WUs in 2:23 now. Very nice, much like what I remember. For the record, they are the native ATI14 code WUs.

However, what did they change? So on Kat's rig, I will have to disable one CPU core from BOINC crunching just to feed a lowly 4870 GPU MW WUs?
That is lame. Anyone notice anything similar, and is there perhaps a setting somewhere that I can change to allow the GPU feeding to take precedence over the CPU WUs, or is this a new "feature" in MW that it uses higher % of the CPU now?