Update:
Ok, did a little testing. For me, testing means changing clock, running 3dmark and seeing if any artifacts appear, then playing a game for a bit.
The ram is definately the limit. Right now I'm running stable at 325mhz. Anything much above 330mhz signs of memory corruption start to appear.
The core on the other hand, appears quite eager to be clocked. Right now I stopped at 380 with no hint of problems yet. I wouldn't at all be suprised if would go as high as the 9800 pro's overclock.
So my verdict: for being some $65 cheaper I'm more or less happy. But, I likely wouldn't be so if I had to run it at the very low shipping clock speeds. No gaurentees any other one will clock the same as this one, so if you've got the $65 it's probibly worth it for peace of mind.