just want to put an end to this. this deal has been on and off for the last 3 monthes now. i jumped on this in november last year when i first saw this at the same price w/ the rebate. they are khx3200ak2/1gr. i can confirm they are not good for overclocking, but they can do 410mhz on stock voltage @ 2-3-2-6-1t. no matter how much i increased the voltage (yes, i tried the ddr booster, too) and how much i relaxed the timing, they wouldn't go over 424hmz. so i ended up just running them @ 410mhz because there's no reason to run them on high voltage and super relaxed timing just to get a few more hmz. i have an a64 3000+ winnie paired w/ a gigabyte 939-ultra motherboard. so i can't speak for intel setups.
anyway, for $140, it's great deal. the value stuff costs just as much if not more. Even if i don't get the rebate, the $20 was still well spent on the cool blue ddr heat spreader.