Clarksdale's kludge of a memory controller makes me feel odd. I guess if you just want clockspeed and are willing to cool the hell out of your i3, you can stick some craptacular memory in there and run up the clocks knowing full well that your memory bandwidth and latency are going to be lousy anyway. Granted, DDR3-1600 5-5-5-18 isn't "craptacular", or even possible on most DIMMs, but I think you know what I mean; the benefit of shooting for that kind of memory speed will probably be lost on Clarksdale since it does much better than I thought it would given the gimped memory controller.
In the end, it's just another Intel chip that relies on solid cache architecture to overcome poor system memory performance just like the Core 2 Duos/Quads of old.
So, I can't say whether I would want an i3 530 over an Athlon II X4 620. The 620 has cheap board options, runs cheaper than any Clarksdale, and is known-good for about a 3.4 ghz overclock on the stock cooler. You can dump some extra cash on memory and exploit the IMC to try and make up for the weak/non-existent cache on the 620 as well.
Or you can spend more for the chip + mobo on an i3 (just what board do you want an i3 + discreet graphics with anyway? P55 or H57?), get cheap-ish RAM and then lap the hell out of the i3 and put a huge cooler on there and shoot for 4.5-4.8 ghz.
Also, it would be nice if Anandtech had OCed an i3 530 instead of the i5 that is so expensive that nobody in their right mind would buy it.